tdpeuter/2024CG-project-render
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name: CMake
on: [push]
env:
# Customize the CMake build type here (Release, Debug, RelWithDebInfo, etc.)
BUILD_TYPE: Release
jobs:
build:
# The CMake configure and build commands are platform agnostic and should work equally well on Windows or Mac.
# You can convert this to a matrix build if you need cross-platform coverage.
# See: https://docs.github.com/en/free-pro-team@latest/actions/learn-github-actions/managing-complex-workflows#using-a-build-matrix
runs-on: ${{ matrix.os }}
strategy:
matrix:
include:
- os: [self-hosted,Windows]
outputsuffix: win
archive_type: zip
archive_extension: zip
outputfile1: Release/normals.exe
outputfile2: Release/obj.exe
outputfile3: Release/quad_subdivision.exe
- os: [self-hosted,Linux]
outputsuffix: ux
archive_type: zip
archive_extension: zip
outputfile1: normals
outputfile2: obj
outputfile3: quad_subdivision
steps:
- uses: actions/checkout@v3
- name: Configure CMake
# Configure CMake in a 'build' subdirectory. `CMAKE_BUILD_TYPE` is only required if you are using a single-configuration generator such as make.
# See https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html?highlight=cmake_build_type
run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}}
- name: Build
# Build your program with the given configuration
run: |
cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}}
- name: Upload a Build Artifact
uses: actions/upload-artifact@v3.1.2
with:
# Artifact name
name: CG_${{ matrix.outputsuffix }}_${{env.BUILD_TYPE}}
# A file, directory or wildcard pattern that describes what to upload
path: |
${{github.workspace}}/build/${{matrix.outputfile1}}
${{github.workspace}}/build/${{matrix.outputfile2}}
${{github.workspace}}/build/${{matrix.outputfile3}}

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# Compiled Object files
*.slo
*.lo
*.o
# Precompiled Headers
*.gch
*.pch
# Compiled Dynamic libraries
*.so
*.dylib
*.dll
# Fortran module files
*.mod
*.smod
# Compiled Static libraries
*.lai
*.la
*.a
*.lib
# Executables
*.exe
*.out
*.app
# Visual Studio
.vs/*
out/*
CMakeSettings.json
*.un~
*.swo
*.swp
build/*
bin/*
*.DS_Store

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cmake_minimum_required(VERSION 3.0)
project(meshes)
set(CMAKE_CXX_STANDARD 11)
list(PREPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
# Libigl
include(libigl)
# Enable the target igl::glfw and igl::stb
igl_include(glfw)
igl_include(stb)
# include the header files
include_directories(include/)
# add the source files
file(GLOB SRCFILES src/*.cpp)
# create 1 library "core" (from the SRCFILES) and 3 projects/executables ("normals", "quad_subdivision", "obj")
add_library(core ${SRCFILES})
target_link_libraries(core PUBLIC igl::glfw)
add_executable(normals "normals.cpp")
target_link_libraries(normals PUBLIC core igl::glfw )
add_executable(quad_subdivision "quad_subdivision.cpp")
target_link_libraries(quad_subdivision PUBLIC core igl::glfw )
add_executable(obj "obj.cpp")
target_link_libraries(obj PUBLIC core igl::glfw igl::stb)

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# Computer Graphics Lab3 – Meshes
**Deadline: Nov. 15 2024, 22:00**
## Building using CMake
### Windows
If your CMake version < 3.16.0, you might see an error pop up while using CMake, saying that Libigl requires a version >= 3.16.0. If you don't want to update your CMake, simply go to the line throwing that error and change the version:
```
# on my machine the error is thrown in
# "out/build/x64-Debug/_deps/libigl-src/CMakeLists.txt" on line 12:
set(REQUIRED_CMAKE_VERSION "3.16.0")
# change this to a version <= your version, for example:
set(REQUIRED_CMAKE_VERSION "3.0.0")
```
### Linux
If CMake succeeds without errors, great. However, if not, then you will have to resolve the thrown exceptions. We follow [libigl's example project](https://github.com/libigl/libigl-example-project) in this assignment, which they claim should work on Ubuntu out of the box. It can be however that CMake throws exceptions that look like:
1. `"Could not find X11 (missing: X11_X11_LIB ...)"`
2. `"... headers not found; ... install ... development package"`
3. `"Could NOT find OpenGL (missing: OPENGL_opengl_LIBRARY ...)"`
To solve errors like this, install the missing packages (you might need to search around on the web if the following command does not suffice):
```
sudo apt install libx11-dev libxrandr-dev libxinerama-dev libxcursor-dev libxi-dev libgl1-mesa-dev
```
### WSL (Windows)
Follow the Linux instructions above. Warning: the assignment uses OpenGL and GLFW to create a window, which might not work with WSL. We will not be able to help you here.
### MacOS
We follow [libigl's example project](https://github.com/libigl/libigl-example-project) in this assignment, which they claim should work on MacOS out of the box. If you experience CMake errors that you cannot solve with some help online, please contact us.
## Background
### Read Section 12.1 of _Fundamentals of Computer Graphics (4th Edition)_.
### Skim read Chapter 11 of _Fundamentals of Computer Graphics (4th Edition)_.
There are many ways to store a triangle (or polygonal) mesh on the computer. The
data-structures have very different complexities in terms of code, memory, and
access performance. At the heart of these structures, is the problem of storing
the two types of information defining a mesh: the _geometry_ (where are points
on the surface located in space) and the _connectivity_ (which points are
connected to each other). The connectivity is also sometimes referred to as the
[topology](https://en.wikipedia.org/wiki/Topology) of the mesh.
The [graphics pipeline](https://en.wikipedia.org/wiki/Graphics_pipeline) works
on a per-triangle and per-vertex basis. So the simplest way to store geometry is
a 3D position <img src="/markdown/ec6276257da0cb44caa5ae4b07afb40e.svg?invert_in_darkmode&sanitize=true" align=middle width=56.27160494999998pt height=26.76175259999998pt/> for each <img src="/markdown/77a3b857d53fb44e33b53e4c8b68351a.svg?invert_in_darkmode&sanitize=true" align=middle width=5.663225699999989pt height=21.68300969999999pt/>-th vertex of the mesh. And to store
triangle connectivity as an ordered triplet of indices referencing vertices:
<img src="/markdown/567132d8a883ab35cbb45db628ebb96e.svg?invert_in_darkmode&sanitize=true" align=middle width=36.147533399999986pt height=22.831056599999986pt/> defines a triangle with corners at vertices <img src="/markdown/5474c8baa2bc6feabb0eac4237772aab.svg?invert_in_darkmode&sanitize=true" align=middle width=14.628015599999989pt height=14.611878600000017pt/>, <img src="/markdown/4e86697c693f7bd2ebcf1bf515fbba2f.svg?invert_in_darkmode&sanitize=true" align=middle width=16.08162434999999pt height=14.611878600000017pt/> and <img src="/markdown/fac5b28b95f69ccc2e9d37b26c68864f.svg?invert_in_darkmode&sanitize=true" align=middle width=17.24314514999999pt height=14.611878600000017pt/>.
Thus, the geometry is stored as a list of <img src="/markdown/55a049b8f161ae7cfeb0197d75aff967.svg?invert_in_darkmode&sanitize=true" align=middle width=9.86687624999999pt height=14.15524440000002pt/> 3D vectors: efficiently, we can
put these vectors in the rows of a real-valued matrix <img src="/markdown/907f9d3f474ec1dea25687fb39c395a7.svg?invert_in_darkmode&sanitize=true" align=middle width=73.77646979999999pt height=26.76175259999998pt/>. Likewise,
the connectivity is stored as a list of <img src="/markdown/0e51a2dede42189d77627c4d742822c3.svg?invert_in_darkmode&sanitize=true" align=middle width=14.433101099999991pt height=14.15524440000002pt/> triplets: efficiently, we can put
these triplets in the rows of an integer-valued matrix <img src="/markdown/c7299835acc0beb6d4c78f128f1d90cd.svg?invert_in_darkmode&sanitize=true" align=middle width=123.31228469999999pt height=26.76175259999998pt/>.
> **Question:** What if we want to store a (pure-)quad mesh?
### Texture Mapping
[Texture mapping](https://en.wikipedia.org/wiki/Texture_mapping) is a process
for mapping image information (e.g., colors) onto a surface (e.g., triangle
mesh). The standard way to define a texture mapping is to augment the 3D
geometric information of a mesh with additional 2D _parametrization_
information: where do we find each point on the texture image plane? Typically,
parameterization coordinates are bound to the unit square.
Mapping a 3D flat polygon to 2D is rather straightforward. The problem of
finding a good mapping from a 3D surface to 2D becomes much harder if our
surface is not flat (e.g., like a
[hemisphere](https://en.wikipedia.org/wiki/Hemisphere)), if the surface does not
have exact one boundary (e.g., like a sphere) or if the surface has "holes"
(e.g., like a [torus/doughnut](https://en.wikipedia.org/wiki/Torus)).
Curved surfaces must get _distorted_ when flattened onto the plane. This is why
[Greenland looks bigger than
Africa](https://www.youtube.com/watch?v=vVX-PrBRtTY) on a common map of the
Earth.
The lack or presence of too many boundaries or the presence of "doughnut holes"
in surfaces implies that we need to "cut" the surface to lay out it on the
plane so all parts of the surface are "face up". _Think about trying to flatten
a deflated basketball on the ground._
### Normals
For a smooth surface, knowing the surface geometry (i.e., position in space)
near a point fully determines the [normal
vector](https://en.wikipedia.org/wiki/Normal_(geometry)) at that point.
For a discrete mesh, the normal is only well-defined in the middle of planar
faces (e.g., inside the triangles of a triangle mesh, but not along the edges or
at vertices). Furthermore, if we use these normals for rendering, the surface
will have a faceted appearance. This appearance is mathematically correct, but
not necessarily desired if we wish to display a smooth looking surface.
[Phong](https://en.wikipedia.org/wiki/Bui_Tuong_Phong) realized that [linearly
interpolating](https://en.wikipedia.org/wiki/Linear_interpolation) normals
stored at the corners of each triangle leads to a [smooth
appearance](https://en.wikipedia.org/wiki/Phong_shading#Phong_interpolation).
This raises the question: what normals should we put at vertices or corners of
our mesh?
For a faceted surface (e.g., a cube), all corners of a planar face <img src="/markdown/190083ef7a1625fbc75f243cffb9c96d.svg?invert_in_darkmode&sanitize=true" align=middle width=9.81741584999999pt height=22.831056599999986pt/> should
share the face's normal <img src="/markdown/aa0f607fb8a0f302675de85aeabededc.svg?invert_in_darkmode&sanitize=true" align=middle width=59.845697999999985pt height=26.76175259999998pt/> .
For a smooth surface (e.g., a sphere), corners of triangles located at the same
vertex should share the same normal vector. This way the rendering is continuous
across the vertex. A common way to define per-vertex normals is to take a
weighted average of normals from incident faces. Different weighting schemes are
possible: uniform average (easy, but sensitive to irregular triangulations),
angle-weighted (geometrically well motivated, but not robust near zero-area
triangles), area-weighted (geometrically reasonable, well behaved). In this
assignment, we'll compute area-weighted per-vertex normals:
<p align="center"><img src="/markdown/599fe3b222b5898bd240d6ac12d5c5b5.svg?invert_in_darkmode&sanitize=true" align=middle width=161.40208425pt height=41.4976122pt/></p>
where <img src="/markdown/f947b3c602ca948910b99f1601e5abed.svg?invert_in_darkmode&sanitize=true" align=middle width=36.34324319999999pt height=24.65753399999998pt/> is the set of faces neighboring the <img src="/markdown/6c4adbc36120d62b98deef2a20d5d303.svg?invert_in_darkmode&sanitize=true" align=middle width=8.55786029999999pt height=14.15524440000002pt/>-th vertex.
![Unique triangle normals (orange) are well-defined. We can define a notion of a
normal for each vertex (purple) by taking a (weighted) average of normals from
incident triangles.](markdown/per-vertex-normal.png)
For surfaces with a mixture of smooth-looking parts and creases, it is useful to
define normals independently for each triangle corner (as opposed to each mesh
vertex). For each corner, we'll again compute an area-weighted average of normals
triangles incident on the shared vertex at this corner, but we'll ignore
triangle's whose normal is too different from the corner's face's normal:
<p align="center"><img src="/markdown/cc96dd182e07003c6232739259df10ec.svg?invert_in_darkmode&sanitize=true" align=middle width=245.6981736pt height=42.4291164pt/></p>
where <img src="/markdown/1926c401973f24b4db4f35dca2eb381d.svg?invert_in_darkmode&sanitize=true" align=middle width=6.672392099999992pt height=14.15524440000002pt/> is the minimum dot product between two face normals before we declare
there is a crease between them.
![`./normals` should open a viewing window. Toggling `1`,`2`,`3` should switch
between normal types. Notice that per-face has sharp corners, but a faceted
appearance in the curved regions; the per-vertex has nice smooth regions but
ugly corners where averaging acts up; and per-corner is the best of both
worlds.](markdown/fandisk-normals.png)
### .obj File Format
A common file format to save meshes is the [.obj file format](https://en.wikipedia.org/wiki/Wavefront_.obj_file), which contains a _face_-based representation. The connectivity/topological data is stored implicitly by a list of faces made out of vertices. Per vertex, three main types of geometric information can be stored:
- 3D position information of a vertex (denoted as `v` in the file, and `V` in the src code)
- 3D normal vector information of a vertex (`vn`, or `NV` in src code)
- 2D parameterization information (e.g. texture coordinate) of a vertex (`vt`, or `UV` in the src code)
Take a cube for example. You could construct a mesh with 6 faces, each having 1 normal vector, and 4 vertices per face. You could make it so that each vertex has a 2D texture coordinate.
![cube.png](markdown/cube.png)
In an .obj file, a face is defined as a list of indices pointing towards certain lines of `v`, `vt` and/or `vn`. For example :
```
v 0.0 0.0 0.0 # 3D position 1
v 2.0 0.0 0.0 # 2
v 1.0 2.0 0.0 # 3
vt 0.0 0.0 # 2D texture coordinate 1
vt 1.0 0.0 # 2
vt 0.5 1.0 # 3
vn 0.0 0.0 1.0 # 3D normal vector 1
# some examples faces that can be made:
f 1 2 3 # face 1: a face made of 3 vertices, with 3D positions 1,2,3
f 1/1 2/2 3/3 # face 2: same as face 1, but with 2D texture coordinates 1,2,3 respectively
f 1//1 2//1 3//1 # face 3: same as face 1, but with normal vector 1 for each vertex
f 1/1/1 2/2/1 3/3/1 # face 4: each vertex has a position, texture coordinate and normal vector
```
> **Warning:** In an .obj file, indexing always starts at `1`, not `0`!
This is just an example of course. Faces can have more than 3 vertices, can have vertices with different normal vectors, and the order of faces does not matter.
### Subdivision Surfaces
A [subdivision surface](https://en.wikipedia.org/wiki/Subdivision_surface) is a
natural generalization of a [spline
curve](https://en.wikipedia.org/wiki/Spline_(mathematics)). A smooth spline can
be defined as the [limit](https://en.wikipedia.org/wiki/Limit_(mathematics)) of
a [recursive
process](https://en.wikipedia.org/wiki/Recursion_(computer_science)) applied to
a polygon: each edge of the polygon is split with a new vertex and the vertices
are smoothed toward eachother. If you've drawn smooth curves using Adobe
Illustrator, PowerPoint or Inkscape, then you've used splines.
At a high-level, subdivision surfaces work the same way. We start with a
polyhedral mesh and subdivide each face. This adds new vertices on the faces
and/or edges of the mesh. Then we smooth vertices toward each other.
The first and still (most) popular subdivision scheme was invented by
[Catmull](https://en.wikipedia.org/wiki/Edwin_Catmull) (who went on to co-found
[Pixar](https://en.wikipedia.org/wiki/Pixar)) and
[Clark](https://en.wikipedia.org/wiki/James_H._Clark) (founder of
[Silicon Graphics](https://en.wikipedia.org/wiki/Silicon_Graphics) and
[Netscape](https://en.wikipedia.org/wiki/Netscape)). [Catmull-Clark
subdivision](https://en.wikipedia.org/wiki/Catmull–Clark_subdivision_surface) is
defined for inputs meshes with arbitrary polygonal faces (triangles, quads,
pentagons, etc.) but always produces a pure-quad mesh as output (i.e., all faces
have 4 sides).
To keep things simple, in this assignment we'll assume the input is also a
pure-quad mesh.
![Running `./quad_subdivision` and repeated pressing _space_ will show this
[Bob](http://www.cs.cmu.edu/~kmcrane/Projects/ModelRepository/#bob) converging
toward a smooth surface.](markdown/bob-subdivision.gif)
## Mesh Viewers
(Optional) In this assignment, you will create meshes that you can save to an .obj file thanks to `write_obj.cpp`. If you would like to view these meshes in something other than the `libigl` viewer we provide, you can open the .obj files in:
1. [Mesh Lab](http://www.meshlab.net) free, open-source. **_Warning_:** Mesh Lab does not appear
to respect user-provided normals in .obj files.
2. [Blender](https://www.blender.org/download/): free, open-source. If you want to see the texture, you will have to make a shader with an image texture.
3. [Autodesk Maya](https://en.wikipedia.org/wiki/Autodesk_Maya) is a commericial 3D
modeling and animation software. They often have [free student versions](https://www.autodesk.com/education/free-software/maya).
## Almost ready to start implementing
### Eigen Matrices
This assignment use the Eigen library. This section contains some useful syntax:
```
Eigen::MatrixXi A; // creates a 0x0 matrix of integers
A.resize(10, 3); // resizes the matrix to 10x3 (meaning 10 rows, 3 columns)
Eigen::MatrixXd B; // creates a 0x0 matrix of doubles
B.resize(10, 3); // important, always use resize() !
Eigen::MatrixXd C = Eigen::MatrixXd::Zero(10, 3); // here C.resize() is not necessary
C.row(0) = Eigen::RowVector3d(0, 0, 1); // overwrite the first row of C
C.row(5); // gives the 5th row of C, as an Eigen::RowVectorXd
C(5,0); // gives the element on row=5 and column=0 of C
```
### White list
You're encouraged to use `#include <Eigen/Geometry>` to compute the [cross
product](https://en.wikipedia.org/wiki/Cross_product) of two 3D vectors
`.cross`.
### Black list
This assignment uses [libigl](http://libigl.github.io) for mesh viewing. libigl
has many mesh processing functions implemented in C++, including some of the
functions assigned here. Do not copy or look at the following implementations:
`igl::per_vertex_normals`
`igl::per_face_normals`
`igl::per_corner_normals`
`igl::double_area`
`igl::vertex_triangle_adjacency`
`igl::writeOBJ`
# Tasks
## Part 1: Understanding the .OBJ File Format
Once you have implemented the files below, run
```
Linux: ./obj ../data/rubiks-cube.png ../data/earth-square.png
Windows: obj.exe ../../../data/rubiks-cube.png ../../../data/earth-square.png
```
to open a window showing your cube being rendered. If you press 'Escape', it will close and the second window displaying your sphere will pop up. They should look like this:
![Running `./obj` will first pop up a viewer with your generated cube textured
with a [Rubik's
cube](https://en.wikipedia.org/wiki/Rubik%27s_Cube)](markdown/rubiks-cube.gif)
![After closing that window, another viewer will pop up with your generated sphere textured
with the earth.](markdown/earth.gif)
> Tip: look at the **header file** of each function to implement.
### `src/write_obj.cpp`
The input is a mesh with
1. 3D vertex positions (`V`)
2. 2D parametrization positions (`UV`)
3. 3D normal vectors (`NV`)
4. the vertices making up the faces (`F`), denoted as indices of `V`
5. the uvs of the faces (`UF`), denoted as indices of `UV`
5. the normal vectors of the faces (`UF`), denoted as indices of `NV`
The goal is to write the mesh to an `.obj` file.
> **Note:** This assignment covers only a small subset of meshes and mesh-data that the `.obj` file format supports.
### `src/cube.cpp`
Construct the **quad** mesh of a cube including parameterization and per-face
normals.
> **Hint:** Draw out on paper and _label_ with indices the 3D cube, the 2D
> parameterized cube, and the normals.
### `src/sphere.cpp` (optional, not included in rating)
Construct a **quad** mesh of a sphere with `num_faces_u` × `num_faces_v` faces. Take a look at UV spheres or [equirectangular projection/mapping](https://www.youtube.com/watch?v=15dVTZg0rhE).
The equirectangular projection basically defines how a 3D vertex `(x,y,z)` on the sphere is mapped to a 2D texture coordinate `(u,v)`, and vice versa. To go from `(u,v)` to `(x,y,z)` (although some flipping of axes might be necessary):
```
φ = 2π - 2πu # φ is horizontal and should go from 2π to 0 as u goes from 0 to 1
θ = π - πv # θ is vertical and should go from π to 0 as v goes from 0 to 1
x = sin(θ)cos(φ)
y = cos(θ)
z = sin(θ)sin(φ)
```
> **Note**: The `v` axis of the texture coordinate is always upwards
## Part 2: Calculating normal vectors
You may assume that the input .obj files will all contain faces with 3 vertices (triangles), like `fandisk.obj`. Once you have implemented the functions below, run
```
Linux: ./normals ../data/fandisk.obj
Windows: normals.exe ../../../data/fandisk.obj
```
to open a window showing the fandisk being rendered using the normals calculated by you. Type '1', '2' or '3' (above qwerty/azerty on the keyboard) to switch between per-face, per-vertex and per-corner normals. The difference between per-face and per-corner is only visible when zoomed in.
![fandisk.gif](markdown/fandisk.gif)
> Tip: look at the **header file** of each function to implement.
### `src/triangle_area_normal.cpp`
Compute the normal vector of a 3D triangle given its corner locations. The
output vector should have length equal to the area of the triangle.
**Important**: this the only time where you are allowed to return normal vectors that do not have unit length (i.e. that have not been normalized).
### `src/per_face_normals.cpp`
Compute per-face normals for a triangle mesh. In other words: for each face, compute the normal vector **of unit length**.
### `src/per_vertex_normals.cpp`
Compute per-vertex normals for a triangle mesh. In other words: for each vertex, compute the normal vector **of unit length**, by taking a area-weighted average over the normals of all the faces with that vertex as a corner.
### `src/vertex_triangle_adjacency.cpp`
Compute a vertex-triangle adjacency list. For each vertex store a list of all incident faces. Tip: `emplace_back()`.
### `src/per_corner_normals.cpp`
Compute per-corner normals for a triangle mesh. The goal is to compute a **unit** normal vector for each corner C of each face F. This is done by taking the area-weighted average of normals of faces connected to C. However, an incident face's normals is only included in the area-weighted average if the angle between that face normal and that of F is smaller than a threshold (`corner_threshold` (= 20 degrees)).
## Part 3: Implementing a mesh subdivision method
### `src/catmull_clark.cpp`
Conduct `num_iters` iterations of [Catmull-Clark
subdivision](https://en.wikipedia.org/wiki/Catmull–Clark_subdivision_surface) on
a **pure quad** mesh (`V`,`F`).
Once this is implemented, run `./quad_subdivision` (or `quad_subdivision.exe`) on your `cube.obj` or `bob.obj` (shown earlier). Press 'spacebar' to subdivide once. It should look nicely smooth and uniform from all sides:
![subdivide_cube.gif](markdown/subdivide_cube.gif)
> Tip: First get cube.obj working before moving onto bob.obj.
> Tip: I think the step-by-step explanation on [Wikipedia (under "Recursive evaluation")](https://en.wikipedia.org/wiki/Catmull%E2%80%93Clark_subdivision_surface) is quite clear.
> Tip: **perform the Catmull-Clark algorithm on paper first**, i.e. draw the cube from cube.obj on a piece of paper and manually calculate each `face point`, `edge point` and `new vertex point`. Check if these values are the same as your implementation.

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if(TARGET igl::core)
return()
endif()
include(FetchContent)
FetchContent_Declare(
libigl
GIT_REPOSITORY https://github.com/libigl/libigl.git
GIT_TAG v2.5.0
)
FetchContent_MakeAvailable(libigl)

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data/torus.obj Normal file
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# This file uses centimeters as units for non-parametric coordinates.
v -2.000000 0.000000 0.000000
v -3.000000 0.000000 -1.000000
v -4.000000 0.000000 -0.000001
v -3.000000 0.000000 1.000000
v -1.000000 -1.732050 0.000000
v -1.500000 -2.598080 -1.000000
v -2.000000 -3.464100 -0.000001
v -1.500000 -2.598080 1.000000
v 1.000000 -1.732050 0.000000
v 1.500000 -2.598080 -1.000000
v 2.000000 -3.464100 -0.000001
v 1.500000 -2.598080 1.000000
v 2.000000 0.000000 0.000000
v 3.000000 0.000000 -1.000000
v 4.000000 0.000000 -0.000001
v 3.000000 0.000000 1.000000
v 1.000000 1.732050 0.000000
v 1.500000 2.598080 -1.000000
v 2.000000 3.464100 -0.000001
v 1.500000 2.598080 1.000000
v -1.000000 1.732050 0.000000
v -1.500000 2.598080 -1.000000
v -2.000000 3.464100 -0.000001
v -1.500000 2.598080 1.000000
f 6 2 1 5
f 7 3 2 6
f 8 4 3 7
f 5 1 4 8
f 10 6 5 9
f 11 7 6 10
f 12 8 7 11
f 9 5 8 12
f 14 10 9 13
f 15 11 10 14
f 16 12 11 15
f 13 9 12 16
f 18 14 13 17
f 19 15 14 18
f 20 16 15 19
f 17 13 16 20
f 22 18 17 21
f 23 19 18 22
f 24 20 19 23
f 21 17 20 24
f 2 22 21 1
f 3 23 22 2
f 4 24 23 3
f 1 21 24 4

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#ifndef QUADVIEWER_H
#define QUADVIEWER_H
#include <igl/opengl/glfw/Viewer.h>
#include <Eigen/Core>
#include <cassert>
#include <string>
class QuadViewer
{
public:
igl::opengl::glfw::Viewer viewer;
std::function<bool(igl::opengl::glfw::Viewer& viewer, unsigned int key, int modifiers)> callback_key_pressed;
bool show_lines;
public:
QuadViewer():show_lines(true),
// Important to initialize function
callback_key_pressed([](igl::opengl::glfw::Viewer& viewer, unsigned int key, int modifiers)->bool{return false;})
{
std::cout<<R"(QuadViewer usage:
F,f [disabled]
L,l Show/hide quad eges
U,u Show/hide texture
)";
viewer.data().show_lines = false;
viewer.callback_key_pressed = [this](
igl::opengl::glfw::Viewer & /*viewer*/,
unsigned int key,
int modifier)->bool
{
if(!callback_key_pressed(viewer,key,modifier))
{
switch(key)
{
default:
return false;
case 'F':
case 'f':
// Disable Toggling "face based" since we want control of quad-mesh
// appearance
break;
case 'L':
case 'l':
// Usurp the Toggling "show lines" and map to showing overlay instead
show_lines = !show_lines;
viewer.data().show_overlay = show_lines;
break;
case 'U':
case 'u':
viewer.data().show_texture = !viewer.data().show_texture;
break;
}
}
return true;
};
}
// Set the mesh of .data() to be an exploded version of the given quad mesh
//
// Inputs:
// V #V by 3 mesh vertex positions
// F #F by 4 quad indices into V
void set_mesh(
const Eigen::MatrixXd & V,
const Eigen::MatrixXd & UV,
const Eigen::MatrixXd & NV,
const Eigen::MatrixXi & F)
{
assert((UV.rows() == 0 || V.rows() == UV.rows()) && "V and UV should have same #rows");
assert((NV.rows() == 0 || V.rows() == NV.rows()) && "V and NV should have same #rows");
// libigl Viewer does not handle quad meshes well by default
// Explode the quad mesh into quad soup. Then each quad can have smooth
// normals: faceted-quad appearance
Eigen::MatrixXd FV(F.rows()*4,V.cols());
Eigen::MatrixXd FUV,FNV;
if(UV.rows() != 0) FUV.resize(F.rows()*4,UV.cols());
if(NV.rows() != 0) FNV.resize(F.rows()*4,NV.cols());
Eigen::MatrixXi FF(F.rows(),4);
for(int f = 0;f<F.rows();f++)
{
for(int c = 0;c<4;c++)
{
FF(f,c) = c+f*4;
FV.row(FF(f,c)) = V.row(F(f,c));
if(UV.rows() != 0) FUV.row(FF(f,c)) = UV.row(F(f,c));
if(NV.rows() != 0) FNV.row(FF(f,c)) = NV.row(F(f,c));
}
}
Eigen::MatrixXi T(FF.rows()*2,3);
T<<
FF.col(0), FF.col(1), FF.col(2),
FF.col(0), FF.col(2), FF.col(3);
viewer.data().clear();
viewer.data().set_mesh(FV,T);
if(NV.rows() != 0) viewer.data().set_normals(FNV);
if(UV.rows() != 0) viewer.data().set_uv(FUV);
viewer.data().set_face_based(false);
Eigen::MatrixXi E(FF.rows()*4,2);
E<<
FF.col(0), FF.col(1),
FF.col(1), FF.col(2),
FF.col(2), FF.col(3),
FF.col(3), FF.col(0);
viewer.data().set_edges(FV,E,Eigen::RowVector3d(0,0,0));
}
// Wrapper without UV and NV
void set_mesh(
const Eigen::MatrixXd & V,
const Eigen::MatrixXi & F)
{
return set_mesh(V,Eigen::MatrixXd(),Eigen::MatrixXd(),F);
}
// Explode all data to be per-corner so libigl viewer can handle it.
void set_mesh(
const Eigen::MatrixXd & V,
const Eigen::MatrixXi & F,
const Eigen::MatrixXd & UV,
const Eigen::MatrixXi & UF,
const Eigen::MatrixXd & NV,
const Eigen::MatrixXi & NF)
{
Eigen::MatrixXd vV(F.rows()*F.cols(),V.cols());
Eigen::MatrixXd vUV(F.rows()*F.cols(),UV.cols());
Eigen::MatrixXd vNV(F.rows()*F.cols(),NV.cols());
Eigen::MatrixXi vF(F.rows(),F.cols());
for(int f = 0;f<F.rows();f++)
{
for(int c = 0;c<F.cols();c++)
{
const int vi = f*F.cols()+c;
vV.row(vi) = V.row(F(f,c));
vUV.row(vi) = UV.row(UF(f,c));
vNV.row(vi) = NV.row(NF(f,c));
vF(f,c) = vi;
}
}
set_mesh(vV,vUV,vNV,vF);
}
// Pass through to igl::opengl::glfw::Viewer::launch
int launch(bool fullscreen = false)
{ return viewer.launch(fullscreen); }
};
#endif

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#ifndef CATMULL_CLARK_H
#define CATMULL_CLARK_H
#include <Eigen/Core>
// Conduct num_iters iterations of Catmull-Clark subdivision on a **pure quad**
// mesh (V,F).
//
// Inputs:
// V #V by 3 list of vertex positions
// F #F by 4 list of quad mesh indices into V
// num_iters number of iterations
// Outputs:
// SV #SV by 3 list of vertex positions
// SF #SF by 4 list of quad mesh indices into SV
//
void catmull_clark(
const Eigen::MatrixXd & V,
const Eigen::MatrixXi & F,
const int num_iters,
Eigen::MatrixXd & SV,
Eigen::MatrixXi & SF);
#endif

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include/cube.h Normal file
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#ifndef CUBE_H
#define CUBE_H
#include <Eigen/Core>
// Construct the quad mesh of a cube.
//
// Outputs:
// V 8 by 3 list of 3D corner vertex positions
// F 6 by 4 list of quad face indices into rows of V
// UV 14 by 2 list of corner parameterization positions
// UF 6 by 4 list of quad face indices into rows of UV
// NV 6 by 3 list of 3D unit normal vectors
// NF 6 by 4 list of quad face indices into rows of NV
void cube(
Eigen::MatrixXd & V,
Eigen::MatrixXi & F,
Eigen::MatrixXd & UV,
Eigen::MatrixXi & UF,
Eigen::MatrixXd & NV,
Eigen::MatrixXi & NF);
#endif

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include/per_corner_normals.h Normal file
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#ifndef PER_CORNER_NORMALS_H
#define PER_CORNER_NORMALS_H
#include <Eigen/Core>
// Compute per corner normals for a triangle mesh by computing the area-weighted
// average of normals at incident faces whose normals deviate less than the
// provided threshold.
//
// Inputs:
// V #V by 3 list of vertex positions
// F #F by 3 list of mesh triangle indices into V
// corner_threshold threshold in degrees on sharp angles
// Outputs:
// N #F*3 by 3 list of mesh vertex 3D normals, where the normal
// for corner F(i,j) is at N.row(i*3+j)
void per_corner_normals(
const Eigen::MatrixXd & V,
const Eigen::MatrixXi & F,
const double corner_threshold,
Eigen::MatrixXd & N);
#endif

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include/per_face_normals.h Normal file
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#ifndef PER_FACE_NORMALS_H
#define PER_FACE_NORMALS_H
#include <Eigen/Core>
// Compute per-face normals for a triangle mesh
//
// Inputs:
// V #V by 3 list of vertex positions
// F #F by 3 list of mesh triangle indices into V
// Outputs:
// N #F by 3 list of per-face unit normal vectors
void per_face_normals(
const Eigen::MatrixXd & V,
const Eigen::MatrixXi & F,
Eigen::MatrixXd & N);
#endif

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include/per_vertex_normals.h Normal file
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#ifndef PER_VERTEX_NORMALS_H
#define PER_VERTEX_NORMALS_H
#include <Eigen/Core>
// Compute per vertex normals for a triangle mesh by computing the area-weighted
// average of normals at incident faces.
//
// Inputs:
// V #V by 3 list of vertex positions
// F #F by 3 list of mesh triangle indices into V
// Outputs:
// N #V by 3 list of per-face unit normal vectors
void per_vertex_normals(
const Eigen::MatrixXd & V,
const Eigen::MatrixXi & F,
Eigen::MatrixXd & N);
#endif

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include/set_texture_from_png.h Normal file
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#ifndef SET_TEXTURE_FROM_PNG_H
#define SET_TEXTURE_FROM_PNG_H
#include <igl/opengl/ViewerData.h>
//#include <igl/png/texture_from_png.h>
#include <igl/stb/read_image.h>
#include <Eigen/Core>
#include <string>
// Read and set texture from a file (basically wrap up
// igl::png::texture_from_png because it's behaving very strangely
//
// Inputs:
// path path to .png file
// data ViewerData (e.g., returned from viewer.data())
// Returns true if file read succeeds
// Side effects:
// sets data uniform colors to white, show_texture to true, and texture colors
// to contents of file (ignoring alpha)
bool set_texture_from_png(const std::string & path,
igl::opengl::ViewerData & data)
{
Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic> R,G,B,A;
// what in the world is going on with igl::png::texture_from_png
//if(!igl::png::texture_from_png(path,R,G,B,A))
if(!igl::stb::read_image(path, R, G, B, A))
{
return false;
}
//R = R.colwise().reverse().eval();
//G = G.colwise().reverse().eval();
//B = B.colwise().reverse().eval();
// No alpha igl::png::texture_from_png seems confused...
A.setConstant(255);
data.set_texture(R,G,B,A);
const Eigen::Vector3d w(1,1,1);
data.uniform_colors( w*0.1,w,w);
data.show_texture = true;
return true;
}
#endif

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include/sphere.h Normal file
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#ifndef SPHERE_H
#define SPHERE_H
#include <Eigen/Core>
// Construct a quad mesh of a sphere wth num_faces_u × num_faces_v faces
// using a latitude-longitude Mercator parameterization.
//
// Inputs:
// num_faces_u number of faces in the longitudinal direction
// num_faces_v number of faces in the latitudinal direction
// Outputs:
// V #V by 3 list of 3D corner vertex positions
// F #F by 4 list of quad face indices into rows of V
// UV #UV by 2 list of corner parameterization positions
// UF #F by 4 list of quad face indices into rows of UV
// NV #NV by 3 list of 3D unit normal vectors
// NF #F by 4 list of quad face indices into rows of NV
void sphere(
const int num_faces_u,
const int num_faces_v,
Eigen::MatrixXd & V,
Eigen::MatrixXi & F,
Eigen::MatrixXd & UV,
Eigen::MatrixXi & UF,
Eigen::MatrixXd & NV,
Eigen::MatrixXi & NF);
#endif

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include/triangle_area_normal.h Normal file
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#ifndef TRIANGLE_AREA_NORMAL_H
#define TRIANGLE_AREA_NORMAL_H
#include <Eigen/Core>
// Compute the normal vector of a 3D triangle given its corner locations. The
// output vector should have length equal to the area of the triangle.
//
// Inputs:
// a 3D position of the first corner as a **row vector**
// b 3D position of the second corner as a **row vector**
// c 3D position of the third corner as a **row vector**
// Returns the area normal of the triangle as a 3D row vector
Eigen::RowVector3d triangle_area_normal(
const Eigen::RowVector3d & a,
const Eigen::RowVector3d & b,
const Eigen::RowVector3d & c);
#endif

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include/vertex_triangle_adjacency.h Normal file
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#ifndef VERTEX_TRIANGLE_ADJACENCY_H
#define VERTEX_TRIANGLE_ADJACENCY_H
#include <Eigen/Core>
#include <vector>
// Compute a vertex-triangle adjacency list. For each vertex store a list of all
// incident faces.
//
// Inputs:
// F #F by 3 list of mesh triangle indices
// num_vertices number of vertices (i.e., V.rows(); usually ==F.maxCoeff()+1)
// Outputs:
// VF num_verticess-long list of lists so that f=VF[i][j] means that face f
// is the jth face among those incident on vertex i. Adjacency faces are
// listed in no particular order (but no duplicates).
void vertex_triangle_adjacency(
const Eigen::MatrixXi & F,
const int num_vertices,
std::vector<std::vector<int> > & VF);
#endif

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#ifndef WRITE_OBJ_H
#define WRITE_OBJ_H
#include <Eigen/Core>
#include <string>
// Write a triangle or quad mesh to a .obj file
//
// Inputs:
// filename path to .obj file
// V #V by 3 list of vertex positions
// F #F by poly=(3 or 4) list of mesh face indices into V
// UV #UV by 2 list of UV positions
// UF #F by poly list of mesh face indices into UV
// NV #NV by 3 list of normal vectors
// NF #F by poly list of mesh face indices into NV
// Returns true if write was successful
bool write_obj(
const std::string & filename,
const Eigen::MatrixXd & V,
const Eigen::MatrixXi & F,
const Eigen::MatrixXd & UV,
const Eigen::MatrixXi & UF,
const Eigen::MatrixXd & NV,
const Eigen::MatrixXi & NF);
#endif

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css: markdown/github-markdown.css
html header: <link rel="stylesheet" href="markdown/github-markdown.css">
<style>
.markdown-body {
box-sizing: border-box;
min-width: 200px;
max-width: 980px;
margin: 0 auto;
padding: 45px;
}
@media (max-width: 767px) {
.markdown-body {
padding: 15px;
}
}
</style>
<article class="markdown-body">
<script type="text/x-mathjax-config">
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<div style="display:none">
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#include "per_vertex_normals.h"
#include "per_corner_normals.h"
#include "per_face_normals.h"
#include <igl/read_triangle_mesh.h>
#include <igl/opengl/glfw/Viewer.h>
int main(int argc, char * argv[])
{
// parse command line arguments
std::string path_to_obj;
if (argc == 2) {
std::string args = argv[1];
// check if ends with .obj
if (args.size() > 4 && args.substr(args.size() - 3, 3) == "obj") {
path_to_obj = args;
}
}
if (argc != 2 || path_to_obj.empty()) {
printf(
"Error: received unexpected command line arguments. \n"
"Correct usage: \n"
" Linux: ./normals <path to obj file> \n"
" Windows: normals.exe <path to obj file> \n"
"For example: \n"
" Linux: ./normals ../data/cube.obj \n"
" Windows: normals.exe ../../../data/cube.obj \n"
);
return -1;
}
Eigen::MatrixXd V;
Eigen::MatrixXi F;
igl::read_triangle_mesh(path_to_obj,V,F);
Eigen::MatrixXd VN,FN,CN;
// Compute different types of normals
per_face_normals(V,F,FN);
per_vertex_normals(V,F,VN);
per_corner_normals(V,F,20,CN);
// Set up and launch a little mesh viewer
igl::opengl::glfw::Viewer v;
v.data().set_mesh(V,F);
v.data().set_normals(VN);
// Keyboard interaction handling
v.callback_key_down = [&VN,&FN,&CN](
igl::opengl::glfw::Viewer & v,
unsigned char key,
int /*modifier*/
)->bool
{
switch(key)
{
default:
return false;
case '1':
v.data().set_normals(FN);
break;
case '2':
// viewer is weird and need to convince it out of CN mode
v.data().set_normals(FN);
v.data().set_normals(VN);
break;
case '3':
v.data().set_normals(CN);
break;
}
return true;
};
std::cout<< R"(
1 Use per-face normals
2 Use per-vertex normals
3 Use per-corner normals
)";
v.launch();
}

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#include "cube.h"
#include "sphere.h"
#include "write_obj.h"
#include "QuadViewer.h"
#include "set_texture_from_png.h"
#include <igl/readOBJ.h>
#include <Eigen/Core>
#include <vector>
#include <iostream>
#include <memory>
#include <limits>
#include <functional>
int main(int argc, char * argv[])
{
// parse command line arguments
std::string path_to_cube_png;
std::string path_to_earth_png;
if (argc == 3) {
std::string args0 = argv[1];
std::string args1 = argv[2];
// check if ends with .png
if (args0.size() > 4 && args0.substr(args0.size() - 3, 3) == "png") {
path_to_cube_png = args0;
}
if (args1.size() > 4 && args1.substr(args1.size() - 3, 3) == "png") {
path_to_earth_png = args1;
}
}
if (argc != 3 || path_to_cube_png.empty() || path_to_earth_png.empty()) {
printf(
"Error: received unexpected command line arguments. \n"
"Correct usage: \n"
" Linux: ./obj <path to rubiks-cube.png> <path to earth-square.png>\n"
" Windows: obj.exe <path to rubiks-cube.png> <path to earth-square.png> \n"
"For example: \n"
" Linux: ./obj ../data/rubiks-cube.png ../data/earth-square.png \n"
" Windows: obj.exe ../../../data/rubiks-cube.png ../../../data/earth-square.png \n"
);
return -1;
}
{
// Create mesh of a cube
Eigen::MatrixXd V,UV,NV;
Eigen::MatrixXi F,UF,NF;
cube(V,F,UV,UF,NV,NF);
write_obj("cube.obj",V,F,UV,UF,NV,NF);
printf("wrote to cube.obj \n");
igl::readOBJ("cube.obj",V,UV,NV,F,UF,NF);
{
QuadViewer v;
v.set_mesh(V,F,UV,UF,NV,NF);
set_texture_from_png(path_to_cube_png, v.viewer.data());
v.launch();
}
}
{
// Create mesh of a sphere
Eigen::MatrixXd V,UV,NV;
Eigen::MatrixXi F,UF,NF;
sphere(60,40,V,F,UV,UF,NV,NF);
write_obj("sphere.obj",V,F,UV,UF,NV,NF);
printf("wrote to sphere.obj \n");
igl::readOBJ("sphere.obj",V,UV,NV,F,UF,NF);
{
QuadViewer v;
v.set_mesh(V,F,UV,UF,NV,NF);
set_texture_from_png(path_to_earth_png, v.viewer.data());
v.launch();
}
}
}

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#include "catmull_clark.h"
#include "QuadViewer.h"
#include <igl/readOBJ.h>
//#include <igl/opengl/glfw/Viewer.h>
int main(int argc, char * argv[])
{
// parse command line arguments
std::string path_to_obj;
if (argc == 2) {
std::string args = argv[1];
// check if ends with .obj
if (args.size() > 4 && args.substr(args.size() - 3, 3) == "obj") {
path_to_obj = args;
}
}
if (argc != 2 || path_to_obj.empty()) {
printf(
"Error: received unexpected command line arguments. \n"
"Correct usage: \n"
" Linux: ./quad_subdivision <path to obj file> \n"
" Windows: quad_subdivision.exe <path to obj file> \n"
"For example: \n"
" Linux: ./quad_subdivision ../data/cube.obj \n"
" Windows: quad_subdivision.exe ../../../data/cube.obj \n"
);
return -1;
}
Eigen::MatrixXd V;
Eigen::MatrixXi F;
igl::readOBJ(path_to_obj,V,F);
if(F.cols() != 4 || F.minCoeff()<0)
{
std::cerr<<"Error: only pure quad meshes supported."<<std::endl;
return EXIT_FAILURE;
}
// Remember original mesh
Eigen::MatrixXd OV = V;
Eigen::MatrixXi OF = F;
bool show_lines = true;
QuadViewer v;
std::cout<<R"(Usage:
[space] apply Catmull-Clark subdivision
3 apply Catmull-Clark subdivision 3 times
R,r Reset to original mesh
)";
v.set_mesh(V,F);
v.callback_key_pressed = [&v,&V,&F,&OV,&OF,&show_lines](
igl::opengl::glfw::Viewer & /*viewer*/,
unsigned int key,
int /*modifier*/
)->bool
{
switch(key)
{
default:
return false;
case 'R':
case 'r':
// reset to input mesh
V = OV;
F = OF;
v.set_mesh(V,F);
break;
case '3':
// carry out three subdivisions
catmull_clark(Eigen::MatrixXd(V),Eigen::MatrixXi(F),3,V,F);
v.set_mesh(V,F);
break;
case ' ':
// carry out one subdivision
catmull_clark(Eigen::MatrixXd(V),Eigen::MatrixXi(F),1,V,F);
v.set_mesh(V,F);
break;
}
return true;
};
v.launch();
}

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#include "catmull_clark.h"
#include <unordered_map>
#include <utility>
#include <functional>
void catmull_clark(
const Eigen::MatrixXd & V,
const Eigen::MatrixXi & F,
const int num_iters,
Eigen::MatrixXd & SV,
Eigen::MatrixXi & SF)
{
////////////////////////////////////////////////////////////////////////////
// Replace with your code here:
SV = V;
SF = F;
////////////////////////////////////////////////////////////////////////////
}

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#include "cube.h"
void cube(
Eigen::MatrixXd & V,
Eigen::MatrixXi & F,
Eigen::MatrixXd & UV,
Eigen::MatrixXi & UF,
Eigen::MatrixXd & NV,
Eigen::MatrixXi & NF)
{
////////////////////////////////////////////////////////////////////////////
// Add your code here:
////////////////////////////////////////////////////////////////////////////
////Hint:
// V.resize(8,3);
// F.resize(6,4);
// UV.resize(14,2);
// UF.resize(6,4);
// NV.resize(6,3);
// NF.resize(6,4);
}

17
src/per_corner_normals.cpp Normal file
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#include "per_corner_normals.h"
#include "triangle_area_normal.h"
// Hint:
#include "vertex_triangle_adjacency.h"
#include <iostream>
void per_corner_normals(
const Eigen::MatrixXd & V,
const Eigen::MatrixXi & F,
const double corner_threshold,
Eigen::MatrixXd & N)
{
N = Eigen::MatrixXd::Zero(F.rows()*3,3);
////////////////////////////////////////////////////////////////////////////
// Add your code here:
////////////////////////////////////////////////////////////////////////////
}

13
src/per_face_normals.cpp Normal file
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#include "per_face_normals.h"
#include "triangle_area_normal.h"
void per_face_normals(
const Eigen::MatrixXd & V,
const Eigen::MatrixXi & F,
Eigen::MatrixXd & N)
{
////////////////////////////////////////////////////////////////////////////
// Replace with your code:
N = Eigen::MatrixXd::Zero(F.rows(),3);
////////////////////////////////////////////////////////////////////////////
}

13
src/per_vertex_normals.cpp Normal file
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#include "per_vertex_normals.h"
#include "triangle_area_normal.h"
void per_vertex_normals(
const Eigen::MatrixXd & V,
const Eigen::MatrixXi & F,
Eigen::MatrixXd & N)
{
N = Eigen::MatrixXd::Zero(V.rows(),3);
////////////////////////////////////////////////////////////////////////////
// Add your code here:
////////////////////////////////////////////////////////////////////////////
}

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#include "sphere.h"
#include <iostream>
void sphere(
const int num_faces_u,
const int num_faces_v,
Eigen::MatrixXd & V,
Eigen::MatrixXi & F,
Eigen::MatrixXd & UV,
Eigen::MatrixXi & UF,
Eigen::MatrixXd & NV,
Eigen::MatrixXi & NF)
{
////////////////////////////////////////////////////////////////////////////
// Add your code here:
////////////////////////////////////////////////////////////////////////////
}

13
src/triangle_area_normal.cpp Normal file
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#include "triangle_area_normal.h"
#include <Eigen/Geometry>
Eigen::RowVector3d triangle_area_normal(
const Eigen::RowVector3d & a,
const Eigen::RowVector3d & b,
const Eigen::RowVector3d & c)
{
////////////////////////////////////////////////////////////////////////////
// Replace with your code:
////////////////////////////////////////////////////////////////////////////
return Eigen::RowVector3d(0,0,0);
}

13
src/vertex_triangle_adjacency.cpp Normal file
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#include "vertex_triangle_adjacency.h"
void vertex_triangle_adjacency(
const Eigen::MatrixXi & F,
const int num_vertices,
std::vector<std::vector<int> > & VF)
{
VF.resize(num_vertices);
////////////////////////////////////////////////////////////////////////////
// Add your code here:
////////////////////////////////////////////////////////////////////////////
}

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#include "write_obj.h"
#include <fstream>
#include <cassert>
#include <iostream>
bool write_obj(
const std::string & filename,
const Eigen::MatrixXd & V,
const Eigen::MatrixXi & F,
const Eigen::MatrixXd & UV,
const Eigen::MatrixXi & UF,
const Eigen::MatrixXd & NV,
const Eigen::MatrixXi & NF)
{
if (!(F.size() == 0 || F.cols() == 3 || F.cols() == 4)) {
printf("ERROR in write_obj: F must have 3 or 4 columns");
exit(-1);
}
return false;
}