feat: Part 1

Without sphere implementation

.devcontainer/Dockerfile

@@ -0,0 +1,19 @@
+FROM mcr.microsoft.com/devcontainers/cpp:1-ubuntu-24.04
+
+ARG REINSTALL_CMAKE_VERSION_FROM_SOURCE="none"
+
+# Optionally install the cmake for vcpkg
+COPY ./reinstall-cmake.sh /tmp/
+
+RUN if [ "${REINSTALL_CMAKE_VERSION_FROM_SOURCE}" != "none" ]; then \
+        chmod +x /tmp/reinstall-cmake.sh && /tmp/reinstall-cmake.sh ${REINSTALL_CMAKE_VERSION_FROM_SOURCE}; \
+    fi \
+    && rm -f /tmp/reinstall-cmake.sh
+
+# [Optional] Uncomment this section to install additional vcpkg ports.
+# RUN su vscode -c "${VCPKG_ROOT}/vcpkg install <your-port-name-here>"
+
+# [Optional] Uncomment this section to install additional packages.
+RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
+    && apt-get -y install --no-install-recommends \
+    libx11-dev libxrandr-dev libxinerama-dev libxcursor-dev libxi-dev libgl1-mesa-dev mesa-utils

.devcontainer/devcontainer.json

@@ -0,0 +1,35 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/cpp
+{
+  "name": "C++",
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
+  "containerEnv": {
+    "DISPLAY": "${localEnv:DISPLAY}",
+  },
+  "remoteEnv": {
+    "DOCKER_BUILDKIT": "0",
+  },
+  "runArgs": [
+    "--volume=/tmp/.X11-unix:/tmp/.X11-unix",
+    "--network", "host"
+  ],
+  // Features to add to the dev container. More info: https://containers.dev/features.
+  // "features": {},
+
+  // Use 'forwardPorts' to make a list of ports inside the container available locally.
+  // "forwardPorts": [],
+
+  // Use 'postCreateCommand' to run commands after the container is created.
+  // "postCreateCommand": "gcc -v",
+
+  // Configure tool-specific properties.
+  "customizations": {
+    "jetbrains": {
+      "backend": "CLion"
+    }
+  },
+  // Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+  "remoteUser": "root"
+}

.devcontainer/reinstall-cmake.sh

@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+#-------------------------------------------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See https://go.microsoft.com/fwlink/?linkid=2090316 for license information.
+#-------------------------------------------------------------------------------------------------------------
+#
+set -e
+
+CMAKE_VERSION=${1:-"none"}
+
+if [ "${CMAKE_VERSION}" = "none" ]; then
+    echo "No CMake version specified, skipping CMake reinstallation"
+    exit 0
+fi
+
+# Cleanup temporary directory and associated files when exiting the script.
+cleanup() {
+    EXIT_CODE=$?
+    set +e
+    if [[ -n "${TMP_DIR}" ]]; then
+        echo "Executing cleanup of tmp files"
+        rm -Rf "${TMP_DIR}"
+    fi
+    exit $EXIT_CODE
+}
+trap cleanup EXIT
+
+
+echo "Installing CMake..."
+apt-get -y purge --auto-remove cmake
+mkdir -p /opt/cmake
+
+architecture=$(dpkg --print-architecture)
+case "${architecture}" in
+    arm64)
+        ARCH=aarch64 ;;
+    amd64)
+        ARCH=x86_64 ;;
+    *)
+        echo "Unsupported architecture ${architecture}."
+        exit 1
+        ;;
+esac
+
+CMAKE_BINARY_NAME="cmake-${CMAKE_VERSION}-linux-${ARCH}.sh"
+CMAKE_CHECKSUM_NAME="cmake-${CMAKE_VERSION}-SHA-256.txt"
+TMP_DIR=$(mktemp -d -t cmake-XXXXXXXXXX)
+
+echo "${TMP_DIR}"
+cd "${TMP_DIR}"
+
+curl -sSL "https://github.com/Kitware/CMake/releases/download/v${CMAKE_VERSION}/${CMAKE_BINARY_NAME}" -O
+curl -sSL "https://github.com/Kitware/CMake/releases/download/v${CMAKE_VERSION}/${CMAKE_CHECKSUM_NAME}" -O
+
+sha256sum -c --ignore-missing "${CMAKE_CHECKSUM_NAME}"
+sh "${TMP_DIR}/${CMAKE_BINARY_NAME}" --prefix=/opt/cmake --skip-license
+
+ln -s /opt/cmake/bin/cmake /usr/local/bin/cmake
+ln -s /opt/cmake/bin/ctest /usr/local/bin/ctest

.gitignore

@@ -38,3 +38,119 @@ CMakeSettings.json
 build/*
 bin/*
 *.DS_Store
+
+# ---> JetBrains
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/
+
+# CMake
+cmake-build-*/
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# ---> C
+# Prerequisites
+*.d
+
+# Object files
+*.o
+*.ko
+*.obj
+*.elf
+
+# Linker output
+*.ilk
+*.map
+*.exp
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Libraries
+*.lib
+*.a
+*.la
+*.lo
+
+# Shared objects (inc. Windows DLLs)
+*.dll
+*.so
+*.so.*
+*.dylib
+
+# Executables
+*.exe
+*.out
+*.app
+*.i*86
+*.x86_64
+*.hex
+
+# Debug files
+*.dSYM/
+*.su
+*.idb
+*.pdb
+
+# Kernel Module Compile Results
+*.mod*
+*.cmd
+.tmp_versions/
+modules.order
+Module.symvers
+Mkfile.old
+dkms.conf
+
+# ---> C++
+# Prerequisites
+*.d
+
+# Compiled Object files
+*.slo
+*.lo
+*.o
+*.obj
+
+# 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

src/cube.cpp

@@ -8,15 +8,67 @@ void cube(
   Eigen::MatrixXd & NV,
   Eigen::MatrixXi & NF)
 {
-  ////////////////////////////////////////////////////////////////////////////
-  // Add your code here:
-  ////////////////////////////////////////////////////////////////////////////
+  // Construct default Blender cube.
 
-  ////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);
+  V.resize(8,3);
+  F.resize(6,4);
+//  for (int i = 0; i < 8; i++) {
+//    V(i,0) =  1 - (i&4) / 2;
+//    V(i,1) =  1 - 2 * (i&1);
+//    V(i,2) = -1 + 1 * (i&2);
+
+//    V.row(i) = Eigen::RowVector3d(1 - (i&4) / 2, 1 - 2 * (i&1), -1 + 1 * (i&2));
+
+    /* Add Vertex to the faces it belongs to */
+//    F(0 + (i&4) / 2, i % 4) = i;
+//    F(1 + 2 * (i&1), i / 2) = i;
+//    F(5 - (i&2) / 2, (i % 4) % 2 + (i / 4) * 2) = i;
+//  }
+
+  V.row(0) = Eigen::RowVector3d( 1,  1, -1);
+  V.row(1) = Eigen::RowVector3d( 1, -1, -1);
+  V.row(2) = Eigen::RowVector3d( 1,  1,  1);
+  V.row(3) = Eigen::RowVector3d( 1, -1,  1);
+  V.row(4) = Eigen::RowVector3d(-1,  1, -1);
+  V.row(5) = Eigen::RowVector3d(-1, -1, -1);
+  V.row(6) = Eigen::RowVector3d(-1,  1,  1);
+  V.row(7) = Eigen::RowVector3d(-1, -1,  1);
+
+  F.row(0) = Eigen::RowVector4i(1, 2, 4, 3);
+  F.row(1) = Eigen::RowVector4i(5, 1, 3, 7);
+  F.row(2) = Eigen::RowVector4i(6, 5, 7, 8);
+  F.row(3) = Eigen::RowVector4i(2, 6, 8, 4);
+  F.row(4) = Eigen::RowVector4i(3, 4, 8, 7);
+  F.row(5) = Eigen::RowVector4i(5, 6, 2, 1);
+
+  NV.resize(6,3);
+  NV.row(0) = Eigen::RowVector3d(1, 0, 0);
+  NV.row(1) = Eigen::RowVector3d(0, 1, 0);
+  NV.row(2) = Eigen::RowVector3d(-1, 0, 0);
+  NV.row(3) = Eigen::RowVector3d(0, -1, 0);
+  NV.row(4) = Eigen::RowVector3d(0, 0, 1);
+  NV.row(5) = Eigen::RowVector3d(0, 0, -1);
+
+  NF.resize(6,4);
+  for (int i = 1; i <= 6; i++) {
+    NF.row(i - 1) = Eigen::RowVector4i(i, i, i, i);
+  }
+
+  UV.resize(14,2);
+  UV.row(0) = Eigen::RowVector2d(0.25, 0);
+  UV.row(1) = Eigen::RowVector2d(0.5, 0);
+  for (int i = 0; i < 5; i++) {
+    UV.row(2 + i) = Eigen::RowVector2d(0.25 * i, 0.25);
+    UV.row(7 + i) = Eigen::RowVector2d(0.25 * i, 0.5);
+  }
+  UV.row(12) = Eigen::RowVector2d(0.25, 0.75);
+  UV.row(13) = Eigen::RowVector2d(0.5, 0.75);
+
+  UF.resize(6,4);
+  UF.row(0) = Eigen::RowVector4i(4, 5, 10, 9);
+  UF.row(1) = Eigen::RowVector4i(5, 6, 11, 10);
+  UF.row(2) = Eigen::RowVector4i(6, 7, 12, 11);
+  UF.row(3) = Eigen::RowVector4i(3, 4, 9, 8);
+  UF.row(4) = Eigen::RowVector4i(9, 10, 14, 13);
+  UF.row(5) = Eigen::RowVector4i(1, 2, 5, 4);
 }

src/write_obj.cpp

@@ -16,5 +16,39 @@ bool write_obj(
     printf("ERROR in write_obj: F must have 3 or 4 columns");
     exit(-1);
   }
-  return false;
+
+  /* Write to file */
+  std::ofstream out(filename.c_str());
+  if (!out) {
+    printf("ERROR in write_obj: can't write to %s\n", filename.c_str());
+    return false;
+  }
+
+  /* Geometric vertices .*/
+  for (int i = 0; i < V.rows(); i++) {
+    out << "v " << V(i, 0) << " " << V(i, 1) << " " << V(i, 2) << std::endl;
+  }
+
+  /* Vertex normals */
+  for (int i = 0; i < NV.rows(); i++) {
+    out << "vn " << NV(i, 0) << " " << NV(i, 1) << " " << NV(i, 2) << std::endl;
+  }
+
+  /* Vertex texture coordinates */
+  for (int i = 0; i < UV.rows(); i++) {
+    out << "vt " << UV(i, 0) << " " << UV(i, 1) << std::endl;
+  }
+
+  /* Face elements */
+  for (int i = 0; i < F.rows(); i++) {
+    out << "f";
+    for (int j = 0; j < F.cols(); j++) {
+      out << " " << F(i, j) << "/" << UF(i, j) << "/" << NF(i, j);
+    }
+    out << std::endl;
+  }
+
+  out.close();
+
+  return true;
 }