# Computer Animation 2020 - Exercise

## Overview

Code framework for course exercise.

## Installation

Install **Git** and build system **Cmake**. For windows user, MSVC need to be installed.

### Note for linux users

Many linux distributions do not include `gcc` and the basic development tools in their default installation. On Ubuntu, you need to install the following packages:

```
sudo apt-get install build-essential libx11-dev mesa-common-dev libgl1-mesa-dev libglu1-mesa-dev libxrandr-dev libxi-dev libxmu-dev libblas-dev libxinerama-dev libxcursor-dev
```

### Build

Clone this repo (together with the submodule `libigl`):
```
git clone --recursive http://dalab.se.sjtu.edu.cn/gitlab/dalab/ca-framework-2020.git
# if you forget clone submodule at first place
git submodule update --init --recursive
``` 

Run the following commands inside the relevant subfolder to setup the build folder:
```
mkdir build
cd build
cmake ..
```

Compile and run the executable, e.g. Ubuntu:
```
make && ./0_dummy/0_dummy
```

### For Windows

Cmake will generate Microsft visual studio project. Click the `*.sln` file to open the project and build.

## Exercise Handin

**You only need to handin the directory containing the modified executable**. For example (homework 0), you only need to compress folder *0_dummy* and submit the compressed file. *Please don't include any build file, only the source code and related resource file*.

```
zip NAME_ID_0_dummy.zip 0_dummy/*
```

Rename your compressed file following the rule *`NAME_ID_XXX`*.


## FAQ

* Command `cmake ../` stuck at `Cloning into 'eigen'...` or other cloning.

    This may caused by problem of accessing github. Please first try use [SJTU VPN](!https://net.sjtu.edu.cn/wlfw/VPN.htm) and compile. 

    ~~Also, some repos are available on our own server, such as *Eigen*. The download info of libigl dependencies is located at file `libigl/cmake/LibiglDownloadExternal.cmake`. For example, you can change the link at line 70 to `http://dalab.se.sjtu.edu.cn/gitlab/xiaoyuwei/eigen.git` use eigen mirror repo at DALAB server.~~

    ~~glfw (http://dalab.se.sjtu.edu.cn/gitlab/xiaoyuwei/glfw.git) and imgui (http://dalab.se.sjtu.edu.cn/gitlab/xiaoyuwei/imgui.git) are also available on our server.~~

* The menu bar isn't rendered correctly in Release mode using VS2019.

    Solution 1: Use Debug mode.

    Solution 2: Remove `ImGuiWindowFlags_AlwaysAutoResize` flag used in `ImGui::Begin()` and comment out `ImGui::SetNextWindowSizeConstraints()` in `include/Gui.cpp`. See [#1669](https://github.com/libigl/libigl/issues/1669) for more details.

    

----

The main part of this framework refers to physical-based simulation course at ETH Zurich.