Software 3D Rendering Engine

This project is to demonstrate rasteraization 3D rendering pipeline in software. Every rendering stage of the project was implemented from scratch using conventional algorithms with pure C++ code, for example, camera projection, texture lookup, framebuffer, lighting, shadow, 3D mathematics, .etc. Moreover, this project also provides functions to extend the software rendering pipeline to GPU using OpenGL and CG shader.

Environment

Windows 10 x64
Visual Studio 2017 Release x64

Relevant Headers

  /* Axis Aligned Bounding Box */
  AABB.h 
  /* 
   * Constructor for software pinhole camera  
   * Project and unproject function
   * Translation, pan, tilt, roll function
   * Camera Interposlation
   * Additonal support for GPU view and projection matrix
  */
  Camera.h 
  /* 
   * Constructor for cube map  
   * Bilinear look up for cube map
  */
  cubemap.h  
  /* 
   * Constructor for framebuffer 
   * Zbuffer, Color buffer, Alpha buffer set and clear
   * Load and save frambuffer
   * Nearest lookup and Bilinear lookup
   * Use as depth buffer, texture buffer or display image
  */
  framebuffer.h  
  /* 
   * Constructor for point light
   * Light camera
  */
  light.h
  /* 3D mathematic funcitons */
  m33.h
  v3f.h
  /* 
   * Constructor for triangle mesh
   * Load triangle mesh from binary model
   * Scale, rotate, and translate mesh
   * Render mesh in fill mode / wireframe
   * Render mesh with / without lighting / textures (Model space / Screen space)
  */
  mesh.h
  /* scene manager */
  scene.h
  /* GPU interface */  
  CGInterface.h

Demos

Guide

In main.cpp, change current demo by changing the following line:
```
#define USING_DEMO SOFTWARE_SM_PTM_DEMO  
```
Then Build and run under specified environment

Software Shadow Mapping and Projective Texture Mapping Demo

https://youtu.be/CttNZ9FeePo
- Shadow mapping
- Transparent texture projector
https://youtu.be/sYHK0IVA1ag
- Invisibility with projector

Software Environment Mapping Demo

https://youtu.be/Yn06Psa5j9w
- Per-pixel reflected ray look up for reflector
- Eye-rays look up for environment
- Refraction and fake Fresnel

Hardware Extension using CG shader Demo

https://youtu.be/Ucnvez-XPNo
- A demonstration for hardware rendering support using CG shader.
- Reflection Approximation by Imposter. The reflection of the back teapot is rendered by approximating the front teapot with billboard. The texture of billboard is precomputed in main.cpp and looked up in GPU shader, besides I created a new window to display the texture of billboard.

zhan2586/Software-3D-Rendering-Engine