README.md

What?

3DSR (short for 3D Software Rasterizer) is a simple renderer that uses the rasterization technique, completely implemented in C++.

Libraries

• tinyobjloader
• SDL To set up a window and view the results of the rendering in real-time. None of the visuals drawn to the screen use SDL's functions for drawing to the screen.

Building and Running (Linux)

In the cloned repo:

• mkdir build && cd build
• cmake ..
• make

Finally, use ./3DSR in the build folder to run it.

Lessons

• Be careful of using std::numeric_limits<float>::min() since this will give you the lowest possible POSITIVE value. Use std::numeric_limits<float>::lowest() instead.
• Be careful with loading data. For example, with tinyobjloader: make sure you're indexing into attrib.normals with the normal_index to get the normals.

References

• https://github.com/JamesGriffin/3D-Rasterizer
• https://github.com/ssloy/tinyrenderer
• https://github.com/NotCamelCase/SoftLit
• https://github.com/karltechno/SoftRast

For learning SDL2, this website has been very handy:

• http://lazyfoo.net/tutorials/SDL/index.php

For a deeper overview into the basic rasterization algorithm:

• https://fgiesen.wordpress.com/2013/02/08/triangle-rasterization-in-practice/
• https://www.scratchapixel.com/lessons/3d-basic-rendering/rasterization-practical-implementation/rasterization-stage

About barycentric coordinates:

• https://www.scratchapixel.com/lessons/3d-basic-rendering/ray-tracing-rendering-a-triangle/barycentric-coordinates

About homogeneous coordinates:

• http://www.songho.ca/math/homogeneous/homogeneous.html

About the coordinate transform pipeline:

• https://www.youtube.com/watch?v=jmRkYDFDIp0&list=PLbMVogVj5nJSyt80VRXYC-YrAvQuUb6dh&index=19 (awesome series of videos, but be warned, his math is possibly incorrect)
• http://www.songho.ca/opengl/gl_transform.html#projection (overview)
• http://math.hws.edu/graphicsbook/c3/s3.html (overview)
• https://computergraphics.stackexchange.com/questions/1769/world-coordinates-normalised-device-coordinates-and-device-coordinates (about all the different coordinates)
• http://www.songho.ca/opengl/gl_camera.html (construction of openGL view matrix)
• http://www.songho.ca/opengl/gl_projectionmatrix.html#perspective (construction of openGL projection matrix)
• https://www.scratchapixel.com/lessons/3d-basic-rendering/rasterization-practical-implementation/projection-stage (about projection)
• https://paroj.github.io/gltut/Positioning/Tut04%20Perspective%20Projection.html (about projection)
• http://www.codinglabs.net/article_world_view_projection_matrix.aspx (constructing projection matrix at the bottom, using fov)
• https://computergraphics.stackexchange.com/questions/6271/what-is-the-use-of-homogenous-divide (very good question and answer)