A software renderer written in C with no dependencies other than the standard library and Win32 API.
Currently renders meshes based on a custom object definition, but I'm hoping to add shading, anti-aliasing, and more of the rendering pipeline if I have extra time to come back to this project.
Run make to create renderer.exe.
Objects are stored in a .obj inspired format, but are handled and parsed by hand (see octahedron.obj for an example).
The format creates objects from a set of vertices labeled v and a set of faces constructed by those vertices labeled f. All other entries in object files are treated as comments.
Points defined in a scene as part of an object are converted to pixels in a raster according to the perspective of a camera, represented by its transformation matrix and focal length, and fitted to the window size. This occurs via a 4 step pipeline seen in raster.c, where Scene/World Coordinates are transformed to the Camera's coordinate system, are mapped in perspective to a defined viewport, converted to normalized device coordinates, and finally raster space.
- Wikipedia - Euler Angles for coordinate system operations.
- Microsoft Learn: Winuser.h, and theForger's Win32 API Programming Tutorial for interacting with Windows.
- Scratch a pixel for insight into, implementations of, background info on, and the details of Computer Graphics at a high level.
- The 1988 paper Juan Pineda - A Parellel Algorithm for Polygon Rasterization for an algorithm to find points inside a triangle.