Computer graphics / 3D
About
This is for raw computer graphics stuff such as 3D rendering and all its associated algorithms.
REYES - Software rasterizer
Images produced by a toy REYES like 3D software renderer made in C for learning and small real-time experiments.
The toy renderer use micropolygons as basis. It support displacement, shaders, four objects type (plane, sphere, cylinder and degree 3 bezier patches), standard scene graph, SSAA, parallel rendering, wireframe modes with line clipping, standard optimizations such as culling, clipping, depth buffering.
REYES always fascinated me, it powered a good chunk of the early CGI stuff and has an elegant process which adapt well to parallelization / vectorization / pipelining. I also wanted to do a real-time software rasterizer but there is already a very high number of them so i decided to combine parts of both.
REYES part is crude (and it may be confusing): it does not have a split stage, it is mainly about uniform subdivision of primitives in UV space. There is also a clear separation / independence between rendering stages.
The first video show variable displacement and micropolygons grid size. The cube video is a first lowfi tentative.
Volumetric renderer
Volume renderer. Hollowed out cube and sphere with noise modulation. Last screenshot is a 2.5D variant.
Raycasting
Oldschool Wolfenstein like raycasting engine made on a phone while commuting. The renderer is capable of rendering 'advanced' geometry such as cylinders or curved walls due to a small grid. The maps are generated by drawing shapes into a buffer.
A second try at a raycasting engine with different algorithm, it iterate over all the display buffer instead of just horizontally and does not use a grid, it is slower but able to do more (curved / sloped walls, different height etc) easily although limited in degree of movements.
Voxel landscapes
Repurposed raycasting engine to render oldschool voxels landscape such as in Commanche games. 5 DOF mostly. Enhanced with fake scattering / fog.
19/08/2021