Explaining Triangle Rasterization in 30 Minutes
6Rasterization is the process of putting pixels on the screen. We've talked about line rasterization before (you iterate along the x axis if the line is more horizontal or the y axis if it is more vertical and can do antialiasing pretty easily too.
Today we went over how to raster a triangle. Doing wireframe (just the edges) is easy - just use line rasterization, right? But filling a triangle seems a bit tricky at first, so I go over how to do that here.
I then talk about barycentric coordinates and how you can use that to colorize a triangle smoothly if its vertices have different colors.
I also went over the frame buffer / fragment buffer and the depth buffer / z buffer for how to handle two triangles drawing to the same spots at different depths (the nearer one gets drawn, the pixel further away gets discarded).