README.md

Computer Graphics Labs

This repo serves me the sole purpose to track my work on the labs.

LAB 1: SDL

Getting to know SDL2.

LAB 2: RAYTRACER

Time to build a Raytracer with SDL2.

Initial attempts

It took a while to understand it was not a mistake but simply the focal length was too small. Adjusting it made me realize what the problem was.

Added lighting

Lighting intensity with no colors nor shadows, resolution is 100x100 to make interactivity possible.

Colors added in together with lighting.

After adding in shadows + direct lighting + ambient lighting

LAB 3: RASTERIZER

After building a simple raytracer, it's time to build a resterizer!

First, projection was implemented, while also drawing lines between these projected points. Then color is added by drawing lines from one side to the other of each triangle (polygon). Z-buffer not yet implemented.

Per vertex illumination

Lighting is calculated per vertex, and then values are interpolated along the polygon. Z-buffer was also implemented to account for depth.

Per pixel illumination

Maybe not immediately noticeable, but looking closely, lighting effect is a bit skewed in the left image.
The second image does not have the skew effect because perspective correct interpolation was used for the 3D position of the pixels. Apart from this, in both cases, no interpolation is performed for the lighting, but pixel positions are interpolated instead.
Lighting is then calculated for each pixel, making the final result more accurate.

Camera Movement + Light Source Movement