Computer Graphics Assignments

CS 425 Computer Graphics · Assignment 3

Lighting and shading

Illumination and shading on terrain meshes: normals, a normal-visualization mode and per-pixel Phong shading.

Geometry is drawn with index buffers. I computed and transformed the vertex normals, added a mode that visualizes them as colors, and implemented Phong shading per pixel in the fragment shader, with both directional and point lights.

What I implemented

Terrain loading from image and BSQ files
Indexed mesh rendering with averaged per-vertex normals
A normal-coloring mode for debugging
Phong shading with ambient, diffuse and specular terms
Controls for the light direction and type, directional or point
Extra: terrain texturing

Result

A Phong-shaded terrain lit from the side. — Phong shading on the Mount Rainier terrain.

Live demo

Open in a new tab

Choose a dataset from the dropdown inside the demo, then switch between the shading modes and lights.