Lab02- Debugging Shader

Bugs

Line 97: vec uv2 = 2.0 * uv - vec2(1.0);
- vec should be vec2.
- Found it by directly compile the shader.
Line 100: raycast(uv, dir, eye, ref);
- uv should be uv2.
- Found it by first seeing that 3/4 of the screen is cut off.
Line 11: H *= len * iResolution.x / iResolution.x;
- Should be iResolution.x / iResolution.y
- Found it by seeing the spheres being oval.
Line 18: for(int i = 0; i < 64; ++i)
- 64 should be some larger number, such as 128
- This causes too few iterations during ray marching so that floor would not expand far enough
Line 75: dir = reflect(eye, nor);
- eye should be dir
- Found it by seeing incorrect reflection. Correct reflection should take view direction and normal as inputs.