Computer Graphics
Assignment 9 – Perlin Noise
Computer Graphics
Group
Task 1: 1D Perlin Noise
- Implement Perlin noise in fragment shader function
float perlin_noise_1d(float x);- Useful:
floorto find grid point - Implement fractional brownian motion (fBm)
float perlin_fbm_1d(float x);
Task 2: 2D Perlin Noise
float perlin_noise(vec2 point);float perlin_fbm(vec2 point);float turbulence(vec2 point);
These images are zoomed, don’t expect the exact same output!
Task 3: Textures using Perlin noise
Per-fragment:
- Compute scalar from noise function expression
- Map to color (
mix()for interpolation) - Just for fun: try using
uniform float t…
Task 4: Terrain generation: Geometry
std::shared_ptr<Mesh> build_terrain_mesh(Array2D<float> const& height_map) {
std::pair<size_t, size_t> const grid_size = height_map.size();
std::vector<vec3> vertices(grid_size.first * grid_size.second);
std::vector<Mesh::Face> faces;
// [...]
return std::make_shared<Mesh>(vertices, faces);
}- Noise-based height map rendered into Array2D (
utils/array2d.h) - Position vertices on and above \([-0.5, 0.5]^2\) plane
- Tesselate with triangles
Task 4: Terrain generation: Shading
- Compute normals
- Compute normal matrix
- Compute materials based on height: color & shininess
