Implementation

• Building a procedural mesh for the Grass Blades, setting vertices, normals and indices.
• Placing randomly generated grass blades given an extent and a density.
• Raycasting over the terrain to place grass following the uneven surface.
• Sharing a compute buffer with the grass blades data between the compute shader and the material.
• Using GPU Instancing to render all the grass blades.
• Parametrizing the wind direction, wind velocity and wind force.
• Parametrizing colors for young and old grass.
• Using DrawMeshInstancedIndirect to draw procedurally all the meshes using GPU Instancing.
• Perlin noise to calculate the amount of displacement each grass blade needs to have to simulate wind.
• Using Translation and Rotation Matrices to position the vertices of the mesh in World Space and Clip Space.
• Displacing the vertices of the grass blade proportionally to the UV Y coordinate, to make the base stay still.
• Configuring the grass blades to cast shadows and receive shadows.