This project is my implementation of the paper by Jahrmann and Wimmer: Responsive Real-Time Grass Rendering for General 3D Scenes. This paper differentiates itself from the field by presenting a method to simulate each blade of grass as an individual geometric object using OpenGL's tessellation pipeline.
Scene with 7 million blades of grass individually waving accoring to a periodic wind function running at 60 fps on my personal laptop (which has a GTX 1650 gpu). Due to the compression in the gif screen capture tool I used please refer to the picture above for a better idea of the quality and coloring.
This clip shows an example of object collisions and the grass recovery force discussed in section 5.1 of the paper.
main.cpp contains the OpenGL setup and loop.
shaders/grass.tc is the tessellation control shader - where the tessellation levels are set.
shaders/grass.te is the tessellation evaluation shader - where the bezier functions from section 6.3 of the paper are implemented.
shaders/grass_force.comp is the compute shader - where the bulk of the paper is implemented; the wind force, the validation model, and collision processing.
You will need GLEW, GLFW, and GLM. It also depends on stb for the blade texture but that's included in third_party.
In the root folder run
mkdir build
cd build
cmake ../
make