VIDEO:

DESCRIPTION:

High performance softbody physics simulation written from scratch in C++/CUDA/OpenGL. Scales up to around 3-4M particles on my RTX 4070 Super at 60FPS. The main things that made this possible were:

• Fast spatial partitioning that's cache friendly and has linear time neighbor query and is entirely on the GPU
• CUDA usage + CUDA/OpenGL interop to offload the simulation to the GPU massively increasing performance, minimizing CPU-GPU talk
• Efficient instanced rendering + usage of GL_POINT_SPRITE to massively reduce vertex count
• Verlet integration for particle simulation to improve numerical stability and reduce positional drift
• Structures of Arrays instead of Array of Structures to improve cache locality
• Spring like constraints between particles, emergently forming soft bodies

CONTROLS:

E - Generate Softbody

R - Reset World

SPACE - Pause

G - Slow mo

LEFT CLICK - Particle mover

RIGHT CLICK - Move camera

REQUIREMENTS TO COMPILE:

GLEW

GLFW

Cuda Toolkit

REQUIREMENTS TO RUN:

NVIDIA GPU