Physics based Animation--Cloth

Cloth simulation

This project is to implemente physics based animation, cloth-like object interactive with other objects.

Ball interacts with the mesh.

1. Implemented RK4 to solve physics result per frame.
2. Generate the grid mesh. Grid mesh is generated by code, that will add more information to each vertex: the closest 8 vertexes, the max distance of each vertexes. This special data structure will used to resolve the spring force inside of the mesh.
3. Resolve collision. I defined an struct ‘Point’ to represent all objects that will do collision detection. Each Point contains all the information that will be used to do collision detection and RK4: force, mass, velocity, moment, radius and so on. The grid will have n*n points. I created a sphere in the scene as the model to interact with mesh, the radius and position of the sphere can be changed. I used friction = -unit(V) * dot(V,V) * k, it likes air friction.
   For each frame, I do the collision resolve firstly, then calculate the spring force onto a vertex. Next, add friction, finally do RK4 to update position, rotation, velocity and all the physics information of the vertexes.