fantasyvr/generate_cloud_points

generate_cloud_points

Given a 2D triangle mesh, we could randomly generate cloud points that fill in the triangle mesh.

Run

python disp_mesh.py

Or you could use command line arguments: python disp_mesh.py -i data/socks.txt

Triangle Mesh

We provide three tirangle meshes: bunny, armadillo and christmas socks.

Triangle mesh format

numPoints 100
0.1 0.2
....
numTriangles 200
0 1 2
....

Implementation details

1. Read the triangle mesh with read_obj.py
2. Find boundary edges using find_boundary.py
3. Generate random points p in the AABB of triangle mesh
4. Shoot a ray from p and count how many time the ray intersects with boundary edges
5. If the number of intersections is even, then the point p is outside the triangle mesh
6. Otherwise, the point p is inside the triangle mesh
7. If p is inside the triangle mesh, we add it into the final cloud points field (ti.Vector.field)