VR / AR > Point Cloud Scatterer

Point Cloud Scatterer

Recorded from Unity

Asset Preparation

The seahorse asset was purchased from sketchfab.

Point Cloud Animation

Houdini's scatter SOP is one of the most popular nodes. By storing i@sourceprim and v@sourceprimuv from the reference mesh, and by using primuv() function, we can make point cloud stick on animated mesh. I implemented the same tool with compute shaders and with GPU instancing in Unity. It scattered points on mesh, relaxed the points' position to evenly distribute the density, and made the points animated with skinned mesh.

Point Scatter

Houdini's scatter SOP is one of the most popular nodes. I implemented a same function in Unity. It scattered points on mesh, relaxed the points' position to evenly distribute the density and made the points animated with skinned mesh.

Cells in 3D Grid

By counting the cell ids, the neighbors cells were detected analytically in the cell grid.

Closest point on triangle

Linked Visitor List Algorithm for Neighbor Search

With the

I developed a neighbor search algorithm to run the point relaxation. Two buffers were used for inserting and for traversing points in cells.

I used the InterlockedExchange function in order to avoid the racing

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