Poke¶
This effect performs softbody-like deformation, displacing input mesh to avoid collision with collider mesh. Since it has no internal physics or time dependence, it can be easily posed/animated. It works with one or two input meshes.
Tip
You can use the color attribute to specify which parts of the input and/or collider mesh should be taken into account. When a color attribute is present, only white (RGB = 255, 255, 255) areas of the mesh and only black (RGB = 0, 0, 0) areas of the collider participate in the collision.
Note
If you don’t specify collider mesh, the color attribute is mandatory (so that the effect knows which parts are supposed to be the collider ie. “rigid”, and which parts should be deformed ie. “soft”.)
To prevent artifacts, it’s important to keep “rigid” and “soft” areas from touching along the surface; there should not be any polygons with both “rigid” and “soft” vertices. Leave a gray area between the white and black parts.
- Input
1 or 2 polygonal meshes (with optional color attribute)
- Output
polygonal mesh
- VTK classes
vtkStaticCellLinks,vtkModifiedBSPTree,vtkPolyDataNormals- Preserves topology
Yes
- Multithreaded
Yes (only building topology)
Options¶
- Maximum distance
Determines how far away from collider can a collision be detected. Default value 0.0 means auto (bounding box diagonal). Small values may cause the collider to sink into mesh and not detect the collision. Large values increase computation time.
- Falloff radius
Controls area around deformation which should be smoothed. Large values create larger area of depression around points of contact.
- Falloff exponent
Controls area around deformation which should be smoothed. Small values create sharper edge at points of contact, while larger values make the transition more smooth.
- Collision smoothing ratio
Controls smoothing inside depressed area. Larger values make the displaced surface more smooth, but may reintroduce collision as the mesh is stretching back.
- Collider normal factor
Blends between displacement along mesh and collider normals.
- Number of iterations
Controls Laplacian smoothing strength; more iterations make smoother surface, may reintroduce collisions as the mesh is stretching back, and increase computation time.
- Offset
Make the collider larger for collision detection (ie. like if it was magnetic, repulsing the mesh at a distance). This can be used to counteract smoothing when it reintroduces collisions.
- Debug
(For development) Save mesh and collider in VTK format for debugging.
Effect of “Falloff exponent”¶
Effect of “Falloff radius”¶
Effect of “Number of iterations”¶
Effect of “Offset”¶
Effect of “Collision smoothing ratio”¶
