This PR gives access to OpenVDB's level set filtering operations
through individual **SDF Grid** nodes.
- **Mean Curvature**: Smoothens high curvature areas more than flatter
ones.
- **Laplacian**: Approximates mean curvature flow for true SDFs at lower
computational cost.
- **Median**: Reduces noise while preserving sharp features.
- **Mean**: Fast separable averaging filter for general-purpose
smoothing with linear computational complexity.
- **Offset**: Uniform dilation/erosion operation that shifts the SDF
surface by a world-space distance.
- **Fillet**: Rounds off concave internal corners by operating only on
regions with negative principal curvature.
Pull Request: https://projects.blender.org/blender/blender/pulls/147224
438b8c303e