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Found 4 results

1. ## Multithreaded VEX Catmull-Clark Subdivide SOP

patreon.com/posts/38913618 Subdivision surfaces are piecewise parametric surfaces defined over meshes of arbitrary topology. It's an algorithm that maps from a surface to another more refined surface, where the surface is described as a set of points and a set of polygons with vertices at those points. The resulting surface will always consist of a mesh of quadrilaterals. The most iconic example is to start with a cube and converge to a spherical surface, but not a sphere. The limit Catmull-Clark surface of a cube can never approach an actual sphere, as it's bicubic interpolation and a sphere would be quadric. Catmull-Clark subdivision rules are based on OpenSubdiv with some improvements. It supports closed surfaces, open surfaces, boundaries by open edges or via sub-geometry, open polygons, open polygonal curves, mixed topology and non-manifold geometry. It can handle edge cases where OpenSubdiv fails, or produces undesirable results, i.e. creating gaps between the sub-geometry and the rest of the geometry. One of the biggest improvement over OpenSubdiv is, it preserves all boundaries of sub-geometry, so it doesn't introduce new holes into the input geometry, whereas OpenSubdiv will just break up the geometry, like blasting the sub-geometry, subdividing it and merging both geometries as is. Houdini Catmull-Clark also produces undesirable results in some cases, i.e. mixed topology, where it will either have some points misplaced or just crash Houdini due to the use of sub-geometry (bug pending). Another major improvement is for open polygonal curves, where it will produce a smoother curve, because the default Subdivide SOP will fix the points of the previous iteration in subsequent iterations which produces different results if you subdivide an open polygonal curve 2 times in a single node vs 1 time in 2 nodes, one after the other. This is not the case for polygonal surfaces. VEX Subdivide SOP will apply the same operation at each iteration regardless of topology. All numerical point attributes are interpolated using Catmull-Clark interpolation. Vertex attributes are interpolated using bilinear interpolation like OpenSubdiv. Houdini Catmull-Clark implicitly fuses vertex attributes to be interpolated just like point attributes. Primitive attributes are copied. All groups are preserved except edge groups for performance reasons. Combined VEX code is ~500 lines of code.
2. ## FLIP Retiming jitter

Hi everyone, I'm trying to retime a flip sim, but the retime node is creating a jittering when interpolating frames. Would this have anything to do with particle ids or num of particles changing between frames? and this is mucking up the interpolation? Thanks in advance, David RetimeJitter.hiplc
3. ## Subdivide / interpolate voxel?

Hi guys, I'm working on some pyro simulations which require dense fluid look. I have to crush the density remapping to achieve the dense look. But the banding issue appears. So I'm thinking is it possible to subdivide each voxel to 8 small voxels and interpolate the density value? Thanks!
4. ## Procedurally interpolate values from specific samples in CHOP

Hi! I have a CHOP channel containing some values and I would like to select only a few values at specific samples to then interpolate between them. I have attached a scene where the node `SAMPLES` needs to be used to select the values from `VALUE` to interpolate from. The node `DESIRED` represents the final result that I am after. I'm getting this result by manually creating constant values to interpolate from but it doesn't seem possible to do this procedurallly based on the nodes `VALUE` and `SAMPLES`? Also the process needs to be fast so I would like to avoid using `ic*` expressions if possible. Any idea? Thanks! chop_interpolate.hipnc
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