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  1. OpenVDB
  2. OVDB-56

Sparse Activation of VDB Grids in Parallel

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      There's no way to sparse activate a grid without also setting the value.

      CoordBBox bbox;
grid.sparseFill(bbox, ValueType(0), /*active*/true);

      This is a better alternative:

      openvdb::MaskGrid mask(/*background=*/false);
mask.fill(bbox, /*value=*/true, /*active=*/true);
grid.topologyUnion(mask);

      This is a bit obscure to know this though. I suggest something like this:

      grid.sparseActivate(bbox, /*active=*/true);

      Also, the similar logic that JeffLait has introduced to GEO_PrimVDB for intersections could be more broadly useful too:

      openvdb::MaskGrid mask(false);
mask.fill(bbox, true, true);
grid.topologyIntersection(mask);
geoInactiveToBackground<GridType> bgop(grid);
openvdb::tools::foreach(grid.beginValueOff(), bgop);

            Unassigned Unassigned
            danrbailey danrbailey
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              Created:
              Updated: