SphereLevelSet : Add more efficient overrides for hash/computeBound()
#6537
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This fixes `SphereLevelSetTest.testBounds` which I broke when I merged e6cbd98. That exposed a bug in `VDBObject::bound()` whereby it relied on metadata to provide the bound, when in fact the metadata is entirely optional. The VDBObject bug hasn't been a problem for any of our other VDB nodes because they compute Gaffer bounds efficiently rather than making them depend on the voxel grid. While we do have a fix for the VDBObject bug (see ImageEngine/cortex#1423), it seems worthwhile to have a more efficient implementation for SphereLevelSet anyway.
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This fixes
SphereLevelSetTest.testBoundswhich I broke when I merged e6cbd98. That exposed a bug inVDBObject::bound()whereby it relied on metadata to provide the bound, when in fact the metadata is entirely optional. The VDBObject bug hasn't been a problem for any of our other VDB nodes because they compute Gaffer bounds efficiently rather than making them depend on the voxel grid. While we do have a fix for the VDBObject bug (see ImageEngine/cortex#1423), it seems worthwhile to have a more efficient implementation for SphereLevelSet anyway.