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Don't use a dedicated node layer but use temporary int layer instead.
Works like a charm as long as we are careful resetting the layer when
needed (after pbvh clearing and always after bmesh has been filled in
undo)
Tip by Campbell, thanks!
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Store PBVH node ID in CustomData. This avoids a number of hash deletions
and checks/insertions on big hashes.
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Located on topology panel.
To use just click on button and click on mesh.
Operator will just use the dimensions of the triangles below to set the
constant detail setting.
Also changed pair of scale/detail size with nice separate float
percentage value.
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reflect that. Previous name GPU_Buffers was very similar to GPU_Buffer,
renamed to GPU_PBVH_Buffers
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hides that an arg passed is really an array which may be modified by other functions.
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* Add BLI_pbvh_build_bmesh(), similar to the other PBVH builders but
specialized for BMesh. Whereas the PBVH leaf nodes for mesh and
grids only store a start-index and count into the primitive indices
array, the BMesh version uses GHashes to store the full set of faces
and vertices in leaf nodes
* Update PBVH iterator to handle BMesh
* Make some of the pbvh.c functions non-static so they can be used by
the new pbvh_bmesh code
* The BLI_pbvh_bmesh_update_topology() function is the main reason for
adding BMesh support to the PBVH. This function is used during a
sculpt stroke to dynamically collapse edges that are particular
short and subdivide edges that are particularly long.
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* This doesn't make much difference for regular mesh/multires
sculpting, but for dynamic topology sculpting the undo stack isn't
split up by PBVH nodes, so it's more convenient to store the layer
data in PBVH nodes.
* Note that the life cycle of the layer displacement data is
unchanged -- it's only valid during a stroke with the layer brush,
gets free'd when the undo step ends.
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