Object data bounds improvements proposal #96968
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Reference: blender/blender#96968
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Problems
There are issues with the handling of bounding boxes currently that
result in performance problems, inconsistencies, and overly complicated code:
Design
Bounding Box Definition
This implies that the bounding box wouldn't be copied from the evaluated object
back to the original. While this might require some changes, it should make for
clearer code in the end.
Caching
Since the existing bounds cache really refers to the geometry, it should be cached in
the geometry. Object bounds can be built out of the geometry bounds as necessary.
This should significantly speed up geometry instancing, where the bounds currently
need to be recalculated on every redraw.
Return By Value
Returning
BoundBoxby value when accessing object bounds can make it clear thatit's just built from the geometry bounds. It also makes it possible to remove the allocated
bounding box from
Object.runtime.Implementation
Step 1: Geometry caching, internal changes
e8f4010611e8f4010611BoundBoxby value inBKE_object_boundbox_getBounds<float3>) instead the full 8 cornersBKE_pointcloud_boundbox_getandBKE_mesh_boundbox_getBKE_object_boundbox_get) use the evaluated objectObject.runtime.bb)Step 2: Python/RNA API
Step 3: Remove Syncing
Step 4: Potential Future Improvements
References
This issue was referenced by
e8f4010611