Nyall Dawson 0e363e66c2 Remove abstract class for bounding volumes, and always treat
bounding volumes as OBB

Greatly simplifies the code. There's a small loss of efficiency
since we will always be expanding out spheres to their bounding
boxes, but given we always require boxes for QGIS 3d nodes
anyway this will only impact 2d rendering.
2023-08-10 10:41:23 +02:00
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