Embree has various different acceleration structures.
Is there any documentation about these structures
and various triangle intersection algorithms?
In particular, there are various global settings
(g_top_accel, g_tri_accel, g_builder, etc.) that are used in
'embree/kernels/common/scene.cpp', but there appears
little or no documentation about what various options
are, when one might want to use them and trade-offs.
It would be very useful to better understand what these are.