Introduction to Computer Graphics (Lecture 12): Accelerating ray tracing; bounding volumes, Kd trees

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6.837: Introduction to Computer Graphics
Autumn 2020

Many slides courtesy past instructors of 6.837, notably Fredo Durand and Barbara Cutler.
  1. Justin Solomon
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At 39:30, true you need to consider the second box for possible intersections but ONLY if you care about location of intersection or other details. For example, it you’re just triangle to detect if the shadow ray reaches the light source, you can stop at the first intersection discovered.

foomoo
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At 1:05:50, just keep a list of triangle ids for triangles you’ve already checked. This could be fixed size too and “circular buffer” so you don’t need alloc while marching. The circular buffer will naturally always hold triangles for a few neighboring bins if the spatial hash is tuned properly (e.g. bins hold number of triangles equal to 1/5 circular buffer size.

foomoo
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Thank you very much for the free knowledge !

Poeterish
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I recently heard about volumetric meshes. Does anyone know how that is related to the bounding volume hierarchy (BVH) technique? Is volume mesh an alternative?

chuanqisun