chunked, multiscale volume rendering

[kevinyamauchi]

This issue discusses the approach to performing chunked, multiscale randering.

General approach:

1. Redraw requested
2. Get the camera frustum in world coordinates
3. Get the chunk indices that are required
4. Request the chunks
5. Receive and render the chunks as they arrive

Questions:

• how to render the objects? should it be a single volume per resolution level? should each resolution level have some chunks?

Links:

• pygfx object groups: https://pygfx.readthedocs.io/en/latest/_autosummary/objects/pygfx.objects.Group.html
• pygfx volume: https://pygfx.readthedocs.io/en/stable/_autosummary/objects/pygfx.objects.Volume.html#pygfx.objects.Volume
• determine if point inside of frustum: https://gamedev.stackexchange.com/questions/79172/checking-if-a-vector-is-contained-inside-a-viewing-frustum

[kevinyamauchi]

checking if chunks are in frustum: https://iquilezles.org/articles/frustumcorrect/ pygfx camera frustum: https://pygfx.com/stable/_autosummary/cameras/pygfx.cameras.PerspectiveCamera.html#pygfx.cameras.PerspectiveCamera.frustum