Autodesk: Deep Selection

[erikaharrison-adsk]

Description of Change(s)

Following up on the feedback from https://github.com/PixarAnimationStudios/OpenUSD/pull/1831

This resolves all code review comments indicated in the original review.

• MacOS support
• Better documentation
• Bug fixing, etc.

Background On Original PR:

This submission adds deep selection capabilities to HdStorm. This allows for selection of all objects within a pick-point or frustum to be selected even if the objects are obscured by other objects drawn on top.

It uses a GPU rendering technique similar to ID based picking except that it accummulates all pick results into a one dimensional "pickBuffer" instead of storing a single selection per pixel like the ID buffer approach does.

It can be enabled by setting a new resolve mode defined as HdxPickTokens->resolveDeep.

A new helper function named TestIntersections(plural) has been added to UsdImagingGlEngine to exercise the new functionality. A new Unit test is included to test the new resolve mode and UsdImagingGLEngine helper function.

Fixes Issue(s)

• N/A

• [X] I have verified that all unit tests pass with the proposed changes
• [X] I have submitted a signed Contributor License Agreement

[jesschimein]

Filed as internal issue #USD-9558

[jesschimein]

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