Camera has no position or direction members...

5>D:\lighthouse2\apps\pbrtdemoapp\main.cpp(189,51): error C2039: 'position': is not a member of 'lighthouse2::Camera'
5>D:\lighthouse2\lib\RenderSystem\camera.h(25): message : see declaration of 'lighthouse2::Camera'
5>D:\lighthouse2\apps\pbrtdemoapp\main.cpp(190,52): error C2039: 'direction': is not a member of 'lighthouse2::Camera'
5>D:\lighth

The current behaviour of glossy and glossycoating is to behave like matte on the backface.
I can't think of a good reason for this, and it is very confusing for users, so I would like to request to rework these materials to show their coating on both front and back faces.

(intended for v2.4)

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This would make it easier for new users to find the denoised result.
Also better compatibility with Cycles compositing node trees.

Would be nice to implement #251 at the same time so the user can still see progress in endless render mode.

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The implementation should allow

• easy to use coordinate transforms
• fast
• handle index transforms too