Hello,
I'm wondering if anyone knows how to create texture projections from camera. Onto existing USD asset. I have some scorch marks that I need to project, but can't find anything in the docs on how to do this with Karma and MaterialX.

Any suggestions?

regards
stefan

I've been trying to get this to work recently.
I've figured out the camera frustum projection using regular MaterialX nodes, and it's working in a UE5 material, so I'm < fairly > sure it'll work here, too.

Requires feeding in the camera vectors (FWD, RIGHT, UP), which I haven't figured out how to do automatically from a camera in the scene. This might make the workflow pretty irritating.

.hip of my current progress is attached if it helps

I was going to say use a coordsys, but it's too buggy in its current implementation to recommend.

I've attached a scene demonstrating their use, but the way transforms are concatenated seems to be broken.

Thank you! It works, though a bit hacky. I hope that h20 will come with a node ( or combo of nodes ) which this is implemented.

all the best!
stefan

StefanA
Thank you! It works, though a bit hacky. I hope that h20 will come with a node ( or combo of nodes ) which this is implemented.

all the best!
stefan

19.5 is when they added it. I made a mistake in my setup when using a camera projection that I thought was a bug. The space needs to be specified as space_name:ndc for a perspective camera projection.

there is also SimpleCoordSys example file that ships with Houdini