Front Projection Mapping

[rustyippolito]

Hey Juanjo- Is there a way to front projection map from the camera onto geometry UVs without baking out a UV texture image? Trying to project plate images back onto a load of different fractured objects and it would be so many less steps if we could do it all in the shaders...

[juanjgon]

I think the best workflow for camera projection mapping is using an osl camera shader. There are several topics about it, like this one:
viewtopic.php?f=101&t=62008

Thanks,
-Juanjo

[rustyippolito]

Thanks for the tip Juanjo. I had utilized this OSL method and it does work (thanks vlucendo!), but it does not stick to the UVs so as soon as the geometry moves (or in my case shatters into RBD sim) the textures all stay projected from the same point and do not move with the geometry points. I know that the one solution is to bake out an image for each object, but I am not sure how to set up a surface baking camera in Houdini/Octane... I was hoping there might be a more elegant solution than baking out a diffuse map for all of the different objects (there are quite a few). Trying to figure out if there is a way to have one shader for all the objects that will project the plate from camera and remain stuck to the objects' UVs as they break apart.