Michael Battcock avatar image
Michael Battcock asked ·

Arnold API - Find closest point on surface

I would basically like to recreate the xyzdist and primuv functions from Houdini/mantra. xyzdist finds the closest point on a specified geometry’s surface given a starting position.

I couldn’t find anything similar in the api so I guess ray tracing along a defined ray direction is the closest method.

Does anyone have a simple example of firing a ray and retrieving the hit position, normals and uvs?

And is it possible to ray trace an object from disk? Ie I don’t actually want to render the object being hit. Or would I just have to turn all its visibility off?

And can you specify objects (or even better polygon groups) to ray trace? With tracesets?

Or is osl able to do this?..



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