Hi
I am trying to project an HDR ball onto geometry and turn that geometry into a mesh light so I get accurate HDR light rather than the just coming out of an infinite sphere.

I am stuck on how to get a projection to work. I need a ball type projection and be able to translate and rotate it around to line it up with the geo.
So in Maya all I do it move and rotate the ball in the viewport with textures on in viewport to line it up. How do you do this in Houdini? I can see no options anywhere for “ball” projections. I have googled it and got other types of projections but nothing that I need. Any help would be apricated. Best

Mark

Did you try the polar projection mode of the UV Project sop? You'll need lots of vertices to project onto, as linear interpolation is a poor match for polar projections which will result in distortion.

I don't know if there's a handle to control the projection locus and rotation interactively, but there are are parameters on the node.

https://www.sidefx.com/docs/houdini/nodes/sop/uvproject.html [www.sidefx.com]