Material projection

[Whithers]

Bonjour a tous,

I was fiddle-farting all day trying to figure this out, though I'm sure it's an easy solve for many.

Observe Exhibit A: a render from C4D where I've connected all the objects in the scene and projected a material spherically outward, onto everything. UV's are, obviously, ignored.

Exhibit B well illustrates the trouble I'm having in Houdini.

Would someone kindly prod me in the right direction? Should I use a..... lightsaber? Er, shader. Or is there a way to manipulate the uv's in such a way that this could be the result? Another complicating factor is it has to be animated eventually, but I'm more concerned atm with just replicating what I can do in C4D, as shown.

Thanks a million in advance.

Edit: Note that I don't think I can use (and haven't tried for this reason) camera mapping, as I need a 360 projection (at least 180, like a spotlight, so I can duplicate and rotate it to get what I need, since it doesn't have to be perfect).

Edited January 17, 2013 by Whithers

[anim]

here is simple projection in surface shader

it is based on null object position in the scene so you can easily animate center of the projection (null named move_me)

since it is a shader, there is no need to merge your objects into one, just use the shader on any object you want

if you dive inside it, notice it is using UV project VOP node and you can connect any texture to uv data it creates

uvproject_in_shader.hip

Edited January 17, 2013 by anim

[anim]

here is updated version in case you want to rotate the projection using that object as well (instead of just specifying the center)

uvproject_in_shader_using_object_xform.hip

[Whithers]

That is so smart, anim, thank you so much.

Very clever getting the stripes, too. You're an inspiration. Next time I swing through London I'll buy you a round.

[anim]

thanks Whithers, certainly let me know if you are in London

[sl0throp]

Thomas...great simple file. Do you know how one could do what Maya calls a tri-planar projection, where the texture is projected along all six axis of a cube regardless of UV's?

[petz]

even though i´m not tomas, the attached file might help...

petz

triplanar.hipnc

[sl0throp]

Hey Petz, thanks for your file.

[dileshlamsal]

Great example ..is there a way to get the blend between two projections ..in this case ?