How to use comp nodes in VOPs?

[magneto]

I generated some simple images using COPs. Is there a way to use these as textures in VOP context?

I tried using:

ch("../cop2net1/composite1")

for the texture map, but it doesn't seem to work.

Can I do this without rendering the COP results as images to disk?

Thanks

[anim]

you can reference them using op: syntax like

op:/img/img1/file1

or in your case

op:`opfullpath("../cop2net1/composite1")`

EDIT: but be sure you are doing this on VOP parameters not inside of VOP network

Edited March 23, 2012 by anim

[magneto]

Thanks anim. What do you mean on VOP parameters? Do you mean promoted parameters? I tried to use them directly on the parameters of VOPs, but of course it didn't work and mantra complained about not finding the map.

Edited March 23, 2012 by magneto

[anim]

yes, promoted parameters

[magneto]

Thanks, it worked when I did that. Why does it have to be promoted to work? Is it to do with VEX compilation?

[malexander]

VOP networks build code. And you can't very well embed an image in code. When you promote a parameter, it becomes an input to the shader generated, and the shader can evaluate images and geometry. Does that make sense?

[magneto]

Thanks Mark, it definitely does

[galagast]

Hi, I've followed this method before, but for some weird reason, it doesn't seem to be working (H15.347).. or I may have just missed something really simple.

1. I have a grid, with uv texture:
   
2. In SHOPs, I created a simple Material Shader Builder network, the Texture VOP's Map is the only parameter exposed.
   
3. Also in SHOPs, I created a COP network.
   
4. I then set the shader's texture map to point to the COP using:
   

   op:`opfullpath("../comp")`

5. Inside COPs, I have a simple File COP set to load the default Mandril.pic
   
6. I assigned the material to the Grid object then lastly, I rendered the scene.
   
   
   ------------------------------------------------------------------------
    
7. But if try and directly reference the Mandril image like so:
   
   

   $HFS/houdini/pic/Mandril.pic

8. It renders fine..
   

What could I be missing?

 

Attached below is a Houdini Indie file.

H15_INDIE_COPS_in_VOPS.rar