How To Change Uv's Of Instanced Objects

[ygalula]

Hello,

I"m trying to point instance some boxes and I want to project (orthographically) a texture over the boxes so that the texture will cover all of the boxes (as oppposed to projecting it on one box and duplicating this box).

I"m trying to build a VEX shader for it, but the problem is I can't find out the location of my instanced box. I only know P in world (screen) space or in texture / object space which is per box and not relative to the whole bunch of them.

Must I use a procedural instance script?

Thanks

[AdamJ]

You could convert instance positions into NDC space and use that to look up a texture. Here's a quick example..

ndcInstances.hip.gz

[ygalula]

You could convert instance positions into NDC space and use that to look up a texture.  Here's a quick example..

25942[/snapback]

Thanks,

but I ment for something a bit different.

I want the projection to be orthographic and not 'camera projection'.

So, knowing the position in screen space is not enough...

Here is an example of what I want to do( using 'copy' instend of instancing).

Thanks.

example.zip

[AdamJ]

oh ok.. then converting to world space for the instances should do it..

orthoInstances.zip

[ygalula]

Thanks !