Can I combine multiple projections in Houdini similar to the way you can in Nuke?
http://cg.earlyworm.co.nz/camera-projection-in-nuke/ [cg.earlyworm.co.nz]

If yes, can you please let me know what nodes/setup I should look into?

I'm trying to bake out a composite of projections on a piece of geometry.

Thank You

Hi firefly,
i think you need to be more specific on what you want to do.

However here at least one litte tip

Use -UV texture- node and -perspective from camera- as texture type.
You will also need multiple UVs one for each projection

In your shader setup you can composite the projections.
Or bake out multiple textures and do the composite in cops as a post process.

greetings

olaf

Olaf Finkbeiner
Hi firefly,
i think you need to be more specific on what you want to do.

However here at least one litte tip

Use -UV texture- node and -perspective from camera- as texture type.
You will also need multiple UVs one for each projection

In your shader setup you can composite the projections.
Or bake out multiple textures and do the composite in cops as a post process.

greetings

olaf

Hi Olaf,

Thanks for the help. Basically I would like to do something like this:

https://www.youtube.com/watch?time_continue=4&v=_5Mx9I4tmac [www.youtube.com]

This is a column put together by multiple projections in Nuke. You can see it at 0:13 sec where the projection areas are each colored differently for ease of visualisation of how they're laid out.

So far I know the basics of projection but I get stuck on combining multiple projections together. You say that I should combine them in the shader setup. Would you be able to give me a heads up on how I could do that?

I usually project using a constant shader (should I use something different?) How would I combine them and work out the seams?

Thank you

Hi Firefly,
constant shader is fine and fast if you dont need lighting.
re: seams
Probably the projections should have an alpha or a mask for a smooth transtion.

combining:

In H16 we now have great ways of layering shaders:
http://www.sidefx.com/docs/houdini/shade/layering [www.sidefx.com]
http://www.sidefx.com/docs/houdini/nodes/vop/layercomp [www.sidefx.com]

greetings

Olaf