Render Layers

[melc92]

Hi!

 

I have a shot that I'm working on, where I have tracked footage and brought it into Houdini.

 

The issue I'm having is that I want to render the shapes without the stairs from Houdini, however if I turn the stair layer off then the stairs won't cut into the shapes like it needs to as the shape is sitting on the step? I know in Maya, you would use a surface_shader for this but I have no idea what the equivalent to that would be in Houdini.

 

I have attached image to show what I mean as I'm not the best at explaining things.

 

Any help at all would be great!

 

Thanks, Mel.

[davpe]

set the stairs object as an Forced Matte in Mantra ROP (Mantra ROP > Objects > Forced Matte) 

[zoki]

you can also use shadow matte shader on stairs so you get objects shadows on the "invisible stairs"

then render objects separate with stairs as phantom>under render tab on geometry node

then you should have all to do the comp

[melc92]

Thanks!