Multiple transparent objects with same material hiding each other

Hey,

I've got an issue and the feeling this could be relativley easy be solved with a stencil or use of the depth buffer. But I can't manage to achieve what I want.

I need some transparent lines which are very likely to stack at some points. Under those lines are additional solid tubes. I want the lines to be only drawen once where they overlap, but always show the tubes under them.



Right now I have a transparent shader writing to zbuffer. What happens is the lines are z-fighting. It often looks like the red circeled one. But I wan't it to always look like the green circeled parts.

Is there any easy way (without modifying the line meshes) to achieve this?

Best, Jan

 

You probably want to use stencils instead of zwrite for this. Zwrite is still very draw order dependant, so if something doesn't draw in exactly the correct order, or if two surfaces are co-planar, then you'll get the issues you're seeing. Stencils don't care about that at all (for this specific use case).

Try this:

Code (csharp):

1. Stencil {
2.     Ref 1
3.     Comp NotEqual
4.     Pass Replace
5. }

That's saying check if the stencil is set to 1 (Ref 1). If it isn't (Comp NotEqual) then draw the object and set the stencil to 1 (Pass Replace). If it is 1, skip drawing.

 

Awesome, I thought I tried this. But, whatever ‍ Thank you very much!