topic Re: One sub-shader in a mix shader is always blank in Arnold General Rendering Forum

One sub-shader in a mix shader is always blank

Anonymous — Mon, 17 Aug 2020 13:18:30 GMT

I have a mix shader combining together two sub-shaders (also mix shaders) with an alpha map like so.

But when the eye_shader is applied to an object, the area that should be covered by the iris_shader is blank white.

If I apply either one or the other of the two sub-shaders directly to an object, they render as expected.

iris_shader:

eye_background:

The alpha map is a simple transparent png with a black area.

I don't understand how the iris_shader can render as blank in the mix shader when it works fine on its own.

Re: One sub-shader in a mix shader is always blank

lee_griggs — Tue, 18 Aug 2020 06:05:44 GMT

What happens if you use a .jpg instead?

Re: One sub-shader in a mix shader is always blank

Anonymous — Tue, 18 Aug 2020 13:28:18 GMT

Swapped to using a jpg colour channel, no change.

Re: One sub-shader in a mix shader is always blank

Stephen.Blair — Tue, 18 Aug 2020 16:59:24 GMT

Can you upload a scene?

Re: One sub-shader in a mix shader is always blank

Anonymous — Tue, 18 Aug 2020 20:10:18 GMT

https://easyupload.io/qe76df - zipped with the required textures

Re: One sub-shader in a mix shader is always blank

Stephen.Blair — Wed, 19 Aug 2020 19:00:10 GMT

Here's what I got using a layer shader instead of the mix.

I also changed the shading tree a bit (I used pupil.png for the mix mask, and a color correct to invert it).

eye.v2.ma.zip

Re: One sub-shader in a mix shader is always blank

Anonymous — Thu, 20 Aug 2020 16:07:58 GMT

It works great using the LayerShader with the ColorCorrect to invert the mask, thanks!

Any idea why it works with the LayerShader but not with the MixShader? I've been using MixShaders because they don't require the extra step with the ColorCorrect node.