I’m trying to recreate the ShadowOnlyMaterial with the NodeMaterialEditor because I need to control the shadow opacity. Here’s is what I have came up with:
Every is working great as long as there is only 1 light in the scene.
If I have multiple lights, only the shadows of the last light added into the scene show up.
Am I doing something wrong or is there some sort of limitations ?
If I cannot get the shadows from multiple lights, is there a way to at least choose wich light will be used by the node ? Relying on the creation order isn’t a very robust solution…
The Lights.shadow output gives you the value of the last light in the scene, indeed. So, if this light has no shadow generator, you’ll get 1. I think this output was mainly intended for use in the case of a single light.
The ShadowOnly material also has this problem, which is why there’s an activeLight property: when you set a value, it rearranges the lights to ensure that the right light will be used by the shader.
To overcome this problem and handle the multi-light scenario, I wonder if we could add a new output like “AggregatedShadow” that would give you the % for the current pixel not in shadow, regardless of the number of lights (or even change “shadow” if we consider it to be a bug)…
