Light Reveals Secondary Texture

Toth · Jul 2015

I'm looking for any help regarding finding or creating a very specific shader.

I have next to zero experience with shaders, so an help would be greatly appreciated.
The effect I'm looking for is present in Telltale's Wolf Among Us (See bricks in background).

The areas in light would be one texture, the areas in dark would be another. I've created two textures, one "lit texture" and one "shadow texture".I just need help finding or creating a shader for this effect.

I'm a environment artist trying to mimic a style, not a graphics programmer, so any help would be great, thanks!

EDIT: I've already found this, though I would need this to affect all lights in a scene. Also, I just didn't know where to start to try changing it to fit my needs.

ngw · Jul 2015

Essentially you need to use the value of light hitting a surface to lerp between the two textures.

Would be super easy in Shader Forge, if you access to that.

Toth · Jul 2015

I actually do have shaderforge, but I'm having trouble understanding how to hook up the nodes

Toth · Jul 2015

I've hooked the two textures up to a lerp and mapped the lerp's alpha to the light attention node, but now it is treating the "dark texture's" whites a transparency

Obscura · Jul 2015

The alpha of the lerp should be a light vector DOT normal vector.

Toth · Jul 2015

Is there a chance you could elaborate on that, I'm not fully grasping that idea. Can the vectors be accessed as nodes or are they separate scripts?

Obscura · Jul 2015

Obscura · Jul 2015

Advanced:

Toth · Jul 2015

Awesome! I got the shader to match yours in the shaderforge preview. However, when the shader is applied to a material and that material to an object, it doesn't seem to be affected by the light

Thanks for your help so far!

Toth · Jul 2015

After a bit more trial and error, it looks like the shader is only affected by the directional light, not spot lights or point lights. Looking for a way to remedy that now.

Any additional insight would be greatly appreciated

Obscura · Jul 2015

Interesting... You should try out "light position" instead of the light direction. Also maybe there are some details about what to do in such case, on the site of shader forge. If you find nothing, and the light positon doesn't help, then you can write to the creator's thread here.

http://acegikmo.com/shaderforge/nodes/
http://www.polycount.com/forum/showthread.php?t=123439&highlight=shader+forge

ngw · Jul 2015

Toth wrote: »

After a bit more trial and error, it looks like the shader is only affected by the directional light, not spot lights or point lights. Looking for a way to remedy that now.

Any additional insight would be greatly appreciated

In the shader properties on the left side of Shader Forge, open up the lighting tab : There is a toggle in there for "light count", make sure this is set to "multi-light".

You'll also want to multiply your lighting value with a "lighting attenuation" node, to account for light falloff/shadows.

Light Reveals Secondary Texture

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