How to mask a material/texture?

Hi-

Does anyone know how to mask a material and replace the masked part with a color.

Let's say I have a material on a 3D object, and I paint on it so now there are multiple colors. What I want to do is apply a white and black mask and remove parts of the color applied earlier.

Here is an example. This is the normal texture/material.


This is the mask.


After applying the mask I want to remove the color and still have the default color of the material where the mask was applied.



I found a shader online but it made the masked parts transparent and removed the lighting.

Thank you!

 

You could use a lerp to do that effect.
A lerp does a linear interpolation between two values using a third value as the interpolation weight.
https://developer.download.nvidia.com/cg/lerp.html

So you'd use your colour texture as one value. Then a colour property, in this case white, but it could just as easily be another texture or something. Then use the mask texture as the interpolation weight.

Something like

Code (CSharp):

1. col = lerp( tex, white, mask);
2. return col;

 

https://catlikecoding.com/unity/tutorials/rendering/part-3/
This tutorial teaches you to create a mask that selects one of two textures, which I believe is similar what you want.

 

Yep, this did it. Thank you

 

I tried experimenting with the project and I got pretty close but I found the lerp method which did the trick.

 

You can do that using the Unity shader graph

 

Hi, I'm a complete beginner with unity and would like to do something similar to the OP. Could you explain with a little more detail where I would use the lerp function? I'm not sure if I have to write a custom shader or something else? For context, I'm trying to generate cucumbers that have been randomly peeled and therefore have their original skin texture replaced with a flesh color. I currently have a prefab of a cucumber with the default texture, a dream of what I want, and no idea what I'm doing