Question What is the most straight forward way of cutting alpha with a texture mask?

Hi! I'm trying to make a cutout shader with a texture input which scales depending on another gameobjects scale & world position, to set alpha to zero inside the texture mask. In this case, the target of the shader is a wall, and the gameobject is a door. I don't want to use the uv because the uv on the target object could be arranged in any order. What is the most straight forward way of transforming the alpha mask to match another gameobjects world position and scale?

Any help/directions is appreciated.

 

You could use another graphic sample in the shader to define the mask area. Let's say we have another image to be the mask and black is where we want to discard and not black is where we want to draw; you can use it either way as to say only draw where color > 0 and/or discard where color == 0.

 

But wouldn't it use the wall's uv? I'm trying to not make it uv dependent, but dependent on another gameobject's world position transformed to scale it correctly.

 

The simplest way I can think of is have the other object prepared for any objects that could interact with it. I'm not sure of what you want to do but it sounds like you want a player to build a door on a wall. So if the wall is built in sections like this |---|---|---| and you want to put a door into the middle then you would have a sampler in the walls shader for a door and then cutout the door |---|- -|---|. Or maybe use a compute shader for the walls cutout sample that you update whenever a new change occurs.