Is there a way to merge textures in Unity in a shader?
I'm trying to animate a 2D game object using several overlaid layers of images in one mesh renderer. I've got several layers of different textures, each is an image with a transparent background.
I've found a way to programmatically create a rectangular mesh and layer the materials within it with UV mapping. Unfortunately Unity now has to render each of these material layers separately, despite the fact that they are all within one mesh. This results in a very inefficient number of draw calls. I can see that each material now has it's own shader as well.
Will I need to edit all of my images into one gigantic image outside of Unity and display portions of them using UV mapping in a single material within the mesh?
Or is there some way to achieve this with a shader?
Solution
Create your own Shader (Code or ShaderGraph). Shaders can render multiple Textures (layers). You can blend by alpha/transprency however you like.
Edit: Example in ShaderGraph:
ShaderGraph Code: https://pastebin.com/a8ubgxRP
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