koobas.hobune.stream
Multiple Unity shaders based on a texture / material
Hi people :) I have a question ;)
Suppose I have 1 object, for example, an ax. Now this ax consists of different parts like the handle, the metal body etc. If I now the whole unwrap and texturize, then I use for the handle possibly a Holztexture, for the metal body logically irg. What iron similar and vllt I haul around the handle nor a leather strap just for visual appeal.
The whole thing I have in a 1024x1024 texture which has a material. Now I want to use a shader that makes the metal shine a bit. So in Unity, in the Standard Shader settings, I just set the Metallic Slider a bit higher. ---> Stupid !!!
Now my wood is suddenly shiny :( shiny metal beautiful and good but shiny wood or even worse a reflective leather strap ^^ rather uncool!
So my question is, how can I say that only the part of my UV map, which belongs to metal, should get the shiny / reflective shader and the rest of my object a matte shader?
Would like to avoid draw calls etc. like! Also too many materials would be nice. I want to get nice research paper with an ax with 3 materials -> does it affect the performance? And when I end up having 10 gameobjects all with 3+ materials ...
In the end I would like to have a texture atlas say 4096x4096 in which all my textures contain (wood, metal, leather, fabric etc.)
Does anyone have an idea how to get to the point?
Are you using Unity Standard Shader? In that case I guess you see the "Metallic" texture you can input. That texture sets how metallic something is. White is metal, black is non-metal. So in your case, your wooden handle is black in the metallic texture, your metal parts are white.
This is how the differnet textures may look: 
Some info about metallic workflow: https://docs.unity3d.com/Manual/StandardShaderMaterialParameterMetallic.html
So you need to create an additional texture which is black and white, where black is non-metal and white is metal and put it into the "Metallic" slot!
