Blend Two Textures in Vertex Shader .... I dont get it :((

Unity Engine
1

Hello Guys,

please help me, I stick at this issue for more than two ours, I just don’t get it. :frowning: .

I just want to extend this shader to have a “blend texture”, a black-and-white texture, that gets multiplied with the normal shader.

Just this:

1509523--85469--$Unbenannt-1.jpg
1509523--85469--$Unbenannt-1.jpg1751×633 226 KB

Shader "XXX" {
  Properties 
  {
		_MainTex ("Base (RGB)", 2D) = "white" {}
		_Color ("Main Color", COLOR) = (1,1,1,1)
		_Shininess ("Shininess", Range (0.01, 1)) = 1.0
  }

  SubShader 
  {
    Tags { "RenderType"="Opaque" }
    Pass {
	  Lighting Off
      CGPROGRAM
      #pragma vertex vert
      #pragma fragment frag

      #include "UnityCG.cginc"

      float4 _Color;
      sampler2D _MainTex;

      struct v2f 
      {
        float4  pos : SV_POSITION;
        float2  uv : TEXCOORD0;
      };

      float4 _MainTex_ST;
      float _Shininess;
      float _LinearPow;

      v2f vert (appdata_base v)
      {
        v2f o;
        o.pos = mul (UNITY_MATRIX_MVP, v.vertex);
        o.uv = TRANSFORM_TEX (v.texcoord, _MainTex);
        return o;
      }

      half4 frag (v2f i) : COLOR
      {
        half4 texcol = tex2D (_MainTex, i.uv) * _Color
        ;
        texcol.a = _Shininess;
        
        return texcol;
      }
      ENDCG
    }
  }
  Fallback "Diffuse"
}

Can someone please please show me how to include a black and white texture in the shader above so that it works like in the picture?

That would be so great !!! …

Thank you, …
valle

2

Or if your blend texture is all the same alpha use:

        texcol.rgb *= blendCol.rgb;
3

Hey Duney, Hey meh11,

thanks for your reply !
Unfortunately your solution doesn’t work - the whole shader just gets darkened. What’s wrong?? Do you need some UVs or something? :frowning: :confused:

thanks for your time !

EDIT: Maybe I should add that I use the shader for shader replacement for the camera calling Camera.RenderWithShader()
When I add the shader to a simple plane it seems to work.

4

I’m not sure about this, but it looks like the new shader isn’t using the same material properties as the original. How are you setting _BlendTex in the new replacement shader?

5

Hey jRocket, what do you mean exactly?
The new shader of meh11 uses a blend texture as a new property. but thats what I wanted. the problem is:
The shader doesn’t work for rendering the cam with shader replacement!

I dont know why, can somebody help me? :confused:

6

thanks meh11 !, now I understand what he meant!

Unfortunately its not working like expected… :frowning: Indeed I can see a black ring in the rendered image now as i wanted, but its not moving with the camera. It is just “printed” (fixed) on the geometry.

Let me explain it with this image:

The left part of the image is the rendertexture, that is being rendered with shader replacement. It’s getting updated every frame. I just want to “convert” it to the right image, so I just want to multiply the black-and-white “ring texture”, no matter whats being rendered.
I just wand to add that “black ring” on top of the rendered rendertexture! …

I would be glad if someone gives me a hint, I hope I don’t annoy you guys. I hope it’s now clear what I want to do.

Thanks! :confused:
Valle

7

Hey Guys,

thanks for your help but I think I’m going to solve it in another way. Shaders are **** me up :smile: :confused:

Thanks to all of you! :slight_smile: