Self Illuminated Vertexlit Shader with Vertex Alpha

Unity Engine
1

Hello,

I’m looking to extend the Self Illumin/Vertexlit shader to support vertex alpha and I don’t seem to be able to find the right combination of blending methods. I don’t quite understand the different passes and how they interact because I can either get one or the other, but not combined. Has anyone done this or knows if its possible?

Thanks

2 
Shader "Vertex/VertexLit Colored Alpha" {
Properties {
    _Color ("Main Color", Color) = (1,1,1,1)
    _MainTex ("Base (RGB) Trans (A)", 2D) = "white" {}
	_BumpMap ("Illumin (A)", 2D) = "bump" {}
}

SubShader {
    ZWrite On
    Alphatest Greater 0
    Tags {Queue=Transparent}
    Blend SrcAlpha OneMinusSrcAlpha 
    ColorMask RGB
    Pass {
        ColorMaterial AmbientAndDiffuse
        Lighting On
        SetTexture [_Bump] {
			Combine texture * constant DOUBLE, previous * primary
        } 
        SetTexture [_MainTex] {
            constantColor [_Color]
            Combine texture * primary DOUBLE, previous * constant
        } 		
    }
	Pass {
        ColorMaterial AmbientAndDiffuse
        Lighting On
        SetTexture [_MainTex] {
            constantColor [_Color]
            Combine texture * constant DOUBLE, previous * texture
        } 
		
    }
}

Fallback "Alpha/VertexLit", 1
}

196379--7085--$glow_532.jpg

3

Hi Graphicalgeek,

Thank you very much for sharing! :smile:

I have a probably stupid noob question. I saw you are handling _bump in the code.

Does this mean I can use bump-maps for iPhone, is there a performance cost?

Thanks so much,
Leander.

4

No, iPhone can’t render per pixel.

5

iPhone will do the dot3 combiner, which can be used for crappy object-space normal mapping.

6

on unanimated models only (on acceptable performance and correctness) due to the lack of cubemapping

7

Object space normal mapping doesn’t handle mesh deformation. It’s nothing to do with cube maps, though. Tangent space normal mapping requires a matrix multiplication per fragment, which can’t be done without fragment shaders.

8

thanks everyone for clarifying - highly appreciated :slight_smile: