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Question by wlad_s · Jan 02, 2013 at 11:55 PM · colorchangetransparentshurikendiffuse

Why Shuriken "Color Over Lifetime" doesn't affect transparent materials?

Hi,

The question title is quite self-explanatory :) Shuriken doesn't affect color for transparent material. Why is this? At first, I thought that it changes _TintColor and not _Color so I changed that variable name in a transparent_diffuse shader. But it didn't help.

It also does nothing to a common diffuse shader.

How does shuriken access particle colors? Is this a bug or is there some unavoidable limitation that I'm not aware of?

Thanks.

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avatar image Screenhog · Jan 03, 2013 at 01:09 AM 0
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That's very interesting. I've never tried it before, but I just did the same thing in a test scene, and you're right. Now I'm curious too.

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Answer by mgear · Jan 03, 2013 at 12:58 PM

Not sure if I understood, but it works here, seems to affect vertex colors?

 Shader "Transparent/DiffuseTest2" {
 Properties {
     _Color ("Main Color", Color) = (1,1,1,1)
     _MainTex ("Base (RGB) Trans (A)", 2D) = "white" {}
 }
 
 
 SubShader {
     Tags {"Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent"}
     LOD 200
 
 CGPROGRAM
 #pragma surface surf Lambert alpha
 #pragma vertex vert
 
 sampler2D _MainTex;
 fixed4 _Color;
 
 struct Input {
     float2 uv_MainTex;
     float3 color;
 };
 
 void vert (inout appdata_full v, out Input o) {
   UNITY_INITIALIZE_OUTPUT(Input,o);
   o.color = v.color;
 }
 
 void surf (Input IN, inout SurfaceOutput o) {
     //fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
     fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * float4(IN.color.r,IN.color.g,IN.color.b,1);
     o.Albedo = c.rgb;
     o.Alpha = c.a;
 }
 ENDCG
 }
 }

  • _Color is not yet added to the c on that code yet

Original thread: http://forum.unity3d.com/threads/164653-Why-Shuriken-quot-Color-Over-Lifetime-quot-doesn-t-affect-transparent-materials

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avatar image wlad_s · Jan 03, 2013 at 01:07 PM 0
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It works great. Thanks mgear.

If anyone wants to use mgear's shader but with alpha support from shuriken, just change:

line 21: "float3 color;" to "fixed4 color;" line 31 to: fixed4 c = tex2D($$anonymous$$ainTex, IN.uv$$anonymous$$ainTex) * IN.color;

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Answer by Jameslewood · Feb 07, 2014 at 09:40 PM

You can also try using Sprites/Default as the shader.

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