Shader wants texture coordinates, but the mesh doesn't have them

Question

Hey!

So, I'm working with a shader that I'm using with a mesh that I've generated in a script, using the graphics class, and the Graphics.DrawMesh() function. My trouble is that the shader I'm using is continually spitting out this message:

"Shader wants texture coordinates, but the mesh doesn't have them".

The shader doesn't seem to be malfunctioning -- I'm just using it to display a flat color. But What I'd like is to have the shader stop crowding my console with this message. The shader code is below -- what do I have to change to stop the shader from "wanting texture coordinates"? It doesn't seem to need them...let me know if there's something else you need in order to figure out the problem.

 Shader "Sprite/Vertex Colored" {
 Properties {
     _Color ("Main Color", Color) = (0.5,0.5,0.5,1)
     _MainTex ("Base (RGB) Trans (A)", 2D) = "white" {}
 }
 
 Category {
     Tags {"Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent"}
     ZWrite Off
     Blend SrcAlpha OneMinusSrcAlpha 
     SubShader {
         Material {
             Diffuse [_Color]
         }
         Pass {
             ColorMaterial AmbientAndDiffuse
             Lighting Off
             Cull Off
         SetTexture [_MainTex] {
             Combine texture * primary, texture * primary
         }
         SetTexture [_MainTex] {
             constantColor [_Color]
             Combine previous * constant DOUBLE, previous * constant
         }  
         }
     } 
 }
 }

Answer 1

Answer by nsxdavid · Mar 10, 2013 at 05:02 PM

Your shader is not just displaying a flat color, it's trying to use a texture (i.e. _MainTex). So the model must contain texture coordinates, which are added in the 3D application that authored the model, or some external app, via UV Mapping.

1 Show 2 · Share

Fattie · Mar 10, 2013 at 05:05 PM 0

Share

indeed. TBC, if you are building the mesh programatically you must of course create and set the UVs.

http://docs.unity3d.com/Documentation/ScriptReference/Mesh.html

http://docs.unity3d.com/Documentation/ScriptReference/Mesh-uv.html

the arcana of this is endlessly discussed on here!

Catlard · Mar 13, 2013 at 08:31 PM 0

Share

Hey guys! Thanks heaps. David, my old friend, you're right -- I just forgot. I am using a single white pixel as my texture to get a flat color effect. As far as creating and setting UVs, I actually would prefer not to do this, if it's going to save me memory. Because the drawing class I'm using this for needs to be maximally speedy. How would you recommend removing the need for UVs from this shader, then, Fattie? Is that even possible?

Shader wants texture coordinates, but the mesh doesn't have them

1 Reply

Your answer

Welcome to Unity Answers

Follow this Question

Related Questions