struct v2f -> declaration order

Hey hey,

I just stumbled across a problem I had some time ago, but there I managed to make it work without really understanding why...

It's about the order of variable declaration in v2f struct.

Code (csharp):

1. struct v2f {
2.     V2F_POS_FOG;
3.     LIGHTING_COORDS
4.     float2  uv;
5.     float3  viewDir;
6.     float3  lightDir;
7.     float3  normal;
8.     float3  tangent;
9.     float4  vertexColor;
10. };

With this order I get the following error:

When I change the order I don't get an error message:

Code (csharp):

1. struct v2f {
2.     V2F_POS_FOG;
3.     LIGHTING_COORDS
4.     float4  vertexColor;
5.     float2  uv;
6.     float3  viewDir;
7.     float3  lightDir;
8.     float3  normal;
9.     float3  tangent;
10. };

Is there a rule in which order I have to declare my variables?
Thanks in advance...

Jan

 

Thanks... I solved the problem by moving the LIGHT_COORDS all the way down. Now I don't get error messages when using TEXCOORD0 or COLOR0 anymore. But packing some things into float4s might be a good solution too... I'll try that next time.

Code (csharp):

1. struct v2f {
2.    V2F_POS_FOG;
3.    float2  uv : TEXCOORD0;
4.    float4  vertexColor : COLOR0;
5.    float3  view;
6.    float3  light;
7.    float3  tangent;
8.    LIGHTING_COORDS
9. };