UNITY_MATRIX_MVP =? UNITY_MATRIX_M * UNITY_MATRIX_V * UNITY_MATRIX_P

Code (csharp):

1.  
2. Shader "Cg basic shader"
3. {
4.    SubShader
5.    {
6.       Pass
7.       {
8.          CGPROGRAM
9.  
10.          #pragma vertex vert
11.          #pragma fragment frag
12.  
13.          float4 vert(float4 vertexPos : POSITION) : SV_POSITION
14.          {
15.            
16.             //float4x4 myMatrix = UNITY_MATRIX_P * UNITY_MATRIX_V *  unity_ObjectToWorld;
17.             //float4x4 myMatrix = unity_ObjectToWorld * UNITY_MATRIX_V * UNITY_MATRIX_P;
18.             float4x4 myMatrix = UNITY_MATRIX_MVP;
19.             return mul(myMatrix, vertexPos);
20.          }
21.  
22.          float4 frag(void) : COLOR
23.          {
24.             return float4(1.0, 0.0, 0.0, 1.0);
25.          }
26.  
27.          ENDCG
28.       }
29.    }
30. }
31.  
32.  
33.  

Replacing line 18 with line 17 does not produce the same result. What am I misunderstanding?

 

Bah...
Multiplying matrices with * is not the same as using mul()

 

return vertexPos*myMatrix; ??
is not work for me!!

 

return vertexPos*myMatrix; ??
is not work for me!!

 

I mean ... you just quoted the answer to your question. Don't use *, use mul().