Vertex Fragment shader - Projector

Hello eveybody,

I am trying to create a simple Vertex Fragment shader for projector but I am facing some issues. In Orthographic mode the projection is perfect and resize according to the projector property.
Unfortunately, in perspective mode, the texture is docked in a corner of the projector and doesn't resize. Could you tell me what I am doing wrong ?

Thank you very much.

Code (CSharp):

1.            
2.             struct vertOut
3.             {
4.                 float4 pos : POSITION;
5.                 float2 uv : TEXCOORD0;
6.             };
7.            
8.             struct fragOut
9.             {
10.                 float4 col : COLOR;
11.             };
12.            
13.             vertOut vert(appdata_base IN)
14.             {
15.                 vertOut o;
16.                 o.pos = mul(UNITY_MATRIX_MVP, IN.vertex);
17.                 o.uv = TRANSFORM_TEX(mul(_Projector, IN.vertex).xy, _Mask);
18.                 return o;
19.             }
20.            
21.             fragOut frag(vertOut IN)
22.             {
23.                 fragOut o;
24.                 float4 mask = tex2D(_Mask, saturate(IN.uv));
25.                 o.col = mask;
26.                 return o;
27.             }

Here is an other solution which fixe the position and size in both mode but I can't avoid the repetition. The texture is not clamped.

Code (CSharp):

1.  
2.             struct vertOut
3.             {
4.                 float4 pos : POSITION;
5.                 float4 uv : TEXCOORD0;
6.             };
7.          
8.             struct fragOut
9.             {
10.                 float4 col : COLOR;
11.             };
12.          
13.             vertOut vert(appdata_base IN)
14.             {
15.                 vertOut o;
16.                 o.pos = mul(UNITY_MATRIX_MVP, IN.vertex);
17.                 o.uv = mul(_Projector, IN.vertex);
18.                 return o;
19.             }
20.          
21.             fragOut frag(vertOut IN)
22.             {
23.                 fragOut o;
24.                 float4 mask = tex2Dproj(_Mask, IN.uv);
25.                 o.col = mask;
26.                 return o;
27.             }

 

I just solved the issue by replacing :

Code (CSharp):

1. float4 mask = tex2Dproj(_Mask, IN.uv);

Code (CSharp):

1. float4 mask = tex2D(_Mask, saturate(float2(IN.uv.xy) / IN.uv.w));