View and Projection Matrix

Please help me, I try to install the matrix manually, but it does not work, not visible object.

Matrix4x4 MVP = Camera.worldToCameraMatrix * Camera.projectionMatrix;
material.SetMatrix( "WVP", MVP);

In Shader:

Out.pos = mul( WVP, float4(In.vertex.xyz, 1.0));// not work
Out.pos = mul(UNITY_MATRIX_MVP, float4(In.vertex.xyz, 1.0)); //work

http://answers.unity3d.com/questions/5304/how-do-i-reproduce-the-mvp-matrix/5553#5553