   Rotating with HLSL code ?
  In The Name of God. Hi .I Want to flip my object . i have used this code for vertex shader:v2p vertexProgram (float4 normal:NORMAL,float2 tex:TEXCOORD0,float4 pos:POSITION){v2p output  = (v2p)0;///* Commented **////normal = mul(normal,WorldInverseTranspose);///* Commented **//output.normal = -normal;output.pos = mul(pos,wvp);output.tex = tex;return output;}But there is nothing as result , no changes will affect .I want also rotate my normals by this matrix with mul function :float4x4 rot = { {1.0 , 0.0 , 0.0 , 0.0}, {0.0 , 0.707 , -0.707 , 0.0}, {0.0 , 0.707 , 0.707 , 0.0}, {0.0 , 0.0 , 0.0 , 1.0}};please help .thanks in advance ....   
  output.pos = mul(-pos,wvp);mul( input.normal, rot );   ;  when i use mul(-pos , wvp) my screen turns to black .   