Shadow map creation is not a post process shader, so that question doesn't make sense.

Then thats why I'm having difficulty, because my shadowmap is created as a post process shader. My shadowmap RTT is declared inside my post process shader and that shader then processes each vertex in the scene. But it sounds like this is wrong and I need to declare the RTT in my program and pass it to every object shader to get updated, then pass the final shadowmap texture to the post process shader. Is that the way it's meant to work?

my shadowmap is created as a post process shader

You mean it's a render target you render to after you've rendered the scene from the main camera's perspective? Because that would be true. If you're doing forward rendering you would need to have the shadow map ready when you're rendering and lighting the scene, but in a deferred setup you could do it afterwards (before applying lighting).

1. Render the scene with colors and all to render target 1 (or MRTs). For models with alpha textures, bind those textures and discard accordingly.

2. Render scene's depth from a light's perspective into render target 2 (shadow map). For models with alpha textures, bind and discard.

3. Apply lighting based on data in g-buffers + shadow map.

Forward rendering: first do step 2, then 1 and 3 combined.

Hello Im home now this is what I do im my shadow fx file

void PS(VS_OUT pIn)
{
float4 diffuse = gDiffuseMap.Sample( gTriLinearSam, pIn.texC );

// Don't write transparent pixels to the shadow map.
clip(diffuse.a - 0.15f);
}