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3D Problem transforming vertices in RHW projection

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I have a big old project that cannot be converted from D3D_XYZRHW to D3D_XYZ.

The problem is whatever polygons around me distort, but everything in the distance is good.

It seems to happen when NDC space vertex.x <= 0.  I guess clipping must be the solution; but I don't know how.

Here is my current code.

VERTEX_DECL LocalToScreen( const Vector& vector ) {
	VERTEX_DECL vertex; = vector - Game::Eye; = Game::CameraOrientation * Game::ProjectionMatrix *; = /; = /; = 1.0 /;
        // This stops polygons around camera distorting; but it fully removes them which
    	//  is not a proper solution.  I think I need some kind of clamping.
	if ( vertex.z <= 0.0 ) {
		return vertex;
	} = * Game::HalfViewportWidth + Game::HalfViewportWidth; = * -Game::HalfViewportHeight + Game::HalfViewportHeight;
	vertex.rhw =; = * 0.000588; // Legacy.  This doesn't seem to do anything.

	return vertex;



Edited by scragglypoo

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