//-----------------------------------------------------------------------------// Edge_Mesh.fx////-----------------------------------------------------------------------------//-----------------------------------------------------------------------------// Parameters//-----------------------------------------------------------------------------float4x4 Transform : WorldViewProjection;float4x4 ModelWorld : World;float4 CamPosition : ViewPosition;float4 scale : ViewParm0 = float4(0.1,0.1,0.1,0.1); //-----------------------------------------------------------------------------// Structures//-----------------------------------------------------------------------------struct vertex{    float3 position	: POSITION;    float3 normal   : NORMAL;    float3 tangent  : TANGENT;	float  ridge    : TEXCOORD0;};//-----------------------------------------------------------------------------struct fragment{    float4 position : POSITION;	float4 color    : COLOR;};//-----------------------------------------------------------------------------struct pixel{	float4 color : COLOR;};//-----------------------------------------------------------------------------//-----------------------------------------------------------------------------// Vertex shaders//-----------------------------------------------------------------------------fragment VS( vertex IN ){    fragment OUT;	float4 WorldPos = mul( float4(IN.position, 1), ModelWorld );	float3 P = WorldPos.xyz; 		float3 N = mul(IN.normal, (float3x3)ModelWorld);	// world space face 1 normal	float3 T = mul(IN.tangent, (float3x3)ModelWorld);	// world space face 2 normal	float3 E = P - CamPosition.xyz;				// un-normalized world space eye to position	OUT.color = 0;	float EdotN = dot(E,N);		// positive for forward facing, negative for back facing	float EdotT = dot(E,T);		// positive for forward facing, negative for back facing	//float extend = 0.1 * (length(E) / 75);	float extend = scale.x * (length(E) / 75);	float3 newPos = IN.position + IN.normal * extend;	if ( ( EdotN * EdotT ) < 0 )		// silhouette detection	{		OUT.color.a = 1;			// make this visible		OUT.color.rgb = float3( 0, 1, 0 );		if ( EdotN > 0 )			// extend only the front facing vertices		{					// in the opposite direction			newPos = IN.position-IN.normal*extend;		}	}	OUT.color.a += IN.ridge;		// set visibility for ridges and valleys (pre-computed)	OUT.position = mul( float4( newPos, 1), Transform );	// output the final vertex position	return OUT;}//-----------------------------------------------------------------------------//-----------------------------------------------------------------------------// Pixel Shader//-----------------------------------------------------------------------------pixel PS( fragment IN ){	pixel OUT;	OUT.color = IN.color;	return OUT;}//-----------------------------------------------------------------------------// Techniques//-----------------------------------------------------------------------------technique EdgeMesh{    pass P0    {		AlphaTestEnable = true;		AlphaRef = 0x00000001;	      AlphaFunc = Greater;		VertexShader = compile vs_1_1 VS();		PixelShader  = compile ps_1_1 PS();    }}//-----------------------------------------------------------------------------