void basicPassthroughTangent_v(float4 position : POSITION,
						float3 tangent       : TANGENT,

						  out float4 oPosition : POSITION,
						  out float3 oTangent  : TEXCOORD0,

						  uniform float4x4 worldViewProj)
{
	oPosition = mul(worldViewProj, position);
	oTangent = tangent;
}
void basicPassthroughNormal_v(float4 position : POSITION,
						float3 normal       : NORMAL,

						  out float4 oPosition : POSITION,
						  out float3 oNormal  : TEXCOORD0,

						  uniform float4x4 worldViewProj)
{
	oPosition = mul(worldViewProj, position);
	oNormal = normal;
}
// Basic fragment program to display UV
float4 showuv_p (float2 uv : TEXCOORD0) : COLOR
{
	// wrap values using frac
	return float4(frac(uv.x), frac(uv.y), 0, 1);
}
// Basic fragment program to display 3d uv
float4 showuvdir3d_p (float3 uv : TEXCOORD0) : COLOR
{
	float3 n = normalize(uv);
	return float4(n.x, n.y, n.z, 1);
}