/// <summary>
/// Trnasforms the given direction from shading space into world space and normalizes it.
/// Assumes the shading normal is a valid normal (i.e. normalized).
/// </summary>
public static Vector3 ShadingToWorld(Vector3 shadingNormal, Vector3 shadingDirection)
{
SanityChecks.IsNormalized(shadingDirection);
ComputeBasisVectors(shadingNormal, out var tangent, out var binormal);
Vector3 dir = shadingDirection.Z * shadingNormal
+ shadingDirection.X * tangent
+ shadingDirection.Y * binormal;
return(dir);
}
/// <summary>
/// Trnasforms the given direction into normalized shading space.
/// Assumes that both the direction and the shading normal are normalized.
/// </summary>
public static Vector3 WorldToShading(Vector3 shadingNormal, Vector3 worldDirection)
{
SanityChecks.IsNormalized(worldDirection);
ComputeBasisVectors(shadingNormal, out var tangent, out var binormal);
float z = Vector3.Dot(shadingNormal, worldDirection);
float x = Vector3.Dot(tangent, worldDirection);
float y = Vector3.Dot(binormal, worldDirection);
return(new Vector3(x, y, z));
}
