/// Returns a matrix that converts to dst from Unity's axis conventions.
public static Matrix4x4 GetFromUnity(AxisConvention dst)
{
// Solve for M:
// M * (1, 0, 0) = ac.right (because 1,0,0 is Unity right)
// M * (0, 1, 0) = ac.up
// M * (0, 0, 1) = ac.forward
return(new Matrix4x4(dst.right, dst.up, dst.forward, new Vector4(0, 0, 0, 1)));
}
/// General-purpose conversion.
public static Matrix4x4 GetToDstFromSrc(AxisConvention dst, AxisConvention src)
{
// It doesn't really matter which system we pivot through, so use Unity
return(GetFromUnity(dst) * GetToUnity(src));
}
/// Returns a matrix that converts to Unity's axis conventions from src.
public static Matrix4x4 GetToUnity(AxisConvention src)
{
// transpose == inverse since these conversions are all orthonormal.
return(GetFromUnity(src).transpose);
}
