TgluUnProject

type TgluUnProject = function(

  winx: GLdouble;

  winy: GLdouble;

  winz: GLdouble;

  const modelMatrix: TGLMatrixd4;

  const projMatrix: TGLMatrixd4;

  const viewport: TVector4i;

  objx: PGLdouble;

  objy: PGLdouble;

  objz: PGLdouble

):GLint;