code: public static Point3D_F64 renderPixel( DMatrixRMaj cameraMatrix , Point4D_F64 X , @Nullable Point3D_F64 x) {
  		if( x == null )
  			x = new Point3D_F64();
  		ImplPerspectiveOps_F64.renderPixel(cameraMatrix, X, x);
  		return x;
  	}
docs: Render a pixel in homogeneous coordinates from a 3x4 camera matrix and a 3D homogeneous point.
  @param cameraMatrix (Input) 3x4 camera matrix
  @param X (Input) 3D point in homogeneous coordinates
  @param x (Output) Rendered 2D point in homogeneous coordinates
  @return Rendered 2D point in homogeneous coordinates