Matrix4x3d.pick

Apply a picking transformation to this matrix using the given window coordinates <code>(x, y)</code> as the pick center and the given <code>(width, height)</code> as the size of the picking region in window coordinates.

@param x the x coordinate of the picking region center in window coordinates @param y the y coordinate of the picking region center in window coordinates @param width the width of the picking region in window coordinates @param height the height of the picking region in window coordinates @param viewport the viewport described by <code>[x, y, width, height]</code> @return this