Labels:book | monitor | reckoner | sky OCR: The interaction example allows direct manipulation of the control points of a quart triangular Bezier patch. Control points are selected as usual with the 2d mouse multiple points are selected bv "shift-clicking the mouse "dragged" while selected point, "triad mouse" operation begins. Triad mouse action ends when the user releases the button. The selected points are moved by the amount indicated between the starting and ending triad mouse locations Undo works for undesired movements A triangular Bezier surface patch is not an ideal user interface element: only its corner points directly affect the patch: interior parts of the patch are affected by weighted sums of control point locations; there are many control points; and the control polygon can become quite confusing However, used an exa ...
