Break Light Beams to Move Between 4 Camera Positions
Using this technique, you hit one button, the camera makes a smooth transition to a new position, hit another and it makes a transition to another camera position. Similarly, in the IDC, you were breaking light beams.
camA contains 6 channels representing simply one camera position. camB and camC contain other camera positions. A camera position includes its XYZ position, its 3 rotation angles and a lens zoom factor. Three ON-OFF channels are coming from keyboardABC, through logicABC and lag. They are used by the blendABC CHOP to blend the 3 camera poses in camA, camB and camC.
Here is the effect of the logicABC CHOP and the lag CHOP. The logicABC CHOP acts like a set of radio buttons where always one channel is ON (1) and all othes are OFF (0). Every time you hit another button, it stays ON and the rest are turned OFF. These are the upper 3 channels in the graph. The 4 light beams at IDC worked in this way. Then the lag CHOP makes the transition go smoothly from one state (camera position) to another. These are the lower 3 channels.