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SEPTEMBER 17, 2003 Cinema 4D Techniques: XPresso Lite, Part 2
Prerequisites to set-driven keys While there are no real prerequisites limiting one numeric value control over a similar numeric value in simple set-driven keys, it is wise to keep certain mathematic concepts in mind before jumping in. A common problem in After Effects occurs when attempting to tie degrees (0-360) to a percentage (0-100%). Cinema is smarter than straight JAVA, by implementing Range Mapper automatically, XPresso understands that 360 equals 100 percent of a full revolution, or 100% when linked to a percentage bearing attribute like Brightness. What's more, C4D allows for lights to have a brightness value over 100%. (For alternate solutions see Cinema 4D forum and After Effects forum).[an error occurred while processing this directive]Ultimately, the prerequisite is: two parameters are required - A driver and a driven parameter. Setting driver and driven With the knob and light set in my scene, I'll use the knob as the driver, and the light as the driven. To find these parameters, first select the object which will act as a driver: the knob. In Attributes, select Coordinates to see the position, scale and rotation parameters. Cmd-Click (or right click) the parameter for "Y" rotation (H-heading). Under Animation, select Set Driver.  Next, select the driven. We want the brightness driven in this case, so we'll select the light and open the General parameters where the main brightness control parameter lives. CMD-clicking "Brightness" reveals the popup. Select Animation -> Set Driven (Absolute).  Prev 1 2 3 4 Next Related sites: • Animation Artist • AV Video • Creative Mac • Digital Animators • Digital Media Designer • Digital Post Production • Digital Producer • Film and Video Magazine • The WWUG Related forums: [an error occurred while processing this directive] 
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