|
|
SEPTEMBER 17, 2003 Cinema 4D Techniques: XPresso Lite, Part 2
Hints and gotchas The difference between absolute values and relative values is fairly simple. Absolute takes the exact value of the set driver. If the rotation value is zero, our brightness will equal zero. [an error occurred while processing this directive]Relative allows you to add an offset before you apply the XP set driven tag. If the bulb's brightness is 30% before you apply a set driven (relative) tag, with rotation set at zero on the set driver knob, 0¼ will equal 30% and 100¼ will equal 130%. While there are some interesting animations you can develop using both of these driven models, be aware that the XP tag modifies the attributes of the driven object. Of course it does, that's what we want it to do. However, when you remove, or delete the XP tag, the object maintains the parameter change you made while it was under the influence of the XPresso formula (unless you have alternate animation keyframes set for that parameter). Tutorial Quick Tip Under the same Cmd-click window, there is a User Interface dialogue available for some values. If you prefer to drag a slider rather than enter the number in the edit field, you can choose "FloatSlider" or "FloatSlider(no editfield)"   There are so many uses for this simple tool, you can spend weeks just playing with Set Drivers and Set Driven attributes. If you have any interesting experiments you want to share, or questions about them, feel free to drop into the DMN Cinema 4D forum. Here is a simple animation with no keyframes at all. An expression, vibrate, controls the position of the master (black) cube, and acts as the set driver through the master cube's position parameter. The other cubes (red) are all set driven (relative)in size. This animation was set up in one minute. Ko Maruyama works with Cinema 4D in production and for fun. Currently, he's wrapping up a broadcast project which involved tons of XPresso that allowed the clients to see changes ripple throughout the scene with simple slider adjustments. If you have questions about XPresso, or any other C4D issues, check out DMN Cinema 4D forum. Ko is also an After Effects compositor whose advice and comment can be found in After Effects forum). Prev 1 2 3 4 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] 
|