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XPresso Question – On/Off depending on direction
New day, new problem!
I have a pretty simple animation setup with some Xpresso Nodes which turn a screw and move it along it’s Y axis at the same time.
I have two sets of arrows on a ring to also indicate wether the screw is turning clockwise or counterclockwise.
Currently I have a User Data switch to control the visibility of either arrow.
Is there a way to setup something in my Xpresso Nodes which would turn on the visibility of the appropriate arrow when the User Data (Float slider) is increasing from 0% – 100% (and turning the screw clockwise). And then turn on the other arrow when moving the slider from 100% to 0%?
Thanks!
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3 Replies
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Another good puzzle! 😉
The key here is the Memory Node which allows you to look back in time and determine a parameters value in the past. Once you get that past value it’s just a matter of subtracting the it from the current value. Based upon whether the result is negative or positive you can tell if the object is rotating forward or backward.
File: 5920_rotationdirectioncontrolsvisibilitymemorynode.c4d.zip
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try using a Memory node to remember what the slider value was last frame then subtract one from the other and change the arrow depending if the answer is positive or negative – edit – Adam got there first 🙂
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Thanks Adam! Perfect! No way I would have figured that one out.
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