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Expression to move camera at steady speed with slider control
Hi all.
I’m trying to do something rather simple but it’s breaking my head.I have a bunch of cameras at different positions in the timeline. They all need to move on the Z axis at a steady constant speed but at some point I need to stop one of the cameras.
So I’ve been using the script below, placed on each of the cameras.
It works perfectly but I’ve tried a number of ways to get the camera to stop but I can’t figure out how to determine the last value of the position applied by the script. It keeps going back to the original layer position.
Is there a way to move the position without using the “time” expression?
(something like currentPosition += 10 and then you can substitute the 10 with a slider or something like that 😛 )var CamSpeed = thisComp.layer("Adjustment Layer 1").effect("Cam_Speed")("Slider");
var PULL = value[2]-(time*CamSpeed);[value[0],value[1],PULL];
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4 Replies
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You could put a marker on the camera layer at the point that you want it to stop and use this expression
var CamSpeed = thisComp.layer("Adjustment Layer 1").effect("Cam_Speed")("Slider");var PULL = time < marker.key(1).time ? value[2] - time * CamSpeed : value[2] - marker.key(1).time * CamSpeed;
[(value[0], value[1], PULL)];
Andrei
My Envato portfolio. -
Thanks Andrei, really appreciate it.
OK please excuse my incompetence but I’m not getting the marker bit… I added a marker on the main timeline (shift+1, or even manually adding a marker with no name, also named it 1 manually) I also tried adding a marker on the actual camera where the script is situated but I keep getting the error: “expression result must be of dimension 3, not 1”
Am I missing something?
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It’s my mistake. I am sorry, the autocorrect on my text editor added parenthesis on the last lane for no reason. Here is the actual expression.
var CamSpeed = thisComp.layer("Adjustment Layer 1").effect("Cam_Speed")("Slider");var PULL = time < marker.key(1).time ? value[2] - time * CamSpeed : value[2] - marker.key(1).time * CamSpeed;
[value[0], value[1], PULL];
Andrei
My Envato portfolio. -
You sir are a legend. Thanks so much. Works perfectly ☺
Really appreciate it
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