need expresion to change opacity
Help, I'm creating a radar for a class project and I'd like the opacity of my "plane" layer to change whenever the radar "sweep" makes contact. I guess that would be a collision detection? Basically,...
View ArticleExpression to limit tracking data
Hello, Is there an expression to limit the scale of tracking data. In other words, I would like to take tracking data and reduce the size, so if I track my hand and it moves 10 inches up or down, I...
View ArticleMath.pow(Math.E, time)
Hi folks! The expression "Math.pow( Math.E, time )" keeps giving me a "divide by zero" error. This seems to be similar to problems others have had, but the other solutions don't quite work in my case,...
View ArticleClik here to view.
Orient to Camera Plus
Is there a way to keep a 3d layer always square to the camera, without any rotation? Normal 'Orient to camera' rotates the layers wildly. I want to achieve the look of the "Parallel to Cam Always"...
View ArticleHelp with 3D Layer Position Expression
Hi All, I do hope some one can help me – I have been looking and trying to solve this expression problem I have run in to - I only have limited expression knowledge. I need to move a layer in 3D space,...
View ArticleAccess Properties of a Layer Inside a Precomp
First time visiting these forums but they look like a super helpful place so any response is awesome. I'm trying to save myself some headache by creating one animation ("CircleIcon") and then using it...
View ArticleLinking a 2D layer to a 3D layer
Ok, i've come to my limitation of expression skills. I've setuped a 3D composition, with various elements at various depths. One of this element is a Sun. I setuped a camera to do a pan inside my 3D...
View ArticleLayer Space Transforms and Size
Hi, I have a 2D layer following a 3D layer using toComp in an expression, and its working really well. However, when the 3D layer gets closer to the camera, it appears as if its bigger, and I'd like...
View ArticleCheckbox Control using Expressions
Hi all, I'm trying to control the Mask Layer property in the Colorama plugin to always select the current layer. What I've done is created a Checkbox Control effect on the current layer to dictate that...
View ArticleAppending a "%" to numbers from a string
I have an expression that is working in animating a percentage based on a slider control. n=thisComp.layer("Null 1").effect("Pie Slice 2")("Slider") nRound=Math.round(n*10)/10; check = nRound % 1 if...
View ArticleInterpolating between Shape/Mask Paths
Hi, At 1:48 in this video, http://vimeo.com/36068222, this animator has the character's face moving horizontally by animating a mask. Looks pretty easy to do. What I'm wondering, is whether it's...
View ArticleCan't quite wrap my head around loopOut() ???
So at first I was confused and not sure if my next loop started immediatly upon the same frame as my last keyframe, or on the next frame after it? I've set up some simple expeiments and I'm pretty sure...
View ArticleHow to get relative position of layer in larger precomp.
The Setup: Comp 1 is 2000x3000 pixels. Comp 1 contains Layer X that is positioned at 1750,1250. (or whatever) I pull Comp 1 into Comp 2 which is 800x600. I scale and move Comp 1 inside Comp 2 by an...
View ArticleExpressions and Parents
I'm trying to create an expression that takes as its input the position of a layer in an animation. However, that layer is tracked to a null which is animated, rendering the...
View ArticleCancelling parent scaling in child
Any tips on getting a child to cancel out the scaling of its parent? The parent in this case scales X and Y differently, And I can't figure out how to anti-scale the child so it doesn't stretch. On...
View ArticleSettings that affect sampleImage()
I have a script that uses sampleImage to find whether there is any visible content within the composition (the script adds a layer and applys sampleImage to it). Somebody who is using the script is...
View ArticleParsing number text string to numeric value
If I have the number "5" as a text layer, how can I get another text layer to read that number, and then add another number to it? This gives me "56". I want "11". temp =...
View ArticleClik here to view.
Full auto-orient via expression
Hi! I'd like a 3D Null to get the orientation of 3D a layer. (without parenting, it would be too easy ) I've tried a lot of solutions, through orientation, rotations, both combined... some results are...
View ArticleExpression to control speed with the option to stop?
I made a simple animation with an expression to move a layer at a constant speed. With the Separate XYZ effect I used the expression time*120 on the X position. (120 is linked to a slider control but...
View ArticleChanging speed of a Quicktime layer based on speed of another layer
Hi everyone- I'm new to expressions.I'm trying to alter the speed of a layer of a quicktime movie. The speed at which it plays should reflect the velocity of another object. The faster that object...
View Article