Path of the scale without affecting the width of the line:

Hi all

This seems like it should be simple to do, but I'm not having any luck here. Basically I have a path akin to a null value which controls several things, their downward revision, turning and moving through the composition. One of these elements is a path with a stroke of 32 px.  I want to be able to reduce the path itself, but let the race the same.

I thought I could key the width of the line manually, but this has no effect - scaling upward does not seem that the path scales down to change the width of the line at all at the end keyframe, only to the first keyframe. I see the number of px start at 32 and increase until it moves along the timeline, even if the width of the line on the screen becomes even smaller as if there is no change at all to the width.

Thank you!

You don't want generally not scale the layer that contains the line, you want to add to the mask path keyframes and animate the size of the path. It's easy. You just start by double-clicking on one of the tops and using the processing area.

If this technique does not work for you, then you have two other options, the two expressions involving. These two options use exactly the same expression to examine the magnitude of your layer draw and both assume that the null value is scaling to 100% at the beginning of the animation. The option I would choose would be to replace the mask path on a layer at once applied with layer of form with applied outline path. You have many more options, and you're dealing with vector information. Another solution, it's the expression.

SF = thisComp.layer ("control Null 1").transform.scale[0]/100; ")

OV = value;

NV = ov / sf

SF (scale factor) is the scale value x control null which is the parent of the stroke layer or the layer with the edge effect applied to a mask divided by 100. If you plan to scale X and Y of the parent you will need to edit the expression, and then combine the scale factors and this solution will not work as well.  The original scale value is divided by 100 to make it a decimal value

OV (original value) is the initial value of the race.

NV (new value) is calculated by dividing the original value by the scale factor.

It is base of the 7th grade algebra. If your parent control is scaling less than 0 then the race will disappear because the value won't change a negative number. If it is necessary in your publication, you can write an if statement that will change the nv back to a positive number if the scale factor becomes less than or equal to zero and solve the divide by mistake you would get with a scale factor of 0-0.

One final point, and it's important. This expression will produce accurate results if applied to the size of the brush of a mask path when you use the effects > Generate > stroke effect to create your line but when bracts plus 100% of the line begins to fall apart and anti-aliasing will not be able to catch up with pixilation caused by scale. About 120% line will start to look slimmer and more than 140% Cela will look bad even if the width of the line is numerically accurate.

I'll let you take it from there.

Tags: After Effects

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