11 Replies Latest reply on Dec 26, 2012 2:40 PM by Todd_Kopriva

# Snap a vertex to the position of another vertex?

How do I snap a vertex to the position of another vertex with ease and rapidity, repeatedly, for many different vertices?

Seems like something that should be easy enough to do... but I can't.  The more I zoom in the nore opportunity I have to be smaller increments of wrong, rather than right about the position of the vertex I'm trying to temporarily (in time) place over the top of another.  (on same path)

• ###### 1. Re: Snap a vertex to the position of another vertex?

How do I snap a vertex to the position of another vertex with ease and rapidity, repeatedly, for many different vertices?

You use Illustrator to draw your shapes and copy&paste them.

Mylenium

• ###### 2. Re: Snap a vertex to the position of another vertex?

So how would I do it over time... using Illustrator?

In other words, so at one point in time the vertices overlap, perfectly, and at another point they do not.

I think, for future reference, being that we're in the After Effects forum ( a timeline based animation app ) that you can safely assume we're dealing with a time based problem when someone asks a question about positioning something.

• ###### 3. Re: Snap a vertex to the position of another vertex?

I'm confused as to what you're trying to accomplish. You can only zoom so far into the composition before it makes any difference (unless you're working with some effect that uses sub-pixel positioning. Are you trying to make two masks the same or just make two masks intersect at certain points?

• ###### 4. Re: Snap a vertex to the position of another vertex?

At a given point in time I want elements of the mask to completely disappear (not the whole mask, just portions of it) by overlapping some of its adjacent vertices ontop of one anther, perfectly.  And then, at other times, animate those points out so that they're back in their original position.  Consider a polygon shaped mask revealing it's fuller self over time, triangle by triangle.

• ###### 5. Re: Snap a vertex to the position of another vertex?

This seems like it'd be a lot easier to do with more than one mask. Is there a reason you can't add one or more masks in subtract mode?

• ###### 6. Re: Snap a vertex to the position of another vertex?

If you have grid snapping turned on when you create your masks, you should be able to do this somewhat...

• ###### 7. Re: Snap a vertex to the position of another vertex?

Yes, you can, if everything lands on a perfect grid.  However the corners of a perfect Hexagon rarely, if ever, actually land on a perfect pixel, so there's always some "leakage" if using the grid to snap to.

• ###### 8. Re: Snap a vertex to the position of another vertex?

How would this be easier with multiple masks?  they still don't snap to each other vertices?  So there's still the issues of absolute accuracy.  Actually even more problems come into play when using multiple masks in terms of accurate reveals and conceals because of the nature of how they're going to be slightly "askew" from the points of each other, even when designed to overlap.

• ###### 9. Re: Snap a vertex to the position of another vertex?

I may have misunderstood your intent. I'm not understanding the need for beyond-pixel-perfect accuracy.

• ###### 10. Re: Snap a vertex to the position of another vertex?

If a vertex is absolutely pixel snapped, then that's fine, pixel precision is enough.  But go ahead and draw a perfect Hexagon, now go find the position of the vertices... you'll find that none of them are pixel perfectly positioned, or two of them are and the rest are not.  That's the nature of drawing a equilateral hexagon.  So if I want to move one of the vertices of a perfect hexagon to the position of another, exactly, for a short period of time, I need to have sub-pixel snapping to that vertex.   This lack of snapping to vertices... is there someway around this?  Or do we wait another 15 versions of After Effects for Adobe to realise that this is a fairly rudimentry feature that might be useful for a range of situations?

• ###### 11. Re: Snap a vertex to the position of another vertex?

> Or do we wait another 15 versions of After Effects for Adobe to realise that this is a fairly rudimentry feature that might be useful for a range of situations?

That's what the feature-request form is for: