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After Effects Apprentice 05: Creating Transparency
Illustration by John Hersey

Setting the first vertex point


From:

After Effects Apprentice 05: Creating Transparency

with Chris Meyer and Trish Meyer

Video: Setting the first vertex point

If you have the Exercise Files that came with this lesson, I'm going to go back to my Comp panel, Close All, and then open up comp 03-Interpolation where I've already created a couple mask shapes for you. If you don't have the Exercise Files just sit back and watch. This is a fairly easy concept. Here I have a black solid where I've already created two different mask shapes at different keyframes. This first shape of a maple leaf and this second shape of an oak leaf, cool! Now since that keyframing going on, you would just assume this is going to interpolate between those two shapes, but look what happens when I RAM Preview.
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  1. 3m 17s
    1. Overview
      1m 17s
    2. Using the exercise files
      2m 0s
  2. 28m 53s
    1. Creating basic mask shapes
      5m 7s
    2. Using advanced parametric shapes
      3m 35s
    3. Basic mask shape editing
      4m 35s
    4. Masking in the Layer panel
      1m 55s
    5. Working with mask parameters
      4m 0s
    6. Animating masks
      5m 52s
    7. Creating vignettes
      3m 49s
  3. 25m 56s
    1. Masking with the Pen tool
      6m 44s
    2. Editing a mask path
      6m 19s
    3. Using RotoBezier masks
      4m 32s
    4. Targeting masks for animation
      3m 13s
    5. Setting the first vertex point
      5m 8s
  4. 19m 7s
    1. The basics of variable-mask feathering
      7m 33s
    2. Exploring variable-mask feathering options
      5m 56s
    3. Exploring visual effects applications
      5m 38s
  5. 7m 55s
    1. Exploring mask modes
      3m 58s
    2. Fading mask opacity
      3m 57s
  6. 11m 48s
    1. Using targeted treatments
      2m 35s
    2. Filling mask shapes
      3m 8s
    3. Following mask paths
      6m 5s
  7. 13m 31s
    1. Using alpha mattes
      3m 48s
    2. Grouping track matte pairs
      3m 40s
    3. Working with luma mattes
      3m 52s
    4. Animating mattes
      2m 11s
  8. 10m 0s
    1. Using Stencil Luma
      3m 5s
    2. Using Stencil Alpha
      2m 5s
    3. Using effects with stencils
      2m 20s
    4. Stacking stencils
      2m 30s
  9. 8m 23s
    1. Quizzler challenges
      1m 18s
    2. Quizzler solution one: One word at a time
      3m 53s
    3. Quizzler solution two: Stroke drawing direction
      3m 12s
  10. 11m 18s
    1. Idea corner one: More masks and effects
      2m 50s
    2. Idea corner two: Transition effects
      3m 44s
    3. Idea corner three: Sequenced layers as mattes
      4m 44s
  11. 16m 29s
    1. Understanding track matte rendering order
      5m 48s
    2. Exploring mask interpolation
      10m 41s

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After Effects Apprentice 05: Creating Transparency
2h 36m Beginner Mar 23, 2011 Updated Nov 15, 2012

Viewers: in countries Watching now:

In this course, Chris Meyer demonstrates the most common techniques for adding selective transparency to layers in After Effects through the use of masks, track mattes, and stencils. In addition to explaining the tools and basic theory behind transparency, the course covers several practical applications for these techniques, including isolating objects, creating vignettes, and filling text with visual texture. Tutorials on crafting custom transitions and other treatments are also included. Exercise files accompany the course.

The After Effects Apprentice videos on lynda.com were created by Trish and Chris Meyer and are designed to be used on their own and as a companion to their book After Effects Apprentice. We are honored to host these tutorials in the lynda.com Online Training Library®.

Topics include:
  • Creating masks using parametric shapes or freeform with the Pen tool
  • Editing and animating masks
  • Combining multiple masks
  • Using one layer to define the transparency of others
  • Explaining the interaction between effects, masks, and mattes
  • Mastering mask animation
Subjects:
Video Motion Graphics Visual Effects
Software:
After Effects
Authors:
Chris Meyer Trish Meyer

Setting the first vertex point

If you have the Exercise Files that came with this lesson, I'm going to go back to my Comp panel, Close All, and then open up comp 03-Interpolation where I've already created a couple mask shapes for you. If you don't have the Exercise Files just sit back and watch. This is a fairly easy concept. Here I have a black solid where I've already created two different mask shapes at different keyframes. This first shape of a maple leaf and this second shape of an oak leaf, cool! Now since that keyframing going on, you would just assume this is going to interpolate between those two shapes, but look what happens when I RAM Preview.

I press 0 on the numeric keypad. This leaf is turning in on itself. It's not at all animating the way I expected. What's going on? That's because After Effects really cares about the order that you draw mask points. It looks at the first point you draw for one shape and tries to interpolate that to the first point you drew for another shape. If those points don't line up, then you're going to get the weird inversions like this animation you just saw.

So ideally, when you have two very different mask shapes, you need to pay attention to where the first vertex point is so After Effects has a clue of how it's supposed to interpolate. So how do you figure that out? Well the first vertex point is the first point you drew when you drew the mask. You'll see it later as the point that has two rings around it rather than just a simple dot. So you see my maple leaf shape. It's down here at the bottom. That has the two rings. When I go to my oak shape, it's up here at the top.

That's the point with two rings around it. Ideally, you want these to be in the same location. So let's try a couple of different ideas. I'm going to start off by keeping this one at the bottom of the stem, go to my other point, and pick the bottom left point in that stem. Then I can either use Layer > Mask and Shape Path > Set First Vertex and now you see it has the two rings around it, or merely right-click on that point and I'll get these similar menu item.

Mask and Shape Path > Set First Vertex. Now let's see how that interpolates. That's fairly good. The stems staying correct, but since I have a different number of mask points, the maple leaf and oak leaf, it's not so good. Well you know you don't have to stick with one interpolation. You can try different first vertex points. In general, points at the very bottom, very top, or other identifiable marks and objects are good points to try.

So on this oak leaf, I'll select this top point. Right-click, Set First Vertex, I am going to type the shortcut J to go back to previous keyframe, select this first point, right-click, Set First Vertex. Let's see how that works. That holds the top shape better. The sides don't interpolate quite as well. So if you like, you can continue to try different ideas, such as making this point first vertex, K to jump to later keyframe, Set First Vertex.

That looks a little bit more natural. Using that point right off the base of the stem worked out pretty well. And if necessary you can play games with adding and subtracting points so you have similar vertex or mask points counts in either side to get a smoother interpolation. Well indeed, if you can pay attention to the Info panel you can get some clues. Here's my maple leaf. I'll select that first vertex. I see that there is 41 vertices on the maple leaf shape. I'll press K to jump to the next keyframe. Select that first vertex. 46 points on the oak leaf.

So the oak leaf has more points than the maple leaf. Let's see how this is interpolating. I see the maple leaf's top is crawling along the right side of the oak leaf. So it's a little bit unbalanced, like maybe there are not enough vertices on the right side of the maple leaf. Let's go ahead and hold down the G key when I've got the Selection tool active, and we just add a couple of points here and see how that goes. Oh, we're getting better. Let me add one more point. G, plus symbol, add.

Now I have a much better interpolation in-between those two different mask shapes. I'll press 0 to RAM Preview and now I've got a fairly good interpolation and I can play other games if I want to. There is a more advanced tool in After Effects called Smart Mask Interpolation where we can brute force masks to interpolate from one to another. I'll show that off on a sidebar at the very end of this lesson. But the main thing I want to show you was first vertex point. Very important in animating between two disparate shapes.

Find answers to the most frequently asked questions about After Effects Apprentice 05: Creating Transparency.


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Q: This course was updated on 11/15/2012. What changed?
A: We added a movie that shows our premium subscribers how to use the exercise files, We have also added new sets of exercise files designed for After Effects CS5.5 and After Effects CS6.
 
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