Motion Design – 03

Class 3 – Transitions, Trimm Paths, Mattes & Workflow

Last weeks project – planetary file

Before we head into this weeks main project we’ll go back to last weeks planetary file and add a comet flying through.

video coming soon

video coming soon

Animation Project – A to B

Sorting layers and organising project

Mask layers in background

Animate rough timing

Animate basic

Animate overshooting bend

Continuous loop of last keyframes

Grass animation slight bend left right with Math.sin()

Masks, Mattes and Transparency

In After Effects there are many ways to mask. You can mask a layer with a path, or another layer or with transition effects. You also can use Lightness/Color/etc. to add transparency to other layers.

Layer Mask

  • directly applied to layer
  • moves, scales, rotates with layer
  • layers can have several masks that can be combined in an additive or subtractive way
  • defined by paths
  • mask path can be animated
  • edge can be feathered
  • it’s fixed to the layer and will transform with it

Track Matte

  • separate layer acts as matte/mask
  • does not move or scale with masked layer but can be parented
  • can use alpha OR luma
  • both also inverted
  • matte layer can be animated separately
  • only one matte per layer and vice versa

Set Matte effect

  • separate layer acts as matte/mask
  • can therefore be applied multiple times and to multiple layers
  • can use alpha, luma, color channels, etc. for matte
  • matte layer can not be animated separately
  • hard to understand because matte transforms with layer if applied to a Pre-Comp or Solid and collapse transformations is off and does not transform with layer if applied to a Shape Layer or if collapse transformations is on

Stencil Alpha

  • masks ALL layers underneath in a comp
  • layers above are not affected
  • to get a background you’ll need to precomp eveything

Preserve Underlying Transparency

  • layer will only be visible where anything is already in any layer underneath
  • only works in Comps without background layer

Transition with wipe

You can also control layer transparency with “transition” effects like linear, radial or iris wipe and all other members of the wipe family.