This is a pretty simple effect. Use the pen tool to create shape layer (the line or path) with stroke only, no fill. Then add the Trim Paths effect and animate the start & end values (or the offset value).
The trim paths explanation is under the "Alter Shapes With Path Operations" sub-heading.
Here's direct link to the tutorial in Adobe's AE Help docs https://library.creativecow.net/articles/rabinowitz_aharon/Shape_Tips_3/video-tutorial
Simply draw a shape layer path and animte the Start and end parameters of a Trim Paths modifier. Or use a mask on a solid and the Stroke effect. This is really, basic simple stuff.
Hello, thanks for the reply, however, could you tell me step by step how to do it?
1) Goto New Composition
2) Get a New Solid shape
I am a beginner at this so please could you do step by step, so I can understand properly.
Type trim paths in the Search Help field at the top right corner of After Effects and you'll be taken to several tutorials and pages of information. It would take a long time to walk you through anything more than.
- Create a new composition
- Select the pen tool
- Click in the composition panel and draw a line
- Press the U key twice to reveal all of the properties of the shape layer
- Look for the little "add" button in the timeline next to the path properties
- Click the Add button then click Trim Paths
- Animate the properties in the trim paths properties that show up in the timeline when you add the effect
I second what Rick said.
Here's a good Youtube tutorial.
I typed "trim paths in after effects" to find it.
There were lots of search results but I am familiar with Mt Mograph and I know
their tutorials are very high quality.