null and solid layering

Question

I'm editing a video and I created a solid and null object and it says they're attached, but the animation does not happen. In the video someone is using their finger to draw something. I have the null object following his finger, and it's all drawn out, but I want a line to stay on the screen to show the drawing from his finger...does that make sense? Think Disney logo's that they used to draw when they said "I'm Raven Symone from blah blah blah..." and drew the mouse head. I've done it before but it's not working now..any help?!

Rick Gerard · Answer

You either did not parent the right thing to the null, or you didn't use the right kind of expression, or you have some other switch turned off, or you are trying to have the null drag around some kind of brush - which AE won't do with the standard set of effects.

You can turn a motion path into a mask path, then apply Generate/Stroke and animate the start and end of the stroke. You can turn a motion path into a shape layer path and then use Trim Paths to animate the start and end of the line. You cannot turn a motion path or a mask path or a shape layer path into a Paint/Brush path.

So I have no idea at all how you are trying to have a finger draw a line on your frame. Please explain in detail or post a screenshot that shows us everything you have done to your layers by selecting the layers and pressing the u key twice.

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