Thanks for any advice!
And this, especially those lines that form the triangle and shorten then disappear at the very beginning
Maybe there's an easier way... Anyhow, I used 2 pictures for this: one of a line and one of a triangle.
1 - THE MOVING LINES
I created a comp I named "LINES" with the line pix duplicated twice (so I'd have it 3 times) and put the triangle underneath, just to help me position the lines.
I moved and turned each line so each would be on one side of the triangle, then I removed the triangle layer.
Next, I selected one line and drew a mask that covered about 2/3rds of the line. I activated keyframes for the position of that mask, and I moved it just before the line. Then I moved about 14 frames forward and moved the mask again so it was positionned just after the end of the line. BTW, to move the mask, I dragged the mouse over the "position" figures in the control panel. Dragging the mask on the viewer didn't change them (!?).
I did that for the two other lines.
2 - THE APPEARING TRIANGLE(S)
I could have done everything in the same comp, but I chose not to. So I created another comp ("TRIANGLE 1")in which I brought the picture of the triangle and duplicated it. I also put the "LINES" comp to help me position the triangles. Once that was done, I removed it.
...Well,if you'll excuse me... this is going to be a long explanation not everybody is interested in. I started typing and got carried away So, to make a long story short, the rest is mainly keyframing opacity, brightness, and afterwards, scale and hue.
Thank you so much! I'll try it out when I have time!
Here's the results
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