On Christmas day I killed After Effects with sperm. I spent much of the day trying out a free software which allows the user to build a forward Kinematic rig which wags the tail when the base pin is rotated. This seemed like something I needed to play with, so I downloaded Duik Angela which is a freeware animation program for After Effects.
in Duik Angela, you add a line of pins in the tail as bones and then hit a button which links them together with some expression which moves them less near the base and more at the tip when the base pin is rotated. Though simple in theory, the results looked like a horrific twitching tail that had just been bitten off a lizard as it squirmed in the dirt. I experimented for hours trying to get some semblance of natural movement but finally had to give up.
At the end of the day I hand animated the tail in Callipeg. The animation took maybe half an hour. With the one tail animated and painted I imported it with a green screen into After Effects. I kept duplicating this green screen movie and moving the tail into position for each sperm. After duplicating the tail about 10 times the program seized up and the screen went black. Once again I pushed the program too far. Adobe programmers had not considered that a single clip might be duplicated so often.
I abandoned After Effects and went back to the original animation in Callipeg. I had already created several scenes with dozens of levels so I figure that program is more robust and will not crash. I have started duplicating tails and positioning them in that program since Adobe failed. I haven’t finished yet, but once all the tails are in place, I will turn off the background layer which consists of a tan field and the sperm heads. All the animation tails will then be exported together as a single green screen movie file. Adobe worked with the first few movie files so this single file should work.
The depth map distorts the background image to make it appear dimensional, so I may have to place pins at the bases of several tails to stretch then to where they need to be when the is scene animated with depth. I think all this might work, so now I need to make it happen.