I was having fun playing Serpiko's Close Encounters of the Third Kind table, and got wondering about how to do an animated roto-target in VP. After doing some tests, I asked Serpiko, and he was nice enough again to give me permission to mod another of his tables.
But the first step was just figuring out how the roto target was laid out and worked.

After a lot of googling, I never managed to find a full picture of it, but using a bunch of pics of part of it, and the code from Scapino's FP table, I eventually confirmed the layout. So I then drew it in Illustrator: (note: a day later, Serpiko gave me a pic of the whole wheel, so the moral of the story is to ask for help first!)
The rectangle at the center top of this is the only area that will be visible, but i started by drawing the whole wheel, figuring i'd decide how i'm gonna make it work later…

I then moved it to Photoshop, to try and figure out how to make it looks like it was spinning, using the smallest number of frames possible. Based on all the videos I've watched, it only spins counter-clockwise.
I still had to keep the target as the full circle in order to do radial blurs of it in Photoshop.
It has 15 arms on it, so dividing the 360° of it into 15 gives us 24° per target. So i did a radial blur on all the targets and made three versions of it, with an 8° progressive rotation of the wheel on each. So that would make three "spinning" frames, that could seamlessly loop and look like it's continually spinning, as long as I loop those 3 frames.
Here's what a few of them looked like, seeing the whole wheel.

After getting some good advice from Uncle Willy, I decided to do the whole viewable wheel as one drop wall. After listing all the permutations of how the wheel could be positioned, it turns out there's only 11 unique target combinations, even though there are 15 arms. So the plan was to crop to the viewable area I need, and make 11 pics for the possible combinations of the wheel itself, and 3 pics for the spinning animation.

I took 14 pics and put them on drop walls on top of each other, and scripted them to come up and down as necessary, using a timer and some custom code.
I'm pretty happy with how it turned out, and you can see it kind of crudely in this iPhone video:
Next up: some Photoshop tricks...
Edited by pinuck, 09 August 2012 - 05:42 AM.





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