Rotation limits

[Gorf]

I rendered out a shaded wireframe AVI of my chroegraphy - a landspeeder driving round a crater. Everything looked OK so I set it to work on a final, multipass version as a series of TGAs (for the alpha - the crater is "live action") and went to bed.

 

Just before the halfway mark, for three frames, there is a big jitter in the placement of the vehicle and its transparency. I think that it's something to do with the rotation around Y passing the 360 degree mark, and over the four passes it's coming out as a different position. I don't know why it should flash about the frame so wildly, though. There are no keyframes at that point.

 

I've attached a render of four seconds around the glitch - if anyone cares to suggest where I'm going wrong, I'll be grateful!

JITTER.MOV

[robcat2075]

can you put up a version of your project with proxies substituted for your models (and embedded in the PRJ)?

 

You'll have to put it in a zip to post it.

[KenH]

It seems like it's something other than the speeder. Camera? Light rig?

[Gorf]

It seems like it's something other than the speeder. Camera? Light rig?

Thanks, Ken. It's the camera. I was close, though, by thinking along the lines of the rotation limits... The Y rot is creeping up from -53deg at 0.4 degrees per frame. When it gets to -0.3 it doesn't go to +0.1 as might be expected, but -359.9. Then it resumes its creep up to zero at 0.4 degrees per frame. There's no effect from frame to frame without multipass because -359.9 is the same as +0.1. However, with multipass, the camera's near 360 degree spin in the space of one frame is what's causing the artefacts.

 

At least, in my novice's head, that's what is happening. I think it might be one for SynthEyes tech support... Thanks for the help.