Scene Transition may be asymmetrical

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Scene Transition may be asymmetrical

Postby fredo6 » Tue Nov 14, 2017 9:52 pm

Working on Animator about interpolating Scene cameras as in Sketchup scene animation, I discover that in some cases the scene transition are not symmetrical.

In the attached model, by TDahl, transition:
- between Scene1 and Scene2 is symmetrical
- between Scene2 and Scene3 is symmetrical
- BUT between Scene3 and Scene4 is NOT SYMMETRICAL

Animator - Asymetrical Scene transitions.gif

Animator - Asymetrical Scene

I have tried to reconstruct a similar camera transition algorithm in Animator. The one I have, not yet released, is usually identical to Sketchup scene animation, except in some of these cases where the camera makes about a half turn. At least mine is symmetrical.

Has anyone encountered this weird problem?

I attach the model (SU2017), so that you can judge.
TDahl - Animator Camera Test.skp


EDIT: even more weird. The transition path from Scene 3 to 4 is not even always the same !!!
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Re: Scene Transition may be asymmetrical

Postby driven » Wed Nov 15, 2017 1:57 am

I recall an inconsistency based on the cameras relationship to the axis...

not sure if this is the same as it was many years ago...

my 'memory' tells me I avoided this by moving geometry and camera so you never crossed the axis...

it seemed that if any camera position included a negative, SU makes a decision whether to move clock or anti clockwise...

and it's not always the same decision...

does that make any sense?

learn from the mistakes of others, you may not live long enough to make them all yourself...

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