Scene Transition may be asymmetrical

[fredo6]

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.mov

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

Fredo

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

[driven]

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?

john