spline tracking bug

spline tracking bug

To me it's a bug.

Please see attached .jas in case I'm not clear.

There is a camera going along a spline. Everything goes fine except for a glitch in the rotation of the cam at every spline key point.

Note : the spline is a primitive circle made editable with order reversed. No other change => the tangent having a constant 90° angle with the radius at all point of the circle, there should not be any glitches.

Thanks

p*

Hi,
please never but a camera into a folder. That's a quite old limitation of Cheetah3D. Camera objects always have to be highest level of the hierarchy.

Removing that limitation is already on my todo list.

Bye,
Martin

Hello, pierre.

I think this is a limitation of Spline tracking tag. you can use Target tag with Spline tracking tag for smooth circle or spline tracking.

I made sample from your file. please check at 2 sec point.

only spline tracking

spline tracking with target (target to Plane)

regards.

tg_jp

Thanks tg_jp, I may use target tag in case I encounter similar issue later on.

In the current case, it was very convenient for me to have a folder embedding the camera (several objects attached to it), so I tried using the circle primitive as a track and it worked fine.

Cheers,

p*

If you work with the spline tracking tag you can smooth the animation by decreasing the "approximation angle" property of the splines. It's best if you set them to 1.

Bye,
Martin

Martin said:

If you work with the spline tracking tag you can smooth the animation by decreasing the "approximation angle" property of the splines. It's best if you set them to 1.

Bye,
Martin

Click to expand...

Did that already. It works fine.

Thanks

p*