Rotation interpolation issues with .3DS import

[Anonymous]

Hi there.

I have a .3DS file that I have imported into 3DS Max. It contains a model (several objects connected to each other to form a full human body - for those who know, it's a Tomb Raider Level Editor Lara object), and an animation.

All meshes have a rotation key for every frame.

Only the root mesh has a position key for every frame.

The animation contains no other kind of key.

The animation plays fine when it is just imported.

Now my issue is that I want to remove some keys, so I can work only on a few poses and let the interpolation do the rest. Nothing spectacular here.

However, once I start removing keys, interpolation weirdness start to happen between keys of certain meshes.

See attachement to understand what I mean (I don't really know how to explain it).

I have no clue why this is happening nor how I could fix this.

Does anyone have any idea?

I'm not sure what kind of information you would need to understand the issue, so don't hesitate to ask for anything.

Thanks by advance.

[leeminardi]

Can you post a small segment of the max file with the keyframes and then note which keys you remove that yield the undesired behavior?

[Anonymous]

Here is the scene.

I've actually removed all the keys that can be removed without causing this behavior. If you remove any of the existing key (apart from the first and last one), at least one of the meshes will go crazy. (when I mean removing any key, I mean by selecting all meshes first)

Thanks for your help!

[leeminardi · Accepted solution]

I did the following which appears to fix the problem.

I selected the entire figure and deleted all the keys for frame 7.  The result was that the foot ( M003) had weird motion. I then unchecked the Rotation Windup option for M003.   This option allows for rotations of more than 360° (which you do not want).

 

[Anonymous]

Sorry for the (very) late reply.

This did the trick!

I'm wondering if this was this unticked by default in previous versions of 3DS? I don't remember having such issues when importing this same model in previous versions. Anyway I know how to fix it, this is the important part.

Thank you!