Something like if you have an L_attack animation, and you want to mirror the movements to make it an R_attack?

Mirror Biped Animation in Autodesk 3ds Max

I couldn’t find anything about mirroring biped animation in 3ds max on net. What i find is there is a way to do it. Here is the way to do it. First of all select com of your biped or any bone…

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Mirror Biped Animation in Autodesk 3ds Max
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Here is the way to do it.

First of all select com of your biped or any bone of your biped.
Go to Motion panel.
Under Track Selection roll out select body vertical. De-select Figure mode if it is active.
Under Keyframing Tools roll out select Mirror. It is sometimes just mirror body pose but if you change selection to body vertical and body horizantel again you can make animation mirrored.

3dsmax - How to rotate/mirror a 3d animation? - Stack Overflow

Stack Overflow · stackoverflow.com

Create a dummy aligned to the root of your model. Link the root of the model to that dummy. With only the dummy selected, click the mirror button on the maintoolbar.

This will create a mirror image of the bones along with the animation on those bones. The only caveat is the names of the bones will also be mirrored. eg. the arm called 'right_arm' is now now on the left side.

If you need to preserve the animations to the original bones, look into using the animation mixer. This allows loading and saving animations onto characters. But it also has object mapping feature that allows objects of different names to load on saved animations.

So create a mapping. Save the mirrored animation. And load it back onto the original bones with that mapping.