Muscle Strand Helper

This 3ds Max script is designed to solve the problem of chaotic rotation of elements in a mirrored Muscle_Strand object. A typical CAT Muscle problem is this: when you copy a muscle from right to left or vice versa, mirror it, the mirrored copy starts to rotate involuntarily during animation. The reason for this, in short, is that the handles have the wrong angle of rotation. My script fixes this and also has several useful features for further work with CAT muscles.

Installation is standard: either drag and drop the file into the max window or call it from the Scripting menu via Run Script. Then you will find it in Customize User Interface - TannenspielScripts.

Important note: the script will not be able to eliminate rotation on its own if your bones, onto which you mirror muscles, are themselves mirrored and have negative values in scale. For this, before applying it, you will also need to mirror its base handles - START and End. Fixing this moment is difficult because you have to search through the entire chain of parent bones to see who was mirrored.