How to set the connection relationship ,such as rotation relationship between 3 D files.Is the body connecting 3 D files a joint. How to set rotation constraints when a 3 D file is connected to a joint. Any examples. I want to make a wearable upper limb device and its effect on muscles.When the 3 D ...

I want to add a three-dimensional model to the bone, but it is wrong. I hope to provide some learning materials for adding a three-dimensional model. Thank you.