unity2018.4代码设置模型的rig面板avatar definition为copyformotheravatar

在Unity 2018.4中，可以使用以下代码将模型的Rig面板Avatar Definition设置为Copy From Other Avatar：

using UnityEditor;
using UnityEngine;

public class AvatarDefinitionSetter : MonoBehaviour
{
    [SerializeField] private Avatar sourceAvatar;

    private void OnEnable()
    {
        if (sourceAvatar != null)
        {
            var importer = AssetImporter.GetAtPath(AssetDatabase.GetAssetPath(gameObject));
            var modelImporter = importer as ModelImporter;
            if (modelImporter == null) return;

            modelImporter.animationType = ModelImporterAnimationType.Human;
            modelImporter.avatarSetup = ModelImporterAvatarSetup.CopyFromOther;
            modelImporter.sourceAvatar = sourceAvatar;
            AssetDatabase.ImportAsset(importer.assetPath);
        }
    }
}

请注意，上述代码需要将源Avatar分配给sourceAvatar变量。在Inspector面板中，将Avatar Definition设置为Copy From Other Avatar，并将Source Avatar设置为sourceAvatar变量所引用的Avatar即可。

另外，请确保模型的Rig面板是可编辑的（即，ModelImporter的Animation Type设置为Humanoid）。如果将Animation Type设置为Generic，则Rig面板的Avatar Definition将不可编辑。