It’s probably the difference in rigging structure is why Mixamo dropped direct UE4 support. “Sometimes” you can retarget in UE4 to an “acceptable” result but for the most part it’s a “bang your head on the keyboard process” that is better done using an external application more suitable for the purpose of authoring animations and more so if attempting a retarget of two rigs structured differently. In the case of Mixmamo the rigging is based on the construct and naming convention of MotionBuilder so it does not require the zeroing out of the rotation transforms as it seems to be in use with the UE4 rig mannequin as well the joint rotations for twist is parented different so it’s not uncommon to have a joint rotation go off in unexpected directions as would be expected from an unmatched rig. The animation system in Unreal Engine 4 (UE4) is comprised of several Animation Tools and Editors which mixes skeletal-based deformation of meshes with morph-based vertex deformation to allow for complex animation. You can build a variety of indoor and outdoor environments, and new content is added regularly. Populate your Level with free content and props from Quixel Bridge. Old school wise setting up a BVH rig required the rig in the t-pose position followed up by zeroing out the joints rotation transforms so that the additive animation applied started out at zero. You can download premade characters from the Unreal Engine Marketplace, or use a MetaHuman instead. Yeah sorry to say this is a historic problem of being able to do a 1-1 conversion of animation data as there is always the problem of how the rigging was constructed as part of the original authoring of the animations.

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