Question Prefab Renders incorrectly in Subscene

Hi all,

I have a prefab that I want to Instantiate inside of ECS, however, when I Instantiate it, the prefab appears partially rotated?

While the end goal is to Instantiate it in a script, I have isolated the issue to simply rendering the prefab inside of a subscene.

The zombie on the right is added normally, outside of the subscene. The zombie on the left is added inside the subscene. This screenshot was taken without the game running, so no scripts are affecting the transform.

I'm new to ECS, but I'm starting to think this is a bug with skinned mesh renderers because the "debug plane" that I added is not modified/rotated - only the armature hierarchy.

To be clear: this also happens when spawning the zombie at run-time through the spawner/baking pattern.

Any suggestions on how to continue debugging this?

 

To isolate the issue further, I created a new project to recreate the behavior:

- Create HDRP project
- Install Entities 1.0.16
- Install Entities Graphics 1.0.16
- Install Netcode for Entities 1.0.17
- Import the following zombie asset: https://assetstore.unity.com/packages/3d/characters/humanoids/zombie-30232
- Convert all built-in mats to HDRP materials
- Create a subscene
- Drag the Zombie prefab from the asset into the subscene

Results in the following:

 

This is because character is a skinned mesh. To correctly render skinned meshes, deformation aware shader is required. How to create this shader is described here: https://docs.unity3d.com/Packages/c.../manual/mesh_deformations.html#material-setup

Must note that deformation aware shader must be set only to skinned meshes. Ordinary meshes will have rendering artifacts with this shader.

 

Hah! Of course you would have the answer Rukhanka I've been eyeing your ECS animation system for once I learn ECS a bit more extensively. Didn't realize just rendering basic skinned meshes uses experimental features.

Forgive me for the under-educated follow up question, but I haven't gotten to collision detection yet - Is the geometry of skinned mesh renderers considered when using Unity.Physics? (Unity.Physics is the solution for ECS collision detection, right?). Also, does your ECS Animation system integrate with Unity.Physics? For example if a raycast query collides with the geometry deformation result of an animation, would that be a hit?

 

Unity physics will work with Rukhanka in upcoming v1.4.0. It will not work with current version because Unity.Physics requires unparented Entity for its rigid bodies. But current version of Rukhanka requires strict entities bone hierarchy. v1.4.0 will lift this requirement:

 

Wonderful! I most certainly will be buying your asset in the next few days and eagerly looking forward to v1.4.0. Guess I'm off to learn Unity.Physics package.

For future reference, I confirmed Rukhanka solution worked for me. Video guide @ 45 seconds: