Object shading problem when separating mesh (Head/Body)


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SACRIFICIAL
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Posts: 202

Object shading problem when separating mesh (Head/Body) Aug 11, 2024 17:31:35 GMT -5

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Post by SACRIFICIAL on Aug 11, 2024 17:31:35 GMT -5

Hello, I hope that you are doing well.
I am having a problem with an object's shading when separating the head from the body, instead of the head blending with the body correctly after separation, the blending disappears and the head becomes darker than the body:
Note that the issue doesn't happen before the separation.

Preview in Blender:

Shading issue in blender.

This is an object extracted using TS4 Ripper, and not a CAS item.

I was able to fix the problem in blender by applying the "Data Transfer" modifier to the head and body from the non-separated mesh, however, the issue was only solved in blender & not in game.

I also tried to weight transfer from the full unseparated mesh to both the head and body, and then removing the extra bones.
The reason why I am forced to separated them, is because the object is supposed to support full animation, and each mesh is only allowed to have a set amount of bones in order for them to work correctly, so I have a certain amount of bones in the head's mesh, and same thing for the body.

I tried to make this work first in Blender v3.3 then Blender v4.2 LTS but neither solved the problem unfortunately.

Link to .Blend File saved with Blender v4.2 LTS
The blend file includes the separated meshes, called "NatashaMunoz.Body" NatashaMunoz.Head" and the unseparated mesh called "NatashaMunoz", other meshes have no models and are only used for proper import to S4S.

Link to package saved with S4S v3.2.2.5 (Star)

Thank you in advance, I appreciate your time.

mauvemorn
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If you get no reply from me in 24 hours, please bump the thread

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Object shading problem when separating mesh (Head/Body) Aug 12, 2024 4:41:35 GMT -5 SACRIFICIAL likes this

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Post by mauvemorn on Aug 12, 2024 4:41:35 GMT -5

Hi. By default, everything in-game is shaded as smooth, which creates dark shadows along sharp edges. To make the game shade them as sharp, one must split them.
Since CAS items are often split into meshgroups in random places, their borders arent shaded as sharp, so there is no noticeable seam where body parts connect.
This does not seem to be the case for objects

Hi, andrew
Remember there was an issue of a seam on the cow's neck where one meshgroup met the other?Was that a bug or how it is meant to be? If a bug, is it fixed?

Anyway, you can remove inner seams on the body by merging them. Cant do this with the seam between two meshgroups, but you can put it where it makes sense for it to be:
- select the body, in edit mode select everything and Mesh - Merge - By distance;
- with everything still selected, Face - Tris to quads, enable Compare uvs;
- take a knife tool and cut along the borders of the top's texture. Once you create new edges, Edge - Mark as sharp;
- once you have an edge loop marked as sharp, you hover inside of it, press L, then switch to Sharp;
- Mesh - Separate - Selection;
- join with the head. It is affected by 41 bone, while the cleavage has only 8, so the limit is not exceeded.

To fix this issue along the hairline, you need to first delete the area of the scalp covered by the hair, then merge by distance

Last Edit: Aug 12, 2024 4:47:22 GMT -5 by mauvemorn

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SACRIFICIAL
Studio Member

Posts: 202

Object shading problem when separating mesh (Head/Body) Aug 12, 2024 13:53:21 GMT -5

Quote

Post by SACRIFICIAL on Aug 12, 2024 13:53:21 GMT -5

Aug 12, 2024 4:41:35 GMT -5 mauvemorn said:

Hi. By default, everything in-game is shaded as smooth, which creates dark shadows along sharp edges. To make the game shade them as sharp, one must split them.
Since CAS items are often split into meshgroups in random places, their borders arent shaded as sharp, so there is no noticeable seam where body parts connect.
This does not seem to be the case for objects

Hi, andrew
Remember there was an issue of a seam on the cow's neck where one meshgroup met the other?Was that a bug or how it is meant to be? If a bug, is it fixed?

Anyway, you can remove inner seams on the body by merging them. Cant do this with the seam between two meshgroups, but you can put it where it makes sense for it to be:
- select the body, in edit mode select everything and Mesh - Merge - By distance;
- with everything still selected, Face - Tris to quads, enable Compare uvs;
- take a knife tool and cut along the borders of the top's texture. Once you create new edges, Edge - Mark as sharp;
- once you have an edge loop marked as sharp, you hover inside of it, press L, then switch to Sharp;
- Mesh - Separate - Selection;
- join with the head. It is affected by 41 bone, while the cleavage has only 8, so the limit is not exceeded.

To fix this issue along the hairline, you need to first delete the area of the scalp covered by the hair, then merge by distance

Thank you so so much for your time and help, that did the trick!

I will follow your steps for the other meshes as well.

I appreciate you & I wish you a fantastic day 💓


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Object shading problem when separating mesh (Head/Body)

Post by SACRIFICIAL on Aug 11, 2024 17:31:35 GMT -5

Post by mauvemorn on Aug 12, 2024 4:41:35 GMT -5

Post by SACRIFICIAL on Aug 12, 2024 13:53:21 GMT -5

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