Probuilder convert to mesh

Unity Engine
1

How do I convert the probuilder object to a mesh? (The opposite of ProBuilderize.)
I don’t want to export to hundreds of objects.
What I actually want is to create an assetbundle that doesn’t contain probuilder dependencies.

2

Found it! In the secret menu Tools > Probuilder > Action > Strip…

3 Likes
3

You can also use the “Export” action if you want to save your meshes to the Project directory. Use “Export Asset” or “Export Prefab” (the former only exports a mesh asset, while the latter saves the entire GameObject + Mesh).

4 Likes
4

Are there any way to convert from ProBuilder mesh to mesh(UnityEngine.Mesh) which can be used in script?

5

I’ve got solved.

                var mesh = new Mesh();
                mesh.SetVertices(pbMesh.GetVertices().Select(o => new Vector3()
                {
                    x = o.position.x,
                    y = o.position.y,
                    z = o.position.z,
                }).ToList());
                var indices = new List<int>();
                pbMesh.faces
                    .ToList()
                    .ForEach(o =>
                    {
                        indices.AddRange(o.indexes.ToList());
                    });
                mesh.SetIndices(indices, MeshTopology.Triangles, 0);
                mesh.RecalculateBounds();
                mesh.RecalculateNormals();
5 Likes
6

I want to do the same thing, but I also want the uv maps. Your code doesn’t pass on the uv maps, does it @minoaimino ?

7

Confirming this worked for me in case anyone else wants to know.

8

thanks thanks thanks!
unity plz update menual.

9

@kaarrrllll

Does not work with prefabs:

  1. When I run the “Strip…” command from the menu, it removes the script and the object seems to be fine, but when I exit prefab mode back to my scene and reopen the prefab, the changes are not saved. (Dirty flag is not set?)
  2. If I change some other properties on the object after the strip is done, and I save the changes then the prefab is modified, so the script is actually stripped, but the mesh has gone. So it’s a completely destructive operation for prefabs, sounds rather serious to fix it very soon.

Unity v2022.2.2f1.

Steps:

  1. Create a ProBuilder object
  2. Make a prefab out of it.
  3. Open the object in the dedicated prefab scene.
  4. Run the “Strip all Probuilder scripts in scene” command from the Actions menu.
  5. Change something on the object (e.g. move it away a bit from its original position to make it dirty)
  6. Press Ctrl+S
  7. Exit Prefab mode.
  8. Reopen the prefab in prefab mode.

Boom, the mesh has gone.
No Probuilder, no standard mesh, just a “[none] (MeshFilter)” caption on the inspector panel:
8749089--1185225--upload_2023-1-22_21-43-15.png

Edit: This feature is dangerous even with scene objects as the resulting object after a strip works though, but if you just drag and drop it to make a prefab out of it, it loses the mesh without any warnings. Basically breaks the standard Unity workflow when operating with prefabs in a data-destructing way.

6 Likes
10

This is a fairly common problem in Unity. You need to save the mesh as an asset somewhere. I looking around now to see what the nicest current solution is. I think this looks good https://github.com/pharan/Unity-MeshSaver

[edit] yes, it works in 2022.2 and it was written in 2018 so it should be backward compatible. You will need to save mesh as anew instance I think.

11

That’s correct, the strip action only removes the Probuilder component. It does not export a mesh asset outside of the scene. That is why I recommended using “Export Asset” or “Export Prefab.”

2 Likes
12

I have a bunch of generated prefabs using ProBuilder. How can I convert them to prefabs that use regular mesh filter and mesh renderer components from script?

In the source code I can see that neither the ExportAsset.ExportMesh is not accessible, neither the ProBuilderMesh.mesh field. So I cannot even reproduce the functionality of the ExportMesh(). Is it an intentional restriction? Seems very odd to me. Can anybody come up with a solution please?

1 Like
13

The editor action “Export Prefab” is doing roughly three steps:

  1. Create a mesh asset in the project from the selected Probuilder mesh. AssetDatabase.CreateAsset(probuilderComponent.mesh, path).
  2. Remove Probuilder-specific components. See com.unity.probuilder/Editor/EditorCore/StripProBuilderScripts.cs at e36600357d36d71689c5caaa75bfb42db10540cc · Unity-Technologies/com.unity.probuilder · GitHub. There is no convenience method for this, but it boils down to setting ProBuilderMesh.preserveMeshAssetOnDestroy and then destroying any ProBuilder components you don’t want to be a part of the prefab.
  3. Unity - Scripting API: PrefabUtility.SaveAsPrefabAssetAndConnect to replace the target GameObject.

You can reference the source here, com.unity.probuilder/Editor/MenuActions/Export/ExportAsset.cs at e36600357d36d71689c5caaa75bfb42db10540cc · Unity-Technologies/com.unity.probuilder · GitHub. This does a lot of extra boilerplate to handle various cases, but the core is what I’ve described above.

Alternatively, just clone the Probuilder repo, embed it in your Project/Packages directory and make whatever you need public.

1 Like
14

Hi !
Sorry to necro,
I had more or less the same problem, I needed a copy of a probuilder mesh, I tried UnityEngine.ProBuilder.MeshUtility.Compile but strangely it generated more vertices. So I ended up just doing a basic Instantiate and it works perfectly.
mesh = Instantiate(meshFilter.sharedMesh);

@kaarrrllll do you know why MeshUtility.Compile generates more vertices ?
Thanks in advance!