Extracting the mesh

[martintseng]

I am trying to export the 3d model as a OBJ file. Within the ViewController, I am using: scenePreviewVC!.scenePreviewVC!.scScene.mesh.writeToOBJZip(atPath: filePath), but it gives me a file that does not work.

However, exporting the point clouds work, by using: scenePreviewVC!.scScene..pointCloud?.writeToPLY(atPath: filePath).

However, I am not sure if I am using the correct method. If not, can you please tell me what would be the best way to extract the mesh into an OBJ file?

[inubushi]

I am trying to read the created GLTF files using other applications, but it does not seem to work. Is there any limitation as to which applications can open the GLTF files?

[pressanykeyplease]

I am trying to export the 3d model as a OBJ file. Within the ViewController, I am using: scenePreviewVC!.scenePreviewVC!.scScene.mesh.writeToOBJZip(atPath: filePath), but it gives me a file that does not work.

However, exporting the point clouds work, by using: scenePreviewVC!.scScene..pointCloud?.writeToPLY(atPath: filePath).

However, I am not sure if I am using the correct method. If not, can you please tell me what would be the best way to extract the mesh into an OBJ file?

Hey @martintseng I am facing exact the same issue. Have you figured it out?

[martintseng]

Hey, they have not yet fixed the method yet, so you cannot use it.

Best,

Martin

On Sun, Aug 13, 2023 at 9:08 AM Eduard @.***> wrote:

I am trying to export the 3d model as a OBJ file. Within the ViewController, I am using: scenePreviewVC!.scenePreviewVC!.scScene.mesh.writeToOBJZip(atPath: filePath), but it gives me a file that does not work.

However, exporting the point clouds work, by using: scenePreviewVC!.scScene..pointCloud?.writeToPLY(atPath: filePath).

However, I am not sure if I am using the correct method. If not, can you please tell me what would be the best way to extract the mesh into an OBJ file?

Hey @martintseng https://github.com/martintseng I am facing exact the same issue. Have you figured it out?

— Reply to this email directly, view it on GitHub https://github.com/StandardCyborg/StandardCyborgCocoa/issues/25#issuecomment-1676355597, or unsubscribe https://github.com/notifications/unsubscribe-auth/AG2WQHDGKSDXQQ7A5UFW5K3XVDGWLANCNFSM52CRBJPQ . You are receiving this because you were mentioned.Message ID: @.***>

[aaptho]

Hello @martintseng, does the mesh work if you export to PLY instead of OBJ? It’s possible there’s a bug in OBJ export. Can you provide more detail about what doesn’t work with OBJ export?

[martintseng]

Unfortunately, i dont have the details. I asked Standard Cyborg if they were going to fix it and they asked me to create an issue in github. i believe you can do the same and if enough people wants that function to be working, they will fix it.

Also, i think the whole method is bugged as its incomplete so you cannot fix it…

On Sun, Aug 27, 2023 at 1:00 AM Aaron Thompson @.***> wrote:

Hello @martintseng https://github.com/martintseng, does the mesh work if you export to PLY instead of OBJ? It’s possible there’s a bug in OBJ export. Can you provide more detail about what doesn’t work with OBJ export?

— Reply to this email directly, view it on GitHub https://github.com/StandardCyborg/StandardCyborgCocoa/issues/25#issuecomment-1694570526, or unsubscribe https://github.com/notifications/unsubscribe-auth/AG2WQHFVGQXPBFSY5LRUOVLXXLH5NANCNFSM52CRBJPQ . You are receiving this because you were mentioned.Message ID: @.***>

[pressanykeyplease]

Hello @martintseng, does the mesh work if you export to PLY instead of OBJ? It’s possible there’s a bug in OBJ export. Can you provide more detail about what doesn’t work with OBJ export?

Hi @aaptho thanks for reaching out! I am using a default UI from the example in the code. Here's how I save the file:

var objURL = documentsURL.appendingPathComponent("sample.obj")
scene.pointCloud?.writeToOBJ(atPath: objURL.path)

Exported OBJ file is empty - you can check an example file here.

However, seems like writeToUSDZ method works good, but I cannot use it because it is not a surface, but a collection of points. Please help

[pressanykeyplease]

Hey @aaptho how do you think, will this be fixed in the foreseeable future?

[aaptho]

The exported OBJ file you linked looks corrupted, not at all like any OBJ file this framework writes. You might want to run with address sanitizer or zombies enabled to verify nothing in your app’s memory has been corrupted.

If you want to export a mesh, first use SCMeshingOperation to generate a mesh, then write that result to PLY. writeToGLBAtPath might work for you too if you can use a GLB file, it’s worth a shot.

[aaptho]

It sounds like the core issue here is GLTF export not working. That is tracked by https://github.com/StandardCyborg/StandardCyborgCocoa/issues/28 I’m not sure why OBJ did not work for you both, but if you’re still able to reproduce, please comment with further detail and steps.