Blender FBX won't export Mesh Geometry converted from Curve with geometry nodes #108969

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opened 2023-06-14 12:09:53 +02:00 by Ludvik Koutny · 5 comments

Ludvik Koutny commented

2023-06-14 12:09:53 +02:00

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System Information
Operating system: Windows-10-10.0.22621-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 535.98

Blender Version
Broken: version: 3.5.1, branch: blender-v3.5-release, commit date: 2023-04-24 18:11, hash: e1ccd9d4a1d3
Worked: (newest version of Blender that worked as expected)

Short description of error
When creating meshes procedurally using geometry nodes modifier on a curve object, this object won't get exported by FBX exporter even if the result is a mesh, not a curve.

Exact steps for others to reproduce the error

Create a curve object
Add geometry nodes modifier, create new GN node network
Convert the curve to a mesh and add some topology (for example using curve fill)
Export this object using FBX
Result: The mesh is not exported
Expected: The mesh is exported

**System Information** Operating system: Windows-10-10.0.22621-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 535.98 **Blender Version** Broken: version: 3.5.1, branch: blender-v3.5-release, commit date: 2023-04-24 18:11, hash: `e1ccd9d4a1d3` Worked: (newest version of Blender that worked as expected) **Short description of error** When creating meshes procedurally using geometry nodes modifier on a curve object, this object won't get exported by FBX exporter even if the result is a mesh, not a curve. **Exact steps for others to reproduce the error** 1. Create a curve object 2. Add geometry nodes modifier, create new GN node network 3. Convert the curve to a mesh and add some topology (for example using curve fill) 4. Export this object using FBX Result: The mesh is not exported Expected: The mesh is exported

Ludvik Koutny added the

labels 2023-06-14 12:09:54 +02:00

YimingWu commented

2023-06-14 13:54:01 +02:00

Member

This is probably because the source object type is CURVE so the exporter skipped it before it's evaluated. Changes to object type is a new thing with GN, not sure how other parts of blender adapts to this.

cc @JacquesLucke @HooglyBoogly any ideas?

This is probably because the source object type is `CURVE` so the exporter skipped it before it's evaluated. Changes to object type is a new thing with GN, not sure how other parts of blender adapts to this. cc @JacquesLucke @HooglyBoogly any ideas?

YimingWu added

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labels 2023-06-14 13:55:22 +02:00

YimingWu changed title from ~~Blender FBX won't export Mesh Geometry if the source object is of curve type.~~ to Blender FBX won't export Mesh Geometry converted from Curve with geometry nodes

2023-06-14 13:56:05 +02:00

Hans Goudey commented

2023-06-14 14:00:24 +02:00

Member

Right, the FBX exporter should look for an evaluated mesh on CURVE objects rather than just skipping them. I'd probably say this is a bug with the exporter honestly.

Right, the FBX exporter should look for an evaluated mesh on `CURVE` objects rather than just skipping them. I'd probably say this is a bug with the exporter honestly.

Thomas Barlow commented

2023-06-14 14:47:09 +02:00

Member

Works for me in 3.5.1 (and 4.0.0a 2023-06-03 ab6860f3de0f).

Because the Object itself is a Curve, you will need the Other object type enabled, and because the Geometry Nodes are a modifier you'll need Geometry>Apply Modifiers enabled.

Works for me in 3.5.1 (and 4.0.0a 2023-06-03 `ab6860f3de0f`). Because the Object itself is a Curve, you will need the `Other` object type enabled, and because the Geometry Nodes are a modifier you'll need `Geometry`>`Apply Modifiers` enabled. ![image](/attachments/9736bfa5-aa3a-40cb-ab85-17dfb4ca3d37)

curveExportTest3.5.fbx

20 KiB

curveExportTest3.5.blend

104 KiB

38 KiB

Ludvik Koutny commented

2023-06-14 17:26:53 +02:00

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Contributor

Works for me in 3.5.1 (and 4.0.0a 2023-06-03 ab6860f3de0f).

Because the Object itself is a Curve, you will need the Other object type enabled, and because the Geometry Nodes are a modifier you'll need Geometry>Apply Modifiers enabled.

Ohh... "other"... that is very obscure :) Thanks.

I still think this should be done something about, as most people won't know that mesh geometry generated from curve falls into "other" export category.

> Works for me in 3.5.1 (and 4.0.0a 2023-06-03 `ab6860f3de0f`). > > Because the Object itself is a Curve, you will need the `Other` object type enabled, and because the Geometry Nodes are a modifier you'll need `Geometry`>`Apply Modifiers` enabled. > ![image](/attachments/9736bfa5-aa3a-40cb-ab85-17dfb4ca3d37) Ohh... "other"... that is very obscure :) Thanks. I still think this should be done something about, as most people won't know that mesh geometry generated from curve falls into "other" export category.

YimingWu commented

2023-06-15 06:34:40 +02:00

Member

Ah yeah looks like selecting "Other" and "Apply Modifiers" does fix the problem.

I still think this should be done something about, as most people won't know that mesh geometry generated from curve falls into "other" export category.

My suggestion would be checking curve type on evaluated objects during export, or we can simplify exporting options to have one "Geometry" type (which will include everything that's render-able, like mesh, curve, metaballs, etc)

Ah yeah looks like selecting "Other" and "Apply Modifiers" does fix the problem. > I still think this should be done something about, as most people won't know that mesh geometry generated from curve falls into "other" export category. My suggestion would be checking curve type on evaluated objects during export, or we can simplify exporting options to have one "Geometry" type (which will include everything that's render-able, like mesh, curve, metaballs, etc)

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