Curve to Mesh node creates wrong face orientation with cyclic profile curve #108848

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opened 2023-06-11 03:00:06 +02:00 by Pauan · 3 comments

Pauan commented

2023-06-11 03:00:06 +02:00

System Information
Operating system: Linux-6.1.26-x86_64-with-glibc2.37 64 Bits
Graphics card: AMD Radeon RX 6800 XT (navi21, LLVM 15.0.7, DRM 3.49, 6.1.26) AMD 4.6 (Core Profile) Mesa 23.0.3

Blender Version
Broken: version: 3.5.1, branch: Unknown, commit date: Unknown Unknown, hash: Unknown
Worked:

Short description of error
The Curve to Mesh geometry node creates incorrect face orientation when using a cyclic Profile Curve. This bug only happens with cyclic profile curves, non-cyclic profile curves work correctly.

Inside of the attached .blend file there are two identical curves. The left curve uses the curve Bevel option. The right curve uses the Curve to Mesh geometry node.

They should produce the same results, but they don't.

The Profile curve is just a standard Add -> Curve -> Circle.

Exact steps for others to reproduce the error

Open the attached .blend file.
Notice that the curve on the left has the correct face orientation.
Notice that the curve on the right has the wrong face orientation.

**System Information** Operating system: Linux-6.1.26-x86_64-with-glibc2.37 64 Bits Graphics card: AMD Radeon RX 6800 XT (navi21, LLVM 15.0.7, DRM 3.49, 6.1.26) AMD 4.6 (Core Profile) Mesa 23.0.3 **Blender Version** Broken: version: 3.5.1, branch: Unknown, commit date: Unknown Unknown, hash: `Unknown` Worked: **Short description of error** The `Curve to Mesh` geometry node creates incorrect face orientation when using a cyclic `Profile Curve`. This bug only happens with cyclic profile curves, non-cyclic profile curves work correctly. Inside of the attached `.blend` file there are two identical curves. The left curve uses the curve `Bevel` option. The right curve uses the `Curve to Mesh` geometry node. They should produce the same results, but they don't. The `Profile` curve is just a standard `Add` -> `Curve` -> `Circle`. **Exact steps for others to reproduce the error** 1. Open the attached `.blend` file. 2. Notice that the curve on the left has the correct face orientation. 3. Notice that the curve on the right has the wrong face orientation.

Cyclic Curve to Mesh.blend

107 KiB

Pauan added the

labels 2023-06-11 03:00:06 +02:00

Iliya Katushenock added

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labels 2023-06-11 10:15:10 +02:00

Pauan commented

2023-06-16 18:24:56 +02:00

Author

I was able to reproduce this bug even with a non-cyclic profile. Both the face orientation and rotation of the profile is wrong:

Open up the attached Non-Cyclic Curve to Mesh.blend file.
Notice that the left curve (Bevel) is correct.
Notice that the right curve (Curve to Mesh) is incorrect.

In addition to that, the Fill Caps option works with the Bevel curve, but it does not work with the Curve to Mesh node.

I was able to reproduce this bug even with a non-cyclic profile. Both the face orientation and rotation of the profile is wrong: 1. Open up the attached `Non-Cyclic Curve to Mesh.blend` file. 2. Notice that the left curve (Bevel) is correct. 3. Notice that the right curve (Curve to Mesh) is incorrect. In addition to that, the `Fill Caps` option works with the `Bevel` curve, but it does not work with the `Curve to Mesh` node.

Non-Cyclic Curve to Mesh.blend

105 KiB

Pauan commented

2023-06-16 18:35:49 +02:00

Author

Okay, I figured out what the problem is. When the Curve to Mesh node reads the Profile Curve, it's reading it upside down.

So if I add a Transform Geometry node to flip the Profile Curve upside down, then everything now works correctly (see the attached image).

Hopefully this should be an easy fix for Blender to make.

Okay, I figured out what the problem is. When the `Curve to Mesh` node reads the `Profile Curve`, it's reading it upside down. So if I add a `Transform Geometry` node to flip the `Profile Curve` upside down, then everything now works correctly (see the attached image). Hopefully this should be an easy fix for Blender to make.

Curve to Mesh Transform Profile.png

29 KiB

Iliya Katushenock added

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Nodes & Physics

labels 2023-06-16 18:39:46 +02:00

KohGeek commented

2024-03-17 04:11:39 +01:00

I'm on version 4.0.2 and this is still happening.

Flipping the Profile Curve upside down still works as a temporary fix.

I'm on version 4.0.2 and this is still happening. Flipping the `Profile Curve` upside down still works as a temporary fix.

Iliya Katushenock added

Nodes & Physics

and removed

labels 2024-03-17 06:51:19 +01:00

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