Curve Display hides all curves/wires as soon as any part has faces [due to filling/extrude/etc] #76196

New Issue

Steve Warner · 2020-04-28T18:59:36+02:00

Steve Warner commented

2020-04-28 18:59:36 +02:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 436.48

Blender Version
Broken: version: 6da097136c
Worked: 6da097136c ^

Short description of error
Curves aren't showing up correctly in 2.83beta. In 2.82, complex curve objects (e.g. CAD plans) displayed fine. In 2.83, the curve object isn't displaying properly. See the image below.
This is because curves dont display any wires as soon as any faces are generated (due to filling in this case) and only display the faces instead

Exact steps for others to reproduce the error
CAD-Reduced.7z

Load a complex CAD plan in 2.82a.
Save the .blend file
Open in 2.83beta
Notice the difference

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 436.48 **Blender Version** Broken: version: 6da097136c Worked: 6da097136c ^ **Short description of error** Curves aren't showing up correctly in 2.83beta. In 2.82, complex curve objects (e.g. CAD plans) displayed fine. In 2.83, the curve object isn't displaying properly. See the image below. This is because curves dont display any wires as soon as any faces are generated (due to filling in this case) and only display the faces instead **Exact steps for others to reproduce the error** [CAD-Reduced.7z](https://archive.blender.org/developer/F8501591/CAD-Reduced.7z) Load a complex CAD plan in 2.82a. Save the .blend file Open in 2.83beta Notice the difference ![image.png](https://archive.blender.org/developer/F8499432/image.png)

Steve Warner commented

2020-04-28 18:59:36 +02:00

Added subscriber: @stevewarner

Ankit Meel commented

2020-04-29 08:36:17 +02:00

Added subscriber: @ankitm

Ankit Meel commented

2020-04-29 08:36:17 +02:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Ankit Meel commented

2020-04-29 08:36:17 +02:00

Can you add a minimal file that can help test it?
Also, if possible can it be redone with built-in objects. ?

Can you add a minimal file that can help test it? Also, if possible can it be redone with built-in objects. ?

Steve Warner commented

2020-04-29 19:35:58 +02:00

Here's a stripped down version of the file. It looks fine in 2.82a. Display is broken in 2.3 beta. But the data is still there. If you go into Edit mode, you can see it. Just not in object mode.

Thanks!

CAD-Reduced.7z

Here's a stripped down version of the file. It looks fine in 2.82a. Display is broken in 2.3 beta. But the data is still there. If you go into Edit mode, you can see it. Just not in object mode. Thanks! [CAD-Reduced.7z](https://archive.blender.org/developer/F8501591/CAD-Reduced.7z)

Ankit Meel commented

2020-04-30 09:32:13 +02:00

Added subscriber: @lichtwerk

Ankit Meel commented

2020-04-30 09:32:13 +02:00

6da097136c
CC @lichtwerk

6da097136c CC @lichtwerk

Ankit Meel commented

2020-04-30 09:32:33 +02:00

Changed status from 'Needs User Info' to: 'Confirmed'

Philipp Oeser self-assigned this 2020-04-30 09:50:46 +02:00

Philipp Oeser commented

2020-04-30 09:50:46 +02:00

Will check...

Philipp Oeser commented

2020-04-30 10:42:04 +02:00

Added subscriber: @Jeroen-Bakker

Philipp Oeser commented

2020-04-30 10:42:04 +02:00

Well, this obviously goes away if the 2D curves are not filled [Properties Editor > Curve > Shape panel > Fill Mode set to None]
In this file some parts of the curve object generate faces [due to success in filling] and some others dont [where filling isnt possible].

6da097136c disabled the wires/curves drawing whenever any faces would be generated (looks like this is a bit too 'agressive')
I think the goal should be to draw wires/curves for all parts that dont generate faces and dont draw them if we have faces.
Need to find a way to do this not on a per-object basis, but on a per-spline basis?
(there can always be splines that generate faces due to filling/extrude/etc and splines that dont in a single object)

If this turns out to be problematic to implement, it might be better to always draw curves/wires and faces at the same time...

CC @Jeroen-Bakker

Well, this obviously goes away if the 2D curves are **not** filled [`Properties Editor` > `Curve` > `Shape` panel > `Fill Mode` set to `None`] In this file some parts of the curve object generate faces [due to success in filling] and some others dont [where filling isnt possible]. 6da097136c disabled the wires/curves drawing whenever any faces would be generated (looks like this is a bit too 'agressive') I think the goal should be to draw wires/curves for all parts that dont generate faces and dont draw them if we have faces. Need to find a way to do this not on a per-object basis, but on a per-spline basis? (there can always be splines that generate faces due to filling/extrude/etc and splines that dont in a single object) If this turns out to be problematic to implement, it might be better to always draw curves/wires **and** faces at the same time... CC @Jeroen-Bakker

Philipp Oeser changed title from ~~Curve Display is Broken~~ to Curve Display hides all curves/wires as soon as any part has faces [due to filling/extrue/etc]

2020-04-30 10:44:10 +02:00

Philipp Oeser changed title from ~~Curve Display hides all curves/wires as soon as any part has faces [due to filling/extrue/etc]~~ to Curve Display hides all curves/wires as soon as any part has faces [due to filling/extrude/etc]

2020-04-30 10:46:18 +02:00

Philipp Oeser commented

2020-05-01 12:49:13 +02:00

I feel like this needs a design decission:

in which cases do we draw faces / wires / both ?
we could go with both (always): this report (#76196) would be closed, #59271 would be Invalid instead of resolved
we could keep as is (only draw wires if we dont have any faces) -- but make an exception for 2D curves with a Fill Mode other than None?

For the second case, see D7594: Fix #76196: Curve Display hides all curves/wires as soon as any part has faces [due to filling/extrude/etc]

I feel like this needs a design decission: - in which cases do we draw faces / wires / both ? - we could go with both (always): this report (#76196) would be closed, #59271 would be Invalid instead of resolved - we could keep as is (only draw wires if we dont have any faces) -- but make an exception for 2D curves with a `Fill Mode` other than `None`? For the second case, see [D7594: Fix #76196: Curve Display hides all curves/wires as soon as any part has faces [due to filling/extrude/etc]](https://archive.blender.org/developer/D7594)

Steve Warner commented

2020-05-01 16:33:01 +02:00

All good points. The reason this seemed like a bug to me is that I loaded in a curve object and didn't see all the curves.

The first thing I did was switch from Solid viewport rendering to Wireframe rendering, with the expectation that if this was a fill issue, Wireframe shading would reveal that. That's how Adobe Illustrator works. You have a Wireframe "Outline" view mode and a Solid "Preview" view mode that removes any fills and just shows the raw vectors.

It seems to me that the solution is this:

If a curve object's Fill Mode is set to anything other than "None," it should attempt to fill (where applicable) in Solid shaded mode.
If a curve object's Fill Mode is set to anything other than "None," it should NOT fill when in Wireframe shaded mode.

Wireframe shaded view takes away the polygons fill and only leaves the edges. It should do the same thing for curves.

All good points. The reason this seemed like a bug to me is that I loaded in a curve object and didn't see all the curves. The first thing I did was switch from Solid viewport rendering to Wireframe rendering, with the expectation that if this was a fill issue, Wireframe shading would reveal that. That's how Adobe Illustrator works. You have a Wireframe "Outline" view mode and a Solid "Preview" view mode that removes any fills and just shows the raw vectors. It seems to me that the solution is this: If a curve object's Fill Mode is set to anything other than "None," it should attempt to fill (where applicable) in Solid shaded mode. If a curve object's Fill Mode is set to anything other than "None," it should NOT fill when in Wireframe shaded mode. Wireframe shaded view takes away the polygons fill and only leaves the edges. It should do the same thing for curves.

Steve Warner commented

2020-05-28 02:01:23 +02:00

Any follow up to this? I tried loading the provided sample into the latest build (5/27/2020) and it's still not displaying correctly, whereas it does in 2.82a.

blender-admin commented

2020-05-29 13:10:26 +02:00

This issue was referenced by a87eee65fc

This issue was referenced by a87eee65fc768b7bc3c2f8c33d043b577f84f124

Philipp Oeser commented

2020-05-29 13:34:29 +02:00

In #76196#921660, @stevewarner wrote:
All good points. The reason this seemed like a bug to me is that I loaded in a curve object and didn't see all the curves.

The first thing I did was switch from Solid viewport rendering to Wireframe rendering, with the expectation that if this was a fill issue, Wireframe shading would reveal that. That's how Adobe Illustrator works. You have a Wireframe "Outline" view mode and a Solid "Preview" view mode that removes any fills and just shows the raw vectors.

It seems to me that the solution is this:

If a curve object's Fill Mode is set to anything other than "None," it should attempt to fill (where applicable) in Solid shaded mode.
If a curve object's Fill Mode is set to anything other than "None," it should NOT fill when in Wireframe shaded mode.

Wireframe shaded view takes away the polygons fill and only leaves the edges. It should do the same thing for curves.

Put up D7874: Fix #76196: Curve Display hides wires as soon as any part has faces [due to filling/extrude/etc] for review which does this

> In #76196#921660, @stevewarner wrote: > All good points. The reason this seemed like a bug to me is that I loaded in a curve object and didn't see all the curves. > > The first thing I did was switch from Solid viewport rendering to Wireframe rendering, with the expectation that if this was a fill issue, Wireframe shading would reveal that. That's how Adobe Illustrator works. You have a Wireframe "Outline" view mode and a Solid "Preview" view mode that removes any fills and just shows the raw vectors. > > It seems to me that the solution is this: > > If a curve object's Fill Mode is set to anything other than "None," it should attempt to fill (where applicable) in Solid shaded mode. > If a curve object's Fill Mode is set to anything other than "None," it should NOT fill when in Wireframe shaded mode. > > Wireframe shaded view takes away the polygons fill and only leaves the edges. It should do the same thing for curves. Put up [D7874: Fix #76196: Curve Display hides wires as soon as any part has faces [due to filling/extrude/etc]](https://archive.blender.org/developer/D7874) for review which does this

Philipp Oeser commented

2020-06-02 21:52:21 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Philipp Oeser closed this issue

2020-06-02 21:52:21 +02:00

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Curve Display hides all curves/wires as soon as any part has faces [due to filling/extrude/etc] #76196