Blender 2.79 & 2.8 - Limit Dissolve does not have the right 'Max Angle' when the Delimit mode is Material mode #58571

New Issue

Carlo Andreacchio · 2018-12-03T02:03:45+01:00

Carlo Andreacchio commented

2018-12-03 02:03:45 +01:00

System Information
Operating system: Ubuntu 17.10
Graphics card: GTX 1080

Blender Version
Broken: 2.79, 2.80 @ 23284e4dde, and 2.83 @ ec116e3d49

Short description of error
Limit Dissolve does not have the right 'Max Angle' when the Delimit mode is both Normal and Material

Exact steps for others to reproduce the error

limitDissolveBug.blend

Open attached blend file
Press x -> l to limit dissolve
In the tool options for limit dissolve, change it to Material Mode
Notice how the circle's form is lost
change the max angle to 0.015d
Notice how the form is somewhat tehre now, but the angle is definetly not 0.015d

This is the same with the modifier (decimate / planar decimation), as well as blender 2.79 & 2.8

**System Information** Operating system: Ubuntu 17.10 Graphics card: GTX 1080 **Blender Version** Broken: 2.79, 2.80 @ 23284e4dde, and 2.83 @ ec116e3d49 **Short description of error** Limit Dissolve does not have the right 'Max Angle' when the Delimit mode is both Normal and Material **Exact steps for others to reproduce the error** [limitDissolveBug.blend](https://archive.blender.org/developer/F5804179/limitDissolveBug.blend) 1. Open attached blend file 2. Press x -> l to limit dissolve 3. In the tool options for limit dissolve, change it to Material Mode 4. Notice how the circle's form is lost 5. change the max angle to 0.015d 6. Notice how the form is somewhat tehre now, but the angle is definetly not 0.015d This is the same with the modifier (decimate / planar decimation), as well as blender 2.79 & 2.8

Carlo Andreacchio commented

2018-12-03 02:03:45 +01:00

Added subscriber: @candreacchio

Carlo Andreacchio commented

2018-12-03 02:21:54 +01:00

{F5804179}whops forgot to attach the file! Sorry!

{[F5804179](https://archive.blender.org/developer/F5804179/limitDissolveBug.blend)}whops forgot to attach the file! Sorry!

Campbell Barton was assigned by Sebastian Parborg

2018-12-07 19:45:28 +01:00

Campbell Barton was unassigned by Dalai Felinto

2019-12-23 16:35:45 +01:00

Dalai Felinto commented

2019-12-23 16:35:45 +01:00

Added subscriber: @ideasman42

Sybren A. Stüvel commented

2020-02-10 16:56:49 +01:00

Added subscriber: @dr.sybren

Campbell Barton was assigned by Sybren A. Stüvel

2020-02-10 16:56:49 +01:00

Sybren A. Stüvel commented

2020-02-10 16:56:49 +01:00

I can reproduce this issue:

Before decimate:

After decimate:

I agree that the angles around the circle shape are much bigger than 0.015° after decimating. With an angle of 0.025° the circle is gone:

To illustrate, this is actually a single-arrow empty rotated 0.025° away from the Z-axis:

However, this could just be a misinterpretation of the "Max Angle". When you lift the green area up in the Z direction, everything starts working well. If the angle indicates curvature of the mesh (rather than angle between consecutive edges) the entire feature works just fine, and this is more a clarity/documentation issue than a bug in Blender.

I'll defer to @ideasman42 here, it looks like he implemented the feature.

I can reproduce this issue: Before decimate: ![image.png](https://archive.blender.org/developer/F8332672/image.png) After decimate: ![image.png](https://archive.blender.org/developer/F8332678/image.png) I agree that the angles around the circle shape are much bigger than 0.015° after decimating. With an angle of 0.025° the circle is gone: ![image.png](https://archive.blender.org/developer/F8332680/image.png) To illustrate, this is actually a single-arrow empty rotated 0.025° away from the Z-axis: ![image.png](https://archive.blender.org/developer/F8332684/image.png) However, this could just be a misinterpretation of the "Max Angle". When you lift the green area up in the Z direction, everything starts working well. If the angle indicates curvature of the mesh (rather than angle between consecutive edges) the entire feature works just fine, and this is more a clarity/documentation issue than a bug in Blender. ![image.png](https://archive.blender.org/developer/F8332697/image.png) I'll defer to @ideasman42 here, it looks like he implemented the feature.

blender-admin commented

2020-02-15 07:45:53 +01:00

This issue was referenced by d936f6977f

This issue was referenced by d936f6977fedaf5282c368bd32f545a76127770f

Campbell Barton commented

2020-02-15 07:57:16 +01:00

Changed status from 'Confirmed' to: 'Resolved'

Campbell Barton closed this issue

2020-02-15 07:57:16 +01:00

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Blender 2.79 & 2.8 - Limit Dissolve does not have the right 'Max Angle' when the Delimit mode is Material mode #58571