Parametric coordinates and subdivision modifier different in 2.80 as in 2.79 #60524

New Issue

Cédric · 2019-01-15T09:30:17+01:00

Cédric commented

2019-01-15 09:30:17 +01:00

System Information
Win 10
I7-5820K
GTX1080 ti

Blender Version
Worked: 2.79
Broken: 2.80, 84c06e996a, 2019-01-14

Short description of error
The quadratic gradient texture seems to be broken in 2.80.
In 2.79, using the parametric output with a gradient on a plane object with 1 level subsurf give me a quick way to have a gradient around all the edges.

Exact steps for others to reproduce the error
Load the blend file in attachment and render.

GradientTexture.blend

**System Information** Win 10 I7-5820K GTX1080 ti **Blender Version** Worked: 2.79 Broken: 2.80, 84c06e996a7a, 2019-01-14 **Short description of error** The quadratic gradient texture seems to be broken in 2.80. In 2.79, using the parametric output with a gradient on a plane object with 1 level subsurf give me a quick way to have a gradient around all the edges. ![Gradients.jpg](https://archive.blender.org/developer/F6293160/Gradients.jpg) **Exact steps for others to reproduce the error** Load the blend file in attachment and render. [GradientTexture.blend](https://archive.blender.org/developer/F6293091/GradientTexture.blend)

Cédric commented

2019-01-15 09:30:17 +01:00

Added subscriber: @Clarkx

Philipp Oeser commented

2019-01-15 10:59:08 +01:00

Added subscribers: @Sergey, @lichtwerk

Sergey Sharybin was assigned by Philipp Oeser

2019-01-15 10:59:08 +01:00

Philipp Oeser commented

2019-01-15 10:59:08 +01:00

The subdivision modifier seems to handle interpolation of Parametric differently [seems to not be interpolated but rather repeated over all generated geometry].
Not sure if this is actually correct in 2.79, but confirming for now and leaving up to @Sergey to decide...

The subdivision modifier seems to handle interpolation of Parametric differently [seems to not be interpolated but rather repeated over all generated geometry]. Not sure if this is actually correct in 2.79, but confirming for now and leaving up to @Sergey to decide...

Philipp Oeser changed title from ~~quadratic gradient texture different in 2.80 as in 2.79~~ to Parametric coordinates and subdivision modifier different in 2.80 as in 2.79

2019-01-15 11:02:19 +01:00

Jacques Lucke commented

2019-01-15 11:04:26 +01:00

Added subscriber: @JacquesLucke

Jacques Lucke commented

2019-01-15 11:04:26 +01:00

This is probably just related to the new subdiv modifier which apparently produces a different topology.
Personally I would not consider this a bug. The fact that it worked in Blender 2.79 seems to be a happy coincidence.
I would not depend on the Parametric output for anything for mesh objects.
Also EEVEE renders yet another pattern on the object.

Assigning to @Sergey because he has to decide if this is considered a bug or not.

[EDIT: damn, you were faster ^^]

This is probably just related to the new subdiv modifier which apparently produces a different topology. Personally I would not consider this a bug. The fact that it worked in Blender 2.79 seems to be a happy coincidence. I would not depend on the Parametric output for anything for mesh objects. Also EEVEE renders yet another pattern on the object. Assigning to @Sergey because he has to decide if this is considered a bug or not. [EDIT: damn, you were faster ^^]

Cédric commented

2019-01-15 11:14:10 +01:00

Ok, thanks a lot for the explanations and your hard work guys !
I will have to find another way to make this texture.

Ok, thanks a lot for the explanations and your hard work guys ! I will have to find another way to make this texture.

Brecht Van Lommel commented

2019-01-15 11:50:23 +01:00

Added subscriber: @brecht

Brecht Van Lommel commented

2019-01-15 11:50:23 +01:00

The better solutions for this is to create a UV map and Reset the UV coordinates. Then it works for all subdivisions levels.

Sergey Sharybin commented

2019-01-22 15:15:22 +01:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2019-01-22 15:15:22 +01:00

Sergey Sharybin commented

2019-01-22 15:15:22 +01:00

Such things are tricky to be preserved 100% compatibility, sooner or later exact match will be lost. As @brecht mentioned, using UV for such an exact control will work way more reliable.

Thanks for the report, but will not consider it a bug.

Such things are tricky to be preserved 100% compatibility, sooner or later exact match will be lost. As @brecht mentioned, using UV for such an exact control will work way more reliable. Thanks for the report, but will not consider it a bug.

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Parametric coordinates and subdivision modifier different in 2.80 as in 2.79 #60524