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Low Performance with the Subdivision Modifier
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Description

System Information
Operating system: Windows 10
Graphics card: Asus GTX 1080TI

Blender Version
Broken: blender-2.80-0f5b53ba4dc-win64

Low Performance with the Subdivision Modifier

With quality set to 1 the performance increases but is still very bad

Details

Type
Bug

Event Timeline

Wo!262 (wo262) added a subscriber: Wo!262 (wo262).EditedDec 2 2018, 1:08 PM

I noticed that some N gons go really slow. Please attach an example file

This comment was removed by Tobias Kuberka (Tobikubi).
Sebastian Parborg (zeddb) triaged this task as Needs Information from User priority.Dec 7 2018, 5:01 PM
Philipp Oeser (lichtwerk) closed this task as Archived.

Since last asking for information it has been 7 or more days, due to the policy of our bug tracker we will have to archive the report until the requested information is given.

Can I provide a blend file on their behalf?

Instructions: This is a 2.7 file, open on 2.79, and then on 2.8 git.8839152abf5
Turn on and off the subdivisions modifier of each cilinder, one by one, and compare the performance on both versions of blender, pressing play

I set up the scene to be 60fps so that's the baseline. In both 2.79 and 2.8, without subdivisions, the animation plays at 60fps

Subdividing the cilinder with just quads, at 4 levels and 1 quality, gives me 55ish fps in 2.79, and around 40fps in 2.8
Meanwhile, subdividing either the cilinder with Ngons or the one with triangles fan, goes from 60fps on 2.79, to around 20fps in 2.8. This is what I was refering to about slow Ngons, or vertices fanning lots of triangle faces

Philipp Oeser (lichtwerk) reopened this task as Open.
Philipp Oeser (lichtwerk) raised the priority of this task from Needs Information from User to Needs Triage by Developer.