Blocky texture paint stroke interpolation #43571

New Issue

WK Bong · 2015-02-05T09:32:02+01:00

WK Bong commented

2015-02-05 09:32:02 +01:00

System Information
Custom build linux OS
Win 8.1 64 bit
GTX 980

Blender Version
Broken: ALL
Working: When this is fixed

Short description of error
on fast painting strokes, lines are blocky

Exact steps for others to reproduce the error

just paint fast strokes, either long or short, stroke will be blocky
Update rate just too slow, reminded me of old PC mouse back in the days

**System Information** Custom build linux OS Win 8.1 64 bit GTX 980 **Blender Version** Broken: ALL Working: When this is fixed **Short description of error** on fast painting strokes, lines are blocky **Exact steps for others to reproduce the error** ![BasePaint.blend1.png](https://archive.blender.org/developer/F141150/BasePaint.blend1.png) just paint fast strokes, either long or short, stroke will be blocky Update rate just too slow, reminded me of old PC mouse back in the days

WK Bong commented

2015-02-05 09:32:02 +01:00

Changed status to: 'Open'

WK Bong commented

2015-02-05 09:32:02 +01:00

Added subscriber: @WeeKwongBong

Julian Eisel commented

2015-02-05 15:24:19 +01:00

Changed status from 'Open' to: 'Archived'

Julian Eisel closed this issue

2015-02-05 15:24:19 +01:00

Julian Eisel self-assigned this 2015-02-05 15:24:19 +01:00

Julian Eisel commented

2015-02-05 15:24:19 +01:00

Hey @WeeKwongBong,
AFICS this is no bug, you can make this better by using the "Input Samples" value in the Stroke Panel.

So thanks for the report, but everything should work as expected :)

Hey @WeeKwongBong, AFICS this is no bug, you can make this better by using the "Input Samples" value in the Stroke Panel. So thanks for the report, but everything should work as expected :)

WK Bong commented

2015-02-05 18:11:42 +01:00

It is still blocky even at high samples.
At sample of >10, the smoothing is causing too much lag for comfortable painting.
The line only smooth at 30 input samples with too much lag.

left to right, 10 samples (blocky), 20 samples (still blocky with noticeable lag), 30 samples (too lag, cannot paint)

It is still blocky even at high samples. At sample of >10, the smoothing is causing too much lag for comfortable painting. The line only smooth at 30 input samples with too much lag. ![BasePaint.blend2.png](https://archive.blender.org/developer/F141233/BasePaint.blend2.png) left to right, 10 samples (blocky), 20 samples (still blocky with noticeable lag), 30 samples (too lag, cannot paint)

Julian Eisel commented

2015-02-05 18:19:17 +01:00

Added subscriber: @Psy-Fi

Julian Eisel commented

2015-02-05 18:19:17 +01:00

Yeah, but I'm afraid we're touching the borders of our old OpenGL code there. Am I right @Psy-Fi?

Antonis Ryakiotakis commented

2015-02-05 19:18:36 +01:00

It's actually an old issue that has to do with threading and small brush sizes:

If you use small brushes you might want to disable threading altogether by going to the performance panel and set threads to custom and 1.

See if that helps. I'll try to see if I can do something more for this issue.

It's actually an old issue that has to do with threading and small brush sizes: If you use small brushes you might want to disable threading altogether by going to the performance panel and set threads to custom and 1. See if that helps. I'll try to see if I can do something more for this issue.

Antonis Ryakiotakis commented

2015-02-05 19:19:00 +01:00

Changed status from 'Archived' to: 'Open'

Antonis Ryakiotakis reopened this issue

2015-02-05 19:19:00 +01:00

Julian Eisel was unassigned by Antonis Ryakiotakis

2015-02-05 19:19:08 +01:00

Antonis Ryakiotakis self-assigned this 2015-02-05 19:19:08 +01:00

Antonis Ryakiotakis commented

2015-02-05 19:19:08 +01:00

Added subscriber: @JulianEisel

WK Bong commented

2015-02-05 19:42:18 +01:00

Performance: 1 thread only
Input Samples at 10
Pressure is off

Thin strokes, can see the blocky part. Similar on larger brush.

Similar results when done with mouse, not graphic tablet problem.

![BasePaint.blend4.png](https://archive.blender.org/developer/F141259/BasePaint.blend4.png) Performance: 1 thread only Input Samples at 10 Pressure is off Thin strokes, can see the blocky part. Similar on larger brush. Similar results when done with mouse, not graphic tablet problem.

Antonis Ryakiotakis commented

2015-02-05 20:06:15 +01:00

Can you attach your test file here?

WK Bong commented

2015-02-05 20:11:54 +01:00

Blank file ready for painting.
BasePaintBR.blend

Blank file ready for painting. [BasePaintBR.blend](https://archive.blender.org/developer/F141262/BasePaintBR.blend)

Antonis Ryakiotakis commented

2015-02-05 20:21:18 +01:00

I am not sure if this is a bug either. Very fast strokes usually means we don't sample the mouse very often. As far as I've seen Krita and Gimp also have the issue but they hide it with some line smoothing.

I'll wait for the file and if I can't see anything extremely laggy I'll close. Better interpolation is nice to have but I wouldn't count it as a bug but a feature request.

We also have the smooth stroke system but personally I don't find it very comfortable to work with.

I am not sure if this is a bug either. Very fast strokes usually means we don't sample the mouse very often. As far as I've seen Krita and Gimp also have the issue but they hide it with some line smoothing. I'll wait for the file and if I can't see anything extremely laggy I'll close. Better interpolation is nice to have but I wouldn't count it as a bug but a feature request. We also have the smooth stroke system but personally I don't find it very comfortable to work with.

Antonis Ryakiotakis commented

2015-02-05 20:22:56 +01:00

Changed status from 'Open' to: 'Archived'

Antonis Ryakiotakis closed this issue

2015-02-05 20:22:56 +01:00

Antonis Ryakiotakis commented

2015-02-05 20:22:56 +01:00

Yep, can't see anything weird here, closing as TODO.

WK Bong commented

2015-02-05 21:08:05 +01:00

All the blocky grass part is caused by the same problem.

Smooth stroke cannot solve it. Start and end tapering by pen pressure are smooth out into dull ends.

Firealpaca has very nice way to taper line with smooth stroke. http://firealpaca.com/en
Mypaint also has very nice tapering, without smoothing. Very natural. (deevad/artpen is a good one)
Krita has the same problem as Blender texpaint (smoothing off). With "weighted smoothing," it becomes a joy to use. With nice tapering as well.

note: Fast strokes are useful to get nice smooth arc, slow strokes will get jaggy lines.

All the blocky grass part is caused by the same problem. ![View1.blend.png](https://archive.blender.org/developer/F141267/View1.blend.png) Smooth stroke cannot solve it. Start and end tapering by pen pressure are smooth out into dull ends. Firealpaca has very nice way to taper line with smooth stroke. http://firealpaca.com/en Mypaint also has very nice tapering, without smoothing. Very natural. (deevad/artpen is a good one) Krita has the same problem as Blender texpaint (smoothing off). With "weighted smoothing," it becomes a joy to use. With nice tapering as well. note: Fast strokes are useful to get nice smooth arc, slow strokes will get jaggy lines.

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Blocky texture paint stroke interpolation #43571