SSAO doesn't scale gracefully #51216

New Issue

Sterling Roth · 2017-04-14T22:47:28+02:00

Sterling Roth commented

2017-04-14 22:47:28 +02:00

System Information
Windows 7 + 10, Geforce graphics

Blender Version
2.78c and earlier

Short description of error
The SSAO implementation in the viewport is really clean, unless you increase the scale too much. I work in inch scale to interface better with imported CAD models, but when I'm dealing with objects that are > 1000BU in any dimension, having the ao distance set to .1 doesn't really help. Increasing the distance slider works ok, but the sampling becomes very hideous very quickly.

Attached are 2 screenshots of the viewport with a pallet model. The pallet's dimension are: 40x48x5 BU. I have the AO distance set to 10 to get some shading in between the slats, but the sampling is total static:

If I scale everything down by a factor of 10 (object, ao distance and strength) the AO is smooth as butter:

I understand that the SSAO implementation isn't a magic bullet, but if there were some way to scale it up more, that would help me out a ton.

Exact steps for others to reproduce the error
Add a suzanne
Turn on SSAO
Observe SSAO quality

Scale Suzanne 10x
Scale SSAO strength and distance 10x
Observe SSAO quality

**System Information** Windows 7 + 10, Geforce graphics **Blender Version** 2.78c and earlier **Short description of error** The SSAO implementation in the viewport is really clean, unless you increase the scale too much. I work in inch scale to interface better with imported CAD models, but when I'm dealing with objects that are > 1000BU in any dimension, having the ao distance set to .1 doesn't really help. Increasing the distance slider works ok, but the sampling becomes very hideous very quickly. Attached are 2 screenshots of the viewport with a pallet model. The pallet's dimension are: 40x48x5 BU. I have the AO distance set to 10 to get some shading in between the slats, but the sampling is total static: ![100PERCENT SSAO.jpg](https://archive.blender.org/developer/F545675/100PERCENT_SSAO.jpg) If I scale everything down by a factor of 10 (object, ao distance and strength) the AO is smooth as butter: ![10PERCENT SSAO.jpg](https://archive.blender.org/developer/F545676/10PERCENT_SSAO.jpg) I understand that the SSAO implementation isn't a magic bullet, but if there were some way to scale it up more, that would help me out a ton. **Exact steps for others to reproduce the error** Add a suzanne Turn on SSAO Observe SSAO quality Scale Suzanne 10x Scale SSAO strength and distance 10x Observe SSAO quality

Sterling Roth commented

2017-04-14 22:47:29 +02:00

Changed status to: 'Open'

Sterling Roth commented

2017-04-14 22:47:29 +02:00

Added subscriber: @SterlingRoth

Sterling Roth commented

2017-04-14 22:56:32 +02:00

Even cranking up the sample count doesn't clean up the static:

Even cranking up the sample count doesn't clean up the static: ![100PERCENT SSAO - oversampled.jpg](https://archive.blender.org/developer/F545682/100PERCENT_SSAO_-_oversampled.jpg)

blender-admin commented

2017-04-15 00:02:55 +02:00

This issue was referenced by e280c70aa9

This issue was referenced by e280c70aa942829e7bfbd403fbb971a3c4502821

Brecht Van Lommel commented

2017-04-15 00:46:56 +02:00

Changed status from 'Open' to: 'Resolved'

Brecht Van Lommel closed this issue

2017-04-15 00:46:56 +02:00

Brecht Van Lommel commented

2017-04-15 00:47:51 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2017-04-15 00:47:51 +02:00

The issue is that the Strength needs to be set that high to compensate for the Attenuation being broken. After the fix it should be possible to get good results by only adjusting the Distance.

Sterling Roth commented

2017-04-17 17:24:56 +02:00

Works perfectly, thanks Brecht!

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SSAO doesn't scale gracefully #51216