Bug report #21121
Hillshade Layer Style wrong if OpenCL acceleration is enabled
| Status: | Closed | ||
|---|---|---|---|
| Priority: | Normal | ||
| Assignee: |  Alessandro Pasotti | ||
| Category: | Rasters | ||
| Affected QGIS version: | 3.5(master) | Regression?: | No |
| Operating System: | Easy fix?: | No | |
| Pull Request or Patch supplied: | Yes | Resolution: | |
| Crashes QGIS or corrupts data: | No | Copied to github as #: | 28939 |
Description
Hello. I noticed that with certain DEM (not all), QGIS 3.4.4 generates a display problem in the "hillshade" style.
Only in the layer style, because the GDAL geo-process works perfectly.
Associated revisions
[opencl] Fix hillshade renderer with 16bit rasters
Fixes #21121
History
#1
Updated by luca bellani about 5 years ago
- File dem_prueba.tif added
#2
Updated by Alessandro Pasotti about 5 years ago
- Status changed from Open to Feedback
- Assignee set to Alessandro Pasotti
- Operating System changed from Windows 10 64 bit v. 1809 to Any
- Priority changed from High to Normal
- Affected QGIS version changed from 3.4.4 to 3.5(master)
I think it's a know issue and there is not much we can do, did you try to adjust the "Resampling" parameters in the renderer configuration?
#3
Updated by luca bellani about 5 years ago
Salve. What is strange to me, is that in QGIS 2.18 it does not give any problem.
And it seems to be something random. In QGIS 3.4.4, I loaded the DEM again, and adjust the "Resampling" parameters "bilineal", and now all is ok.
#4
Updated by Alessandro Pasotti about 5 years ago
I think it depends on the zoom level too.
#5
Updated by Giovanni Manghi about 5 years ago
Alessandro Pasotti wrote:
I think it's a know issue and there is not much we can do, did you try to adjust the "Resampling" parameters in the renderer configuration?
closing then?
#6
Updated by luca bellani about 5 years ago
- File comparacion.png added
- File DEM_prova2.rar added
I have reviewed other DEMs that gave me problems, and as can be seen in the comparative image, the problem is presented in QGIS 3, not in QGIS 2. I have already completely manipulated the resampling options, but it is not solved.
It's funny that it's a bug, but only in the new version of QGIS.
Annex also another DEM, so that they can prove it.
Thanks for the support.
#7
Updated by Alessandro Pasotti about 5 years ago
Out of curiosity: are you using OpenCL acceleration? If yes can you try to disable it?
#8
Updated by luca bellani about 5 years ago
Yes! That's the reason!
Deactivating OpenGl and always putting the resampling in "bilinear" is displayed correctly.
Thank you!
#9
Updated by Giovanni Manghi about 5 years ago
- Subject changed from Error Hillshade Layer Style to Hillshade Layer Style wrong if OpenCL acceleration is enabled
- Status changed from Feedback to Open
- Operating System deleted (
Any)
#10
Updated by Alessandro Pasotti about 5 years ago
Luca, can you please make a quick test with OpenCL activated and tell me if it works with the sampling bilinear option or if it does not?
If it does not work, can you please have a look to the QGIS messages (small icon at the bottom right) in the OpenCL section?
Also, please paste a picture of the OpenCL tab in your settings or copy-paste the information about your OpenCL device.
#11
Updated by luca bellani about 5 years ago
I did the tests. When you activate OpenCl, even if you change the type of resampling, it is displayed incorrectly.
In the message window, I do not see the OpenCl tab, I do not know if I have something wrong installed. Annex images.
Thank you
#12
Updated by Alessandro Pasotti about 5 years ago
- Status changed from Open to In Progress
- Category changed from Symbology to Rasters
- Pull Request or Patch supplied changed from No to Yes
PR https://github.com/qgis/QGIS/pull/9070
I'd like you to test if this patch solves your issue (with OpenCL ativated).
#13
Updated by Alessandro Pasotti about 5 years ago
- Status changed from In Progress to Closed
- % Done changed from 0 to 100
Applied in changeset qgis|1aef9cfa491c6de60f8c700c3705a57c735f9442.