Bug report #10003
rendering artifacts while trying to use a custom CRS Ortho projection on Valmiera
| Status: | Closed | ||
|---|---|---|---|
| Priority: | Low | ||
| Assignee: | - | ||
| Category: | Projection Support | ||
| Affected QGIS version: | 2.2.0 | Regression?: | No |
| Operating System: | Ubuntu | Easy fix?: | No |
| Pull Request or Patch supplied: | No | Resolution: | |
| Crashes QGIS or corrupts data: | No | Copied to github as #: | 18493 |
Description
Spotted some rendering 'artifacts' while trying to use a custom CRS Ortho projection on Valmiera.
My custom CRS is an orthographic projection centered on London :-
+proj=ortho +lat_0=51.45 +lon_0=-1.0 +x_0=0 +y_0=0
As you can see from the enclosed screenshot, there are two types of rendering artifacts...
- 45 degree extensions to the top-left (filled vector layer)
- gradient filled ellipses radiating to (0,0) on the canvas (tisserot indicatrices vector layer)
I suspect that polygons which cross the visible 'horizon' aren't being clipped to the circle, and any vertices on these polygons which are hidden are being set to NaN / infinite / zero value?
Polygons, lines and points which are fully beyond the horizon remain hidden.
History
#1
Updated by Jürgen Fischer almost 10 years ago
- Target version changed from Version 2.2 to Future Release - Lower Priority
#2
Updated by Steven Kay over 8 years ago
- Status changed from Open to Closed
I've closed this, there's a plugin called "Clip to Hemisphere" which clips a vector layer to the hemispherical edge from a given center point... this fixes the rendering issues.