Bug report #10003
rendering artifacts while trying to use a custom CRS Ortho projection on Valmiera
|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|
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.