PopProjection is not reverting properly after Push2dProjection

Rhino Developer
1

Happy new year all,

I’m not able to make use of the new Push2dProjection method within a DisplayPipeline.DrawOverlay event. I was expecting to be used like:

      e.Display.Push2dProjection(); 
      // ... drawing in 2d
      e.Display.PopProjection();

but PopProjection does not recover the drawing as it should. Are we missing a Pop2dProjection method?

I have five classes subscribed to DisplayPipeline.DrawOverlay and one of they is using Push2dProjection. If I comment Push and Pop code lines, the last class is not displayed (as expected, geometry is in viewport coordinates) and what I have is:

image
image600×781 105 KB

but when I execute the code above (Push2dProjection/Draw/PopProjection) I can see the last class (the bottom rectangle) working as expected, but all the curves of the other classes are glitched at the center.
image
image597×768 99.6 KB

So it looks to me that PopProjection is not reverting properly, I tried calling all pop… methods as well but nothing.

I haven’t tried refactoring my classes to use DisplayConduit instead of subscribing to DisplayPipeline events, because it would require quite a bit of work but if there are enough reasons for it to be convenient I might try it.

Any help?
Thanks.

2

Try calling e.Display.Flush(); We cache up drawing operations and flush when state changes. We may not be properly doing this in these projection stack functions.

3

It works calling Flush() before Push2dProjection(), thank you Steve!
It should be registered as a bug, right? or is it ok to clear the cache every time it is drawn?