maunv

@VitaliBalyk do u want result =IsTopBottomViewOrientedToFrontBack="True" + revert it's direction.

@VitaliBalyk Like this one 

No, I just added a new feature property for HelixViewPort3D. If my answer (the photo above) is correct. I will create a new commit to this repo. Then you can...

Hello, my code was merged, you can get it through the Nightly build. if this issue is resolved.Please close this issue as complete issue. Thanks

Ok. I will

Hello. What's different between `PanGesture` and `PanGesture2` ; `RotateGesture ` and `RotateGesture` and `RotateGesture2` ; `MouseGesture` and `MouseGesture2` is `PanGesture` obsolete and it will be replaced by `PanGesture2` https://github.com/helix-toolkit/helix-toolkit/blob/6ced1354f965bf3e525cf2a538ad57261dba9b20/Source/HelixToolkit.Wpf/Controls/HelixViewport3D.cs#L2198-L2234 https://github.com/helix-toolkit/helix-toolkit/blob/6ced1354f965bf3e525cf2a538ad57261dba9b20/Source/HelixToolkit.Wpf/Controls/HelixViewport3D.cs#L2362-L2398...

Could you show more description or reproduce the error code

Can you share reproduce of the errors? I will see and fix it. Ah. Seem like u have a project same to me for a building

You can draw extent than outside of a cube face, maybe the line is just behide

> Thanks for your attention, the error message is not produced, the lines are simply not displayed, I think it is a drawing hierarchy problem; but I don't know how...