Re: [mitk-users] Overlay in 3D problem
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Re: [mitk-users] Overlay in 3D problem
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From: Kolb, C. <c....@dk...> - 2015-09-09 08:11:17
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I think the best thing for you would be to implement your own overlay: Derive from mitk::VtkOverlay3D and have a look at the TextOverlay3D as reference. As long as your used vtkProps are derived from vtkActor2D, they are always in foreground! http://www.vtk.org/doc/nightly/html/classvtkActor2D.htm<http://www.vtk.org/doc/nightly/html/classvtkActor2D.html> There is also the vtkPolyDataMapper2D http://www.vtk.org/doc/nightly/html/classvtkPolyDataMapper2D.html to render a (2D or 3D) Geometry as an overlay. Mind that the vtkFollower is not a 2D Actor, but you won't need it as you are drawing in display coordinates. Regards Christoph On Tue, 2015-09-08 at 19:39 +0200, Federico Milano wrote: The problem is that the VtkMapper constructor is also in the rendering loop, so if I add my foreground renderer there I invalidate the vtkRendererCollection iterator. I'm not displaying just text, I'm also displaying some planar geometry that follow the camera and is positioned in 3D coordinates. I could use TextOverlay2D for the text part (will it be always in the foreground? even in 2014.03?), but for the rest of the geometry what could you recommend me? Thanks in advance! Fede On Tue, Sep 8, 2015 at 4:57 AM, Kolb, Christoph <c....@dk...<mailto:c....@dk...>> wrote: Hi Federico, maybe you could create the foreground renderer in the constructor of your mapper. Use the mitk::RenderingManager to access all existing baserenderers and store the new forground renderer as a member of the mapper. This way it is created only once and outside of the rendering process. But I don't think that this will result in nice code... If your goal is to have a text overlay at a 3D word position, which is in foreground and always facing the camera I would recommend to use the mitk::TextOverlay2D. The problem is, that it requires the position on the display (in pixels) to be placed, but you can transform a 3D point to display coordinates by using the following methods: vtkRenderer::SetWorldPoint vtkRenderer::WorldToDisplay vtkRenderer::GetDisplayPoint Btw, we have recently added a method to the mitk::BaseRenderer that does exactly this transformation: http://docs.mitk.org/nightly/classmitk_1_1BaseRenderer.html#a5e168576694876aa7a89b5fb252bc8ce Regards Christoph On Tue, 2015-09-08 at 01:35 +0200, Federico Milano wrote: Hi Christoph, I just need to have a foreground renderer to add some actors, but I cannot apply the fix you mentioned in your previous answer (I just can use the 2014.03 version with no mods), so I was wondering where could I add the foreground renderer inside the mapper. Right now Im adding a foreground render in a view and then getting the highest layer renderer in the mapper...but if I leave it like that it is a recipe for future disaster. I would really appreciate if you could give me a hint. Thanks, Fede El sep 7, 2015 7:08 p.m., "Kolb, Christoph" <c....@dk...<mailto:c....@dk...><mailto:c....@dk...<mailto:c....@dk...>>> escribió: Hi Federico, I am not sure how you solved your previous problem, and wonder why the AddBaseRenderer Method is needed. This one is actually meant to register a new seperate renderer for the OverlayManager to manage. I would not recommend to use it for the registration of foreground renderers. Can you please explain how you want to use the foreground renderers? Regards Christoph ________________________________________ Von: Federico Milano [fm...@gm...<mailto:fm...@gm...><mailto:fm...@gm...<mailto:fm...@gm...>>] Gesendet: Montag, 7. September 2015 22:04 An: Kolb, Christoph Cc: mit...@li...<mailto:mit...@li...><mailto:mit...@li...<mailto:mit...@li...>> Betreff: Re: [mitk-users] Overlay in 3D problem Thank you Christoph. Another question, if I'm doing this in a VtkMapper, where should I add the renderer? Because if I do it in GenerateDataForRenderer() using something like mitk::OverlayManager::AddBaseRenderer() then I end up changing the vtkRendererCollection of the vtkRenderWindow while it is being traversed (GenerateDataForRenderer() is indirectly called by the Render() method of vtkRendererCollection). That invalidates the iterator and produces undefined behaviour (in my case, an Access Violation in the third overlay I add). It is clear to me how to add foreground renderers from other contexts, but I don't know how to add them in VtkMapper derived classes. Thanks in advance, Federico On Sun, Aug 30, 2015 at 1:47 PM, Kolb, Christoph <c....@dk...<mailto:c....@dk...><mailto:c....@dk...<mailto:c....@dk...>><mailto:c....@dk...<mailto:c....@dk...><mailto:c....@dk...<mailto:c....@dk...>>>> wrote: Hi Federico, prior to the 2015.05 Release, we have added a flag to the Overlays, that forces them to be drawn in front: <http://bugs.mitk.org/show_bug.cgi?id=18536>http://bugs.mitk.org/show_bug.cgi?id=18536 http://docs.mitk.org/nightly-qt4/classmitk_1_1OverlayManager.html#a78c770eb3f088025c9b8026d3c51fa7e Alternatively you could use the TextOverlay2D which is always on top. The difference is that this ones position is defined on the display. Regards Christoph On Sun, 2015-08-30 at 02:14 +0200, Federico Milano wrote: Hi. I'm trying to display an overlay in a 3D window. I'm using this document<http://mitk.org/images/d/d1/BugSquashingSeminars$Overlays_in_MITK.pdf>: as a guide. I've created a plugin that adds a TextOverlay3D to the 3D window renderer overlay manager (exaclty as it is stated in that document). The problem is that the TextOverlay3D is not being drawn over the scene. If you position, for example, a cube in front of it, it occludes the text (see attached screenshot). I'm using MITK 2014.03. I'll really appreciate any hint. Thanks, Federico ------------------------------------------------------------------------------ _______________________________________________ mitk-users mailing list mit...@li...<mailto:mit...@li...><mailto:mit...@li...<mailto:mit...@li...>><mailto:mit...@li...<mailto:mit...@li...><mailto:mit...@li...<mailto:mit...@li...>>> https://lists.sourceforge.net/lists/listinfo/mitk-users |
