How to get the GroundPlane class in realtime in RhinoCommon?

Rhino Developer
1

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There doesn’t seem to be a way to edit the Displaymodes’ GroundPlane altitude in RhinoCommon
https://developer.rhino3d.com/api/rhinocommon/rhino.render.groundplane

Any ideas?

2

Hi @Wiley,

I’ve logged the request.

https://mcneel.myjetbrains.com/youtrack/issue/RH-82276

– Dale

3

@dale, is this property accessible via the c++ SDK?

4

@mrhe - all display mode setting are available in C++.

For ground plane specifically, see CDisplayPipelineAttributes::m_customGroundPlaneSettings.

– Dale

5

Thanks @dale.

Could you please provide an example on how to use this?

I tried the following code but without success:

void SetGroundPlaneForViewport(ON_UUID viewportId, double elevation)
{
    CRhinoDoc* doc = RhinoApp().ActiveDoc();
    if (!doc)
        return;

    auto view = doc->ViewFromViewportId(viewportId);
    auto settings = view->DisplayAttributes();

    auto test = new CDisplayPipelineAttributes(*settings);
    test->SetName("test");
    test->m_customGroundPlaneSettings.on = true;
    test->m_customGroundPlaneSettings.automaticAltitude = false;
    test->m_customGroundPlaneSettings.altitude = elevation;
    view->ActiveViewport().SetDisplayMode(test->Id());
    
}

Edit: found this reference: Rhino - Modifying Advanced Display Settings

6

Here is the working version if anyone is interested:

void SetGroundPlaneForViewport(double elevation)
{
    CRhinoDoc* doc = RhinoApp().ActiveDoc();
    if (!doc)
        return;

    CRhinoView* activeView = RhinoApp().ActiveView();
    
    const UUID displayModeId = activeView->ActiveViewport().View().m_display_mode_id;
    DisplayAttrsMgrListDesc* displayMode = CRhinoDisplayAttrsMgr::FindDisplayAttrsDesc(displayModeId);
    CDisplayPipelineAttributes* attributes = displayMode->m_pAttrs;

    attributes->m_customGroundPlaneSettings.on = true;
    attributes->m_customGroundPlaneSettings.automaticAltitude = false;
    attributes->m_customGroundPlaneSettings.altitude = elevation;

    activeView->Redraw();
}
7

Hi @mrhe,

Please do something safer, like this:

static bool SetGroundPlaneForViewport(double elevation)
{
  bool rc = false;
  CRhinoView* pView = RhinoApp().ActiveView();
  if (nullptr != pView && ON_IsValid(elevation))
  {
    const UUID display_mode_id = pView->ActiveViewport().View().m_display_mode_id;
    DisplayAttrsMgrListDesc* pDisplayMode = CRhinoDisplayAttrsMgr::FindDisplayAttrsDesc(display_mode_id);
    if (nullptr != pDisplayMode)
    {
      CDisplayPipelineAttributes* pAttrs = pDisplayMode->m_pAttrs;
      if (nullptr != pAttrs)
      {
        pAttrs->m_customGroundPlaneSettings.on = true;
        pAttrs->m_customGroundPlaneSettings.automaticAltitude = false;
        pAttrs->m_customGroundPlaneSettings.altitude = elevation;
        rc = true;
      }
    }
    if (rc)
    {
      CRhinoDisplayAttrsMgr::SetIsModified(true);
      CRhinoDisplayAttrsMgr::SaveProfile(RhinoApp().ProfileContext());
      pView->Redraw();
    }
  }
  return rc;
}

Thanks,

– Dale