[vtkusers] How to tune the line with of vtkProperty2D

Liu_tj tjlp at netease.com
Tue Aug 23 20:56:44 EDT 2016

Hi, Ken,

What do you mean "your hardware is saying it can draw wide lines up to 7.5 pixels"? From my attachment, the effect of 8.0f is greatly wider than 7.5f. I am using VTK 7 with OpenGL2.


在2016-08-24,"Ken Martin" <ken.martin at kitware.com> 写道: -----原始邮件-----
发件人:"Ken Martin" <ken.martin at kitware.com>
发送时间:2016年08月24日 星期三
收件人:"Liu_tj" <tjlp at netease.com>
抄送:"vtkusers" <vtkusers at vtk.org>
主题:Re: [vtkusers] How to tune the line with of vtkProperty2D

It sounds like an openGL driver issue.  What version of VTK are you using and is it built with the OPenGL1 or OpenGL2 backend? What GPU is on the system you are using? 

Assuming you are using a recent VTK with OpenGL2 backend my guess is that your hardware is saying it can draw wide lines up to 7.5 pixels (though it seems not to), beyond that VTK is having to render the wide lines itself. That would be my guess. If you are using a recent VTK with the OPenGL2 backend you can test this by modifying the HaveWideLines method in Rendering/OpenGL2/vtgkOpenGLPolyDataMapper2D.cxx


    return !(renWin &&
      renWin->GetMaximumHardwareLineWidth() >= actor->GetProperty()->GetLineWidth());


    return true;

On Mon, Aug 22, 2016 at 9:10 PM, Liu_tj <tjlp at netease.com> wrote:


I use vtkAngleWidget to measure angle. I want to tune the line width of the angle leaders and arc. Below is my C# code:

            m_angleWidget = vtkAngleWidget.New();
            m_angleWidget.PlacePointEvt += new vtkObject.vtkObjectEventHandler(AngleWidget_PlacePointEvt);
            m_angleRep = vtkAngleRepresentation2D.New();
            m_angleRep.GetRay1().GetProperty().SetColor(0.0, 1.0, 0.0);
            m_angleRep.GetRay2().GetProperty().SetColor(0.0, 1.0, 0.0);
            m_angleRep.GetArc().GetProperty().SetColor(0.0, 1.0, 0.0);
            m_angleRep.GetArc().GetLabelTextProperty().SetColor(0.0, 0.0, 1.0);

If I call SetLineWidth with 5.0f, 6.0f, 7.0f and 7.5f, I get the same effect as 1.jpg; if I call SetLineWidth with 8.0f, the effect is as 2.jpg. For me, the line in 1.jpg is too slim, the line in 2.jpg is too wide, how to tune it?

Liu Peng


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