[vtkusers] How to use and set axes in a 3D scene

[German Larrain M.]

Dženan, thank you very much for your answer.

2011/11/11 Dženan Zukić <dzenanz at gmail.com>

> Well, if you do not mess with objects' transformation matrix for display
> purposes, it could probably be sufficient to just put your camera into a
> different position while using axes approach 2. The easy methods to adjust
> your camera position are: Pitch(), Azimuth() and Roll().
>
> If you mess with object transforms, then apply the same transform to the
> axes.
>
> On Thu, Nov 10, 2011 at 21:15, German Larrain M. <germanlarrainm at gmail.com
> > wrote:
>
>> Hi folks. I posted this question in stackoverflow<http://stackoverflow.com/questions/7810632/how-to-use-and-set-axes-in-a-3d-scene> more
>> than 3 weeks ago, unsuccessfully.
>> ----------
>> I'm creating a simulator coded in python and based on ODE (Open Dynamics
>> Engine). For visualization I chose VTK.
>>
>> For every object in the simulation, I create a corresponding source (e.g.
>> vtkCubeSource), mapper and actor. I am able to show objects correctly and
>> update them as the simulation runs.
>>
>> I want to add axes to have a point of reference and to show the direction
>> of each axis. Doing that I realized that, by default, X and Z are in the
>> plane of the screen and Y points outwards. In my program I have a different
>> convention.
>>
>> I've been able to display axes in 2 ways:
>>
>> 1) Image 1 <http://imagepaste.nullnetwork.net/viewimage.php?id=2610>
>>
>>     axes = vtk.vtkAxes()
>>     axesMapper = vtk.vtkPolyDataMapper()
>>     axesMapper.SetInputConnection(axes.GetOutputPort())
>>     axesActor = vtk.vtkActor()
>>     axesActor.SetMapper(axesMapper)
>>     axesActor.GetProperty().SetLineWidth(4)
>>
>> 2) Image 2 <http://imagepaste.nullnetwork.net/viewimage.php?id=2611>(colors do not match with the first case)
>>
>>     axesActor = vtk.vtkAxesActor()
>>     axesActor.AxisLabelsOn()
>>     axesActor.SetShaftTypeToCylinder()
>>     axesActor.SetCylinderRadius(0.05)
>>
>> In the second one, the user is allowed to set many parameters related to
>> how the axis are displayed. In the first one, I only managed to set the
>> line width but nothing else.
>>
>> So, my questions are:
>>
>>  - Which is the correct way to define and display axes in a 3D scene? I
>> just want them in a fixed position and orientation.
>>  - How can I set a different convention for the axes orientation, both
>> for their display and the general visualization?
>>
>> Thanks,
>> Germán
>>
>> --
>> Germán Larrain
>>
>> _______________________________________________
>> Powered by www.kitware.com
>>
>> Visit other Kitware open-source projects at
>> http://www.kitware.com/opensource/opensource.html
>>
>> Please keep messages on-topic and check the VTK FAQ at:
>> http://www.vtk.org/Wiki/VTK_FAQ
>>
>> Follow this link to subscribe/unsubscribe:
>> http://www.vtk.org/mailman/listinfo/vtkusers
>>
>>
>


-- 
Germán Larrain
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.vtk.org/pipermail/vtkusers/attachments/20111111/a8d94f20/attachment.htm>