<div dir="ltr"><br><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div id="gmail-m_-1827701584355792326divtagdefaultwrapper" style="font-size:12pt;color:rgb(0,0,0);font-family:calibri,arial,helvetica,sans-serif" dir="ltr"><p>Since the OpenVR interface is a little bit hackish within VTK the only thing that decides whether it renders for OpenVR or for normal 2D-Display is whether we link against vtkOpenVR and vtkRenderingOpenVR modules or not.</p>
<p></p></div></div></blockquote><div><br></div><div><br></div><div>Ohh, actually that is a CMake option. If you turn VTK_OPENVR_OBJECT_FACTORY off then the normal rendering is the default and you can explicitly create OpenVR objects when/where you want them. Just make sure you create these 4 objects as the default factory will not create the OpenVR versions</div><div><br></div><div>vtkOpenVRRenderWindow</div><div>vtkOpenVRRenderer</div><div>ren->SetActiveCamera(a vtkOpenVRCamera)</div><div>renWin->SetInteractor(a vtkOpenVRRenderWindowInteractor);</div><div><br></div><div>and when using OpenVR you need to start the OpenVR interactor otherwise it will not work. That is what I do for ParaView right now to support both on screen and VR in the same executable.</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div id="gmail-m_-1827701584355792326divtagdefaultwrapper" style="font-size:12pt;color:rgb(0,0,0);font-family:calibri,arial,helvetica,sans-serif" dir="ltr"><p>Everything code related is the same.</p>
<p><br>
</p>
<p>So to reply to your Question:</p>
<p><span style="font-family:calibri,arial,helvetica,sans-serif,"apple color emoji","segoe ui emoji",notocoloremoji,"segoe ui symbol","android emoji",emojisymbols;font-size:16px">> Could you try rendering a volume with an identity matrix set as
its transformation?</span><br>
</p>
<p><span style="font-family:calibri,arial,helvetica,sans-serif,"apple color emoji","segoe ui emoji",notocoloremoji,"segoe ui symbol","android emoji",emojisymbols;font-size:16px"><br>
</span></p>
<p><span style="font-family:calibri,arial,helvetica,sans-serif,"apple color emoji","segoe ui emoji",notocoloremoji,"segoe ui symbol","android emoji",emojisymbols;font-size:16px">I've build this simple program and it only places a volume dataset
within the world without any transformation. The volume is directly given to the <span style="font-family:calibri,arial,helvetica,sans-serif;font-size:16px">GPUVolumeRCMapper without any transformation.</span> In "2D"-Renderwindow everything is fine.
Also in anaglyph rendering I get a nice 3D View.</span></p>
<p>But when I link against OpenVR module the view dependend distortions appear within VR. I've tried some things. </p>
<p>All I can say is, that the errors appear if I look at any edge or corner of the surrounding (invisible) boundingbox around the rendered volume. If I look directly on one side of the boundingbox everything seems fine. </p>
<p><br>
</p>
<p>The only thing I can imagine from this perspective is, that the <span style="font-family:calibri,arial,helvetica,sans-serif;font-size:16px">GPUVolumeRCMapper gets wrong view directions for the eyes. But the vtkOpenVRCamera objects seems to do everything
right.</span></p>
<p><br>
</p>
<p>I don't know how to adjust the clipping box / bounding box you mentioned. Can you explain how I can do this, maybe this helps me to debug further?</p>
<p><br>
</p>
<p>Sincerely,</p>
<p>Sebastian</p>
<pre style="margin-top:0px;margin-bottom:0px"></pre>
<p></p>
<div style="color:rgb(0,0,0)">
<hr style="display:inline-block;width:98%">
<div id="gmail-m_-1827701584355792326divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>Von:</b> vtkusers <<a href="mailto:vtkusers-bounces@vtk.org" target="_blank">vtkusers-bounces@vtk.org</a>> im Auftrag von Alvaro Sanchez <<a href="mailto:alvaro.sanchez@kitware.com" target="_blank">alvaro.sanchez@kitware.com</a>><br>
<b>Gesendet:</b> Mittwoch, 7. Dezember 2016 18:14<br>
<b>An:</b> polybos<br>
<b>Cc:</b> VTK Users<br>
<b>Betreff:</b> Re: [vtkusers] Distortions in Volumerendering in VR-Mode (HTC Vive)</font>
<div> </div>
</div>
<div>
<div dir="ltr">Hi,
<div><br>
</div>
<div>I have never tested the GPUVolumeRCMapper with OpenVR but as far as I remember Ken mentioned some time ago that he encountered a clipping/bbox related issue when adjusting the volume's orientation and position. Could you try rendering a volume with an
identity matrix set as its transformation?, this might give you a hint of what the mapper is doing wrong.</div>
<div><br>
</div>
<div>Cheers,</div>
<div>Alvaro</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Wed, Dec 7, 2016 at 11:38 AM, polybos <span dir="ltr">
<<a href="mailto:franz@znarfsoft.de" target="_blank">franz@znarfsoft.de</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Sebastian Heerwald wrote<br>
<span>> If I look onto the volume rendering and move around it, there appear<br>
> "refraction" lines.<br>
<br>
</span>Unfortunately I cannot help with this issue but I would also be very pleased<br>
if someone could help here. Or did you, Sebastian, already achieve some more<br>
insights into this problem?<br>
I also get such distortions on the HTC Vive when using<br>
vtkVolumeRayCastMapper, while everything seems perfectly well in a mesh-only<br>
rendering.<br>
<br>
Does anyone have similar issues? Maybe with Occulus Rift? As far as I<br>
understand Sebastian just test with a HTC Vive. At least I can only test<br>
with a HTC Vive.<br>
<br>
<br>
<br>
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<div>Alvaro Sanchez</div>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature">Ken Martin PhD<div>Chairman & CFO<br>Kitware Inc.<br>28 Corporate Drive<br>Clifton Park NY 12065<br>518 371 3971<div><br></div><div><span style="font-size:10pt;font-family:tahoma,sans-serif">This communication,
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