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List: vtk-developers
Subject: Re: [vtk-developers] Painters
From: Ken Martin <ken.martin () kitware ! com>
Date: 2015-09-17 13:36:25
Message-ID: c7a098fd3da427c4200b247e9752e989 () mail ! gmail ! com
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Hiya John,
It depends on what the painters/mappers do. I think there are three main
approaches you can use. The first would be to use the functions in
vtkOpenGLPolydataMapper to modify the existing shader code generated by VTK
to do something different (examples in
Rendering/OpenGL2/Testing/Cxx/TestUserShader and TestUserShader2). You
could do this by calling those functions in your application. The other
approach is to subclass off of the mapper and modify the shader code there.
vtkOpenGLPointGaussianMapper and vtkOpenGLSphereMapper are examples of this
approach that provide a generic superclass (without the OpenGL) it can be
quite a bit simpler if you are willing to just go with the OpenGL class.
If you need to pass different data arrays to the shader then subclassing
like that is the current way to go.
The third option is to create a render pass that does something special to
some or all of the props. This is more useful when your painters are being
used to do some sort of rendering technique like shadow maps, or cell
coloring, eye dome lighting etc. Examples of those include
Rendeing/OpenGL2/*Pass* classes.
Thanks
Ken
Ken Martin PhD
Chairman & CFO
Kitware Inc.
28 Corporate Drive
Clifton Park NY 12065
ken.martin@kitware.com
919 869-8871 (w)
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*From:* vtk-developers [mailto:vtk-developers-bounces@vtk.org] *On Behalf
Of *Biddiscombe, John A.
*Sent:* Thursday, September 17, 2015 3:12 AM
*To:* vtk-developers@vtk.org
*Subject:* [vtk-developers] Painters
Dear list,
Did I read somewhere that with the switch to OpenGL2, the support for
painters in VTK was being dropped?
If this is the case, should I rewrite all my custom renderers as plain old
mappers again - or is there some new approach that I should adopt. A link
to any kind of wiki entry would be appreciated if one exists.
thanks
JB
--
John Biddiscombe, email:biddisco @.at.@ cscs.ch
http://www.cscs.ch/
CSCS, Swiss National Supercomputing Centre | Tel: +41 (91) 610.82.07
Via Trevano 131, 6900 Lugano, Switzerland | Fax: +41 (91) 610.82.82
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--></style></head><body lang="EN-US" link="blue" vlink="purple"><div \
class="WordSection1"><p class="MsoNormal"><a name="_MailEndCompose"><span \
style="color:#1f497d">Hiya John,</span></a></p><p class="MsoNormal"><span \
style="color:#1f497d"> </span></p><p class="MsoNormal"><span \
style="color:#1f497d">It depends on what the painters/mappers do. I think there are \
three main approaches you can use. The first would be to use the functions in \
vtkOpenGLPolydataMapper to modify the existing shader code generated by VTK to do \
something different (examples in Rendering/OpenGL2/Testing/Cxx/TestUserShader and \
TestUserShader2). You could do this by calling those functions in your application. \
The other approach is to subclass off of the mapper and modify the shader code there. \
vtkOpenGLPointGaussianMapper and vtkOpenGLSphereMapper are examples of this approach \
that provide a generic superclass (without the OpenGL) it can be quite a bit simpler \
if you are willing to just go with the OpenGL class. If you need to pass different \
data arrays to the shader then subclassing like that is the current way to go. \
</span></p><p class="MsoNormal"><span style="color:#1f497d"> </span></p><p \
class="MsoNormal"><span style="color:#1f497d">The third option is to create a render \
pass that does something special to some or all of the props. This is more useful \
when your painters are being used to do some sort of rendering technique like shadow \
maps, or cell coloring, eye dome lighting etc. Examples of those include \
Rendeing/OpenGL2/*Pass* classes.</span></p><p class="MsoNormal"><span \
style="color:#1f497d"> </span></p><p class="MsoNormal"><span \
style="color:#1f497d">Thanks</span></p><p class="MsoNormal"><span \
style="color:#1f497d">Ken</span></p><p class="MsoNormal"><span style="color:#1f497d"> \
</span></p><p class="MsoNormal"><span style="color:#1f497d"> </span></p><p \
class="MsoNormal"><span style="color:#1f497d"> </span></p><div><p \
class="MsoNormal"><span style="color:#1f497d">Ken Martin PhD</span></p><p \
class="MsoNormal"><span style="color:#1f497d">Chairman & CFO</span></p><p \
class="MsoNormal"><span style="color:#1f497d">Kitware Inc.</span></p><p \
class="MsoNormal"><span style="color:#1f497d">28 Corporate Drive</span></p><p \
class="MsoNormal"><span style="color:#1f497d">Clifton Park NY 12065</span></p><p \
class="MsoNormal"><a \
href="mailto:ken.martin@kitware.com">ken.martin@kitware.com</a><span \
style="color:#1f497d"></span></p><p class="MsoNormal"><span style="color:#1f497d">919 \
869-8871 (w)</span></p><p class="MsoNormal"><span style="color:#1f497d"> \
</span></p><p class="MsoNormal"><span style="color:#1f497d"> </span></p><p \
class="MsoNormal"><span style="color:#1f497d">This communication, including all \
attachments, contains confidential and legally privileged information, and it is \
intended only for the use of the addressee. Access to this email by anyone else is \
unauthorized. If you are not the intended recipient, any disclosure, copying, \
distribution or any action taken in reliance on it is prohibited and may be unlawful. \
If you received this communication in error please notify us immediately and destroy \
the original message. Thank you.</span></p></div><p class="MsoNormal"><span \
style="color:#1f497d"> </span></p><div><div style="border:none;border-top:solid \
#b5c4df 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b><span \
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span \
style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> \
vtk-developers [mailto:<a \
href="mailto:vtk-developers-bounces@vtk.org">vtk-developers-bounces@vtk.org</a>] \
<b>On Behalf Of </b>Biddiscombe, John A.<br><b>Sent:</b> Thursday, September 17, 2015 \
3:12 AM<br><b>To:</b> <a \
href="mailto:vtk-developers@vtk.org">vtk-developers@vtk.org</a><br><b>Subject:</b> \
[vtk-developers] Painters</span></p></div></div><p class="MsoNormal"> </p><p \
class="MsoNormal"><span lang="EN-GB">Dear list,</span></p><p class="MsoNormal"><span \
lang="EN-GB"> </span></p><p class="MsoNormal"><span lang="EN-GB">Did I read \
somewhere that with the switch to OpenGL2, the support for painters in VTK was being \
dropped?</span></p><p class="MsoNormal"><span lang="EN-GB"> </span></p><p \
class="MsoNormal"><span lang="EN-GB">If this is the case, should I rewrite all my \
custom renderers as plain old mappers again - or is there some new approach that I \
should adopt. A link to any kind of wiki entry would be appreciated if one \
exists.</span></p><p class="MsoNormal"><span lang="EN-GB"> </span></p><p \
class="MsoNormal"><span lang="EN-GB">thanks</span></p><p class="MsoNormal"><span \
lang="EN-GB"> </span></p><p class="MsoNormal"><span lang="EN-GB">JB</span></p><p \
class="MsoNormal"><span lang="EN-GB"> </span></p><p class="MsoNormal"><span \
style="font-size:10.0pt;font-family:"Courier New"">-- </span></p><p \
class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier \
New"">John Biddiscombe, \
email:biddisco @.at.@ <a href="http://cscs.ch">cscs.ch</a></span></p><p \
class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier \
New""><a href="http://www.cscs.ch/"><span \
style="color:windowtext">http://www.cscs.ch/</span></a></span></p><p \
class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier \
New"">CSCS, Swiss National Supercomputing Centre | Tel: +41 (91) \
610.82.07</span></p><p class="MsoNormal"><span lang="IT-CH" \
style="font-size:10.0pt;font-family:"Courier New"">Via Trevano 131, 6900 \
Lugano, Switzerland | Fax: +41 (91) 610.82.82</span></p><p \
class="MsoNormal"><span lang="IT-CH"> </span></p></div></body></html>
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