[vtkusers] Projected shadow rendering in a vtkRenderWindow

Remi Charrier remi.charrier at gmail.com
Tue Jun 28 10:28:11 EDT 2016

Thanks for the information,

As you probably guessed I was not looking in the proper folder for the
OpenGL2 backend that I configured.

I managed to get something, almost working (I have strange shadows in
addition to the normal shadow) by changing this example. As I would like to
understand what is wrong, I then started to try to get the
TestShadowMapPass.cxx  working as it is.

I have 2 problems:
 -  #include "vtkRegressionTestImage.h"
"Cannot open include file: 'vtkRegressionTestImage.h' "
I believe I did not include or generate the vtk module that contains it
(but I do not manage to know which one it could be). It seems it is not
useful for the core of this feature, but I would like to get everything
working before going further...

- the code is mentioning a 3D object: dragon.ply . On my computer I only
have the dragon.ply.md5 . What should I do? Use another software to
transform the .md5 into a .ply, or something else?

Finally, as you mentioned, this shadow rendering seems to not be compatible
with the stereo technique implemented in the vtkRenderWindow or at least no


2016-06-27 21:43 GMT+02:00 Ken Martin <ken.martin at kitware.com>:

> For both the old and new OpenGL backends there are tests built into VTK
> using shadows. See
> VTK/Rendering/OpenGL2/Testing/Cxx/TestShadowMapPass.cxx or if building the
> old backend
> VTK/Rendering/OpenGL/Testing/Cxx/TestShadowMapPass.cxx.  I have do not
> know if those will work in conjunction with the stereo technique you are
> using but those examples should give you some ideas.
> Thanks
> Ken
> On Mon, Jun 27, 2016 at 3:22 AM, Remi Charrier <remi.charrier at gmail.com>
> wrote:
>> Dear vtk users community,
>> I started 3 weeks ago a new project with vtk, I just register to this
>> mailing list to get answers to some of my questions. Let me know if I am
>> doing anything wrong in the use of this mailing list.
>> My development environment is :
>> - Visual Studio 2013
>> - vtk7.0
>> - qt5.7
>> My computer has a NVidia TITAN X graphic card.
>> Here is my problem:
>> - I managed to create a vtkRenderWindow that allows me to display
>> different 3D meshes
>> - I am using Stereo Rendering (Anaglyph mode)
>> - I would like to project the shadows of my different elements on the
>> others elements.
>> To do so I tried many different things, but did not manage to find
>> anything that seems to work.
>> Here are what I tried:
>> - vtkEDLshading - I got it running but it does not do what I expected and
>> no projected shadows appear
>> - vtkShadowMapBakerPass (as described in
>> http://www.vtk.org/Wiki/VTK/Examples/Cxx/Visualization/Shadows) but I
>> have compilation errors on vtkShadowMapBakerPass::OCCLUDER(), it seems
>> this class has change or I missed something: "error C2039: 'OCCLUDER' :
>> is not a member of 'vtkShadowMapBakerPass'"
>> - Then I tried to only use basic functions associated to the renderer or
>> the actors: m_Renderer->UseShadowsOn();     m_cylTipActor->GetProperty()->ShadingOn();
>> But once again no visible result...
>> If someone can tell me where the correct information to display projected
>> shadows with VTK 7.0 can be found, I can then investigate and come back to
>> you with my code if I am still having problems.
>> Thanks in advance,
>> Rémi (glad to come back to vtk after an 8 years break)
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