[vtkusers] Shadows with VTK 8.0

[Yeshwanth, Chandan]

Sorry, I was looking for the examples in the wrong directory (OpenGL). I tried out the example in the OpenGL2 directory and most of the API works in Python, except line 94 (https://github.com/Kitware/VTK/blob/master/Rendering/OpenGL2/Testing/Cxx/TestShadowMapBakerPass.cxx) –

·        vtkTextureObject *to = (*bakerPass->GetShadowMaps())[2];
The error in Python is “AttributeError: 'vtkRenderingOpenGL2Python.vtkShadowMapBakerPass' object has no attribute 'GetShadowMaps'”. I couldn’t find an alternative to this yet.

If comment out this code and run it, the second renderWindow.Render() call causes a segmentation fault with this error –

·        Warning: In /home/user1/VTK-8.0.1/Common/ExecutionModel/vtkAlgorithm.cxx, line 1422

·        vtkOpenGLTexture (0x5555ba473d10): Attempt to get connection index 0 for input port 0, which has 0 connections.

·        Segmentation fault (core dumped)

Please let me know if you have any advice for this. Meanwhile I will try out the other example - TestShadowMapPass.cxx.

Regards,
Chandan

From: Yeshwanth, Chandan (CT RDA BAM ADM-IN)
Sent: Friday, November 17, 2017 9:45 AM
To: 'Ken Martin'; Chiranjib Sur
Cc: vtkusers at vtk.org; Chennamsetty, Sai Saketh (CT RDA BAM ADM-IN)
Subject: RE: [vtkusers] Shadows with VTK 8.0

Thanks Ken, Chiranjib. I tried out the example you mentioned in Rendering/OpenGL2/Testing/Cxx.

It looks like the API has changed in a few places –

·       vtkShadowMapBakerPass.SetOpaquePass is now SetOpaqueSequence

I couldn’t resolve these API errors, which seem to be essential to rendering shadows -

·       vtkShadowMapBakerPass has no member named SetPolygonOffsetFactor

·       vtkShadowMapBakerPass has no member named SetPolygonOffsetUnits

·       ‘OCCLUDER’ is not a member of ‘vtkShadowMapBakerPass’

·       ‘RECEIVER’ is not a member of ‘vtkShadowMapBakerPass’

I searched for the new API in the “API Changes” sections that Chiranjib mentioned as well as in the VTK source code itself, but I couldn’t find the new function calls to be used.
Can you please help me out with this?

Regards,
Chandan

From: Ken Martin [mailto:ken.martin at kitware.com]
Sent: Thursday, November 16, 2017 7:24 PM
To: Chiranjib Sur
Cc: Yeshwanth, Chandan (CT RDA BAM ADM-IN); vtkusers at vtk.org<mailto:vtkusers at vtk.org>; Chennamsetty, Sai Saketh (CT RDA BAM ADM-IN)
Subject: Re: [vtkusers] Shadows with VTK 8.0

There is also a test of shadows in Rendering/OpenGL2/Testing/Cxx that you can look at - Ken

On Thu, Nov 16, 2017 at 4:40 AM, Chiranjib Sur <sur.chiranjib at gmail.com<mailto:sur.chiranjib at gmail.com>> wrote:
This wiki link gives you the details of the API changes in VTK development : https://www.vtk.org/Wiki/VTK/Roadmap

Hope that helps


Thanks and regards,
Chiranjib

On Thu, Nov 16, 2017 at 3:00 PM, Yeshwanth, Chandan <chandan.yeshwanth at siemens.com<mailto:chandan.yeshwanth at siemens.com>> wrote:
Hi,

Can anyone help me implement shadow mapping with VTK 8.0?
The existing example here - https://lorensen.github.io/VTKExamples/site/Cxx/Visualization/Shadows/ gives this error –
AttributeError: 'vtkRenderingOpenGL2Python.vtkShadowMapBakerPass' object has no attribute 'SetOpaquePass'

Has the API changed from 5.10 to 8? A minimum working example of shadows in VTK 8 or a summary of the API changes will be great!

Thanks,
Chandan

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