[vtkusers] Error setting 'vertexMC' in shader VAO and EGL_BAD_DISPLAY

[Ken Martin]

An error on setting an OpenGL attribute in VTK can be due to the attribute
not being used by the shader program or I believe trying to set the
attribute with no data. Maybe other reasons as well. Seeing the shader code
at the time the error occurs is the first step. You can uncomment
vtkOpenGL2PolyDataMapper.cxx in ReplaceShaderValues to print out the
shaders.

On Wed, Nov 18, 2015 at 6:01 AM, Lonni Besançon <lonni.besancon at gmail.com>
wrote:

> Hello,
>
> I am trying to write my own InteractorStyle for android. So far I was
> successful in changing what I wanted to change and creating it. Now I
> wanted
> to add a function that could handle a given rotation/translation given as a
> parameter. Here goes the function:
>
>
> /void myfunction(double* rotation, double* translation){
>     vtkProp3D* prop3D = actor ; // Actor is a variable of the class
>     vtkTransform* t = vtkTransform::New();
>     t->Identity();
>     t->RotateX(rotation[0]);
>     t->RotateY(rotation[1]);
>     t->RotateZ(rotation[2]);
>
>     prop3D->SetUserMatrix(t->GetMatrix());
>
>     vtkRenderWindowInteractor *rwi = this->Interactor;
>     rwi->Render();
> }/
>
> My previous code was working just fine, but now when I call this function I
> get the following errors:
> /
> E/VTK     ( 6271): ERROR: In
> /Users/....../Rendering/OpenGL2/vtkOpenGLPolyDataMapper.cxx, line 1413
> E/VTK     ( 6271): vtkOpenGLPolyDataMapper (0x4b8e6e90): Error setting
> 'vertexMC' in shader VAO.
> E/VTK     ( 6271): ERROR: In
> /Users/....../Rendering/OpenGL2/vtkOpenGLPolyDataMapper.cxx, line 1421
> E/VTK     ( 6271): vtkOpenGLPolyDataMapper (0x4b8e6e90): Error setting
> 'normalMC' in shader VAO.
> E/VTK     ( 6271): ERROR: In
> /Users/....../Rendering/OpenGL2/vtkOpenGLPolyDataMapper.cxx, line 1413
> E/VTK     ( 6271): vtkOpenGLPolyDataMapper (0x4b8e6e90): Error setting
> 'vertexMC' in shader VAO.
> E/VTK     ( 6271): ERROR: In
> /Users/....../Rendering/OpenGL2/vtkOpenGLPolyDataMapper.cxx, line 1421
> E/VTK     ( 6271): vtkOpenGLPolyDataMapper (0x4b8e6e90): Error setting
> 'normalMC' in shader VAO.
> E/libEGL  ( 6271): validate_display:254 error 3008 (EGL_BAD_DISPLAY)
> E/VTK     ( 6271): ERROR: In
> /Users/....../Rendering/OpenGL2/vtkOpenGLPolyDataMapper.cxx, line 1413
> E/VTK     ( 6271): vtkOpenGLPolyDataMapper (0x4b8e6e90): Error setting
> 'vertexMC' in shader VAO.
> E/VTK     ( 6271): ERROR: In
> /Users/....../Rendering/OpenGL2/vtkOpenGLPolyDataMapper.cxx, line 142
> /
>
> Note that the application does not crash and that my actor is rotated (by a
> fixed rotation even if I change the values) and that if I start a normal
> interaction with the actor again the application works just fine.
>
> I was therefore wondering what I am doing wrong here.
>
> I have created a post on StackOverflow for a more readable version of the
> code and the errors.
> StackOverflow Post
> <
> http://stackoverflow.com/questions/33778197/vtk-error-setting-vertexmc-in-shader-vao-and-egl-bad-display
> >
>
>
>
> --
> View this message in context:
> http://vtk.1045678.n5.nabble.com/Error-setting-vertexMC-in-shader-VAO-and-EGL-BAD-DISPLAY-tp5735057.html
> Sent from the VTK - Users mailing list archive at Nabble.com.
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-- 
Ken Martin PhD
Chairman & CFO
Kitware Inc.
28 Corporate Drive
Clifton Park NY 12065
518 371 3971

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