<div dir="ltr"><div class="markdown-here-wrapper" style="font-family:"Lucida Sans",Cantarell,Verdana,sans-serif;color:rgb(11,83,148)"><p style="margin:0px 0px 1.2em!important">Hi Elvis,</p>
<p style="margin:0px 0px 1.2em!important">Could you try downloading the <a href="http://www.paraview.org/download/">ParaView nightly binary</a> and test volume rendering there? You can use the wavelet source for a test dataset. ParaView uses the QVTKOpenGLWidget and it would be a good test before diving into the code.</p>
<p style="margin:0px 0px 1.2em!important">Thanks,<br>Sankhesh</p>
<div title="MDH:SGkgRWx2aXMsPGRpdj48YnI+PC9kaXY+PGRpdj5Db3VsZCB5b3UgdHJ5IGRvd25sb2FkaW5nIHRo
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ZW5HTFdpZGdldCBhbmQgaXQgd291bGQgYmUgYSBnb29kIHRlc3QgYmVmb3JlIGRpdmluZyBpbnRv
IHRoZSBjb2RlLjwvZGl2PjxkaXY+PGJyPjwvZGl2PjxkaXY+VGhhbmtzLDwvZGl2PjxkaXY+U2Fu
a2hlc2g8L2Rpdj48ZGl2Pjxicj48L2Rpdj4=" style="height:0;width:0;max-height:0;max-width:0;overflow:hidden;font-size:0em;padding:0;margin:0"></div></div></div><br><div class="gmail_quote"><div dir="ltr">On Tue, May 23, 2017 at 6:50 AM Elvis Stansvik <<a href="mailto:elvis.stansvik@orexplore.com">elvis.stansvik@orexplore.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi all,<br>
<br>
In porting to QVTKOpenGLWidget, I can't get volumes rendered using<br>
vtkGPUVolumeRayCastMapper to show up on Windows 7, Intel graphics (HD<br>
4600). They show up fine on Linux. They also show up fine on Windows 7<br>
if using a plain VTK render window. I've tried turning off<br>
multisampling with setSamples(0) on the default QSurfaceFormat.<br>
<br>
The below test case illustrates the issue. See the attached<br>
screenshots from running "TestCase" (left) and "TestCase 1" (right).<br>
The former uses a plain render window while the latter uses the new<br>
QVTKOpenGLWidget. Notice how in the Windows 7 screenshot, the plain<br>
VTK rendering works fine, but the QVTKOpenGLWidget one is not showing<br>
the volume.<br>
<br>
Versions used:<br>
<br>
Kubuntu Linux 16.04<br>
VTK 8.0.0.rc1, OpenGL2<br>
Qt 5.5.1<br>
<br>
Windows 7<br>
VTK 8.0.0.rc1, OpenGL2<br>
Qt 5.6.2<br>
<br>
Any ideas what the problem might be?<br>
<br>
I can provide a standalone .zip distribution of my build of the test<br>
case if you want.<br>
<br>
Note that this issue is orthogonal to the alpha issue I reported and<br>
got solved in my other thread.<br>
<br>
Many thanks in advance,<br>
Elvis<br>
<br>
<br>
main.cpp:<br>
<br>
#include <algorithm><br>
<br>
#include <vtkColorTransferFunction.h><br>
#include <vtkGenericOpenGLRenderWindow.h><br>
#include <vtkGPUVolumeRayCastMapper.h><br>
#include <vtkImageData.h><br>
#include <vtkNew.h><br>
#include <vtkPiecewiseFunction.h><br>
#include <vtkProperty.h><br>
#include <vtkRenderer.h><br>
#include <vtkRenderWindow.h><br>
#include <vtkRenderWindowInteractor.h><br>
#include <vtkVolume.h><br>
#include <vtkVolumeProperty.h><br>
<br>
#include <QVTKOpenGLWidget.h><br>
<br>
#include <QApplication><br>
<br>
int main(int argc, char *argv[])<br>
{<br>
auto defaultFormat = QVTKOpenGLWidget::defaultFormat();<br>
defaultFormat.setSamples(0);<br>
QSurfaceFormat::setDefaultFormat(defaultFormat);<br>
<br>
QApplication app(argc, argv);<br>
<br>
// Set up volume rendering<br>
vtkNew<vtkColorTransferFunction> colorFunction;<br>
colorFunction->AddRGBPoint(0.0, 0.0, 0.0, 0.0);<br>
colorFunction->AddRGBPoint(1.0, 0.0, 0.0, 0.0);<br>
<br>
vtkNew<vtkPiecewiseFunction> opacityFunction;<br>
opacityFunction->AddPoint(0.0, 0.0);<br>
opacityFunction->AddPoint(1.0, 1.0);<br>
<br>
vtkNew<vtkImageData> imageData;<br>
imageData->SetExtent(0, 200, 0, 200, 0, 200);<br>
imageData->AllocateScalars(VTK_FLOAT, 1);<br>
std::fill_n(static_cast<float *>(imageData->GetScalarPointer()),<br>
8000000, 0.01);<br>
<br>
vtkNew<vtkGPUVolumeRayCastMapper> volumeMapper;<br>
volumeMapper->SetInputData(imageData.Get());<br>
<br>
vtkNew<vtkVolumeProperty> volumeProperty;<br>
volumeProperty->SetScalarOpacity(opacityFunction.Get());<br>
volumeProperty->SetColor(colorFunction.Get());<br>
volumeProperty->ShadeOff();<br>
<br>
vtkNew<vtkVolume> volume;<br>
volume->SetMapper(volumeMapper.Get());<br>
volume->SetProperty(volumeProperty.Get());<br>
<br>
vtkNew<vtkRenderer> renderer;<br>
renderer->AddVolume(volume.Get());<br>
renderer->SetBackground(1.0, 1.0, 1.0);<br>
<br>
if (argc > 1) {<br>
// Render with QVTKOpenGLWidget<br>
vtkNew<vtkGenericOpenGLRenderWindow> window;<br>
window->AddRenderer(renderer.Get());<br>
<br>
auto widget = new QVTKOpenGLWidget();<br>
widget->SetRenderWindow(window.Get());<br>
widget->show();<br>
<br>
return app.exec();<br>
} else {<br>
// Render with "plain" render window / interactor<br>
vtkNew<vtkRenderWindow> window;<br>
window->AddRenderer(renderer.Get());<br>
<br>
vtkNew<vtkRenderWindowInteractor> interactor;<br>
interactor->SetRenderWindow(window.Get());<br>
interactor->Start();<br>
<br>
return 0;<br>
}<br>
}<br>
<br>
<br>
CMakeLists.txt:<br>
<br>
cmake_minimum_required(VERSION 3.1)<br>
<br>
project(TestCase)<br>
<br>
find_package(VTK 8.0 COMPONENTS<br>
vtkCommonCore<br>
vtkCommonDataModel<br>
vtkCommonExecutionModel<br>
vtkCommonMath<br>
vtkFiltersSources<br>
vtkGUISupportQt<br>
vtkInteractionStyle<br>
vtkRenderingCore<br>
vtkRenderingOpenGL2<br>
vtkRenderingVolume<br>
vtkRenderingVolumeOpenGL2<br>
REQUIRED<br>
)<br>
<br>
find_package(Qt5Widgets REQUIRED)<br>
<br>
add_executable(TestCase main.cpp)<br>
<br>
target_link_libraries(TestCase PUBLIC<br>
vtkCommonCore<br>
vtkCommonDataModel<br>
vtkCommonExecutionModel<br>
vtkCommonMath<br>
vtkFiltersSources<br>
vtkGUISupportQt<br>
vtkInteractionStyle<br>
vtkRenderingCore<br>
vtkRenderingOpenGL2<br>
vtkRenderingVolume<br>
vtkRenderingVolumeOpenGL2<br>
Qt5::Widgets<br>
)<br>
<br>
target_include_directories(TestCase PUBLIC<br>
${VTK_INCLUDE_DIRS}<br>
)<br>
<br>
target_compile_definitions(TestCase PUBLIC<br>
${VTK_DEFINITIONS}<br>
)<br>
<br>
set_target_properties(TestCase PROPERTIES<br>
CXX_STANDARD 14<br>
CXX_STANDARD_REQUIRED ON<br>
)<br>
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</blockquote></div><div dir="ltr">-- <br></div><div data-smartmail="gmail_signature"><div dir="ltr"><div class="inbox-markdown-here-wrapper" style="font-family:'proza libre',sans-serif;color:rgb(0,56,107)"><h5 id="inbox-sankhesh-jhaveri" style="margin:1.3em 0px 1em;padding:0px;font-size:1.1em;border-bottom-width:1px;border-bottom-style:solid;border-bottom-color:rgb(238,238,238);font-weight:bold;color:rgb(11,65,148)">Sankhesh Jhaveri</h5>
<h6 id="inbox--sr-research-development-engineer-kitware-http-www-kitware-com-518-881-4417" style="margin:1.3em 0px 1em;padding:0px;font-size:1em;color:rgb(11,83,148);font-family:'open sans',sans-serif;font-weight:normal"><em>Sr. Research & Development Engineer</em> | <a href="http://www.kitware.com/">Kitware</a> | (518) 881-4417</h6>
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