Hi Robert,
There is no any error message popup. I tested on three machines which are
running windows xp. They also have the same problem. I guess the problem may
be related to opengl32.dll file which is at c:\windows\system32. The version
of this file is 5.1 in Windows XP and 6.1 in windows 7. I tried to run the
program with opengl32 5.1 version in Windows 7. It also comes out the same
problem (volume filled with white). If I replaced with the 6.1 version, the
problem is gone. But I cannot use the 6.1 opengl32 in windows xp since this
file is linking to mscvrt.dll file and it cannot be replaced. My test code is
very simple. Even the size of voxel is small, the problem is still existed.
int nx = 20;
int ny = 20;
int nz = 10;
unsigned char *pdisp_ptr;
pdisp_ptr = (unsigned char*)malloc(nx * ny *nz * 4 *(sizeof(unsigned
char)));
osg::ref_ptr<osgVolume::Volume> osgVolume = new osgVolume::Volume;
osg::ref_ptr<osgVolume::VolumeTile> tile = new osgVolume::VolumeTile;
osgVolume->addChild(tile.get());
osg::ref_ptr<osg::Image> osgImage = new osg::Image;
osg::ref_ptr<osgVolume::ImageLayer> layer = new
osgVolume::ImageLayer(osgImage.get());
tile->setLayer(layer.get());
tile->setVolumeTechnique(new osgVolume::RayTracedTechnique());
osgImage->setImage(nx, ny, nz, GL_RGBA8, GL_RGBA, GL_UNSIGNED_BYTE,
pdisp_ptr, osg::Image::NO_DELETE);
osg::ref_ptr<osg::RefMatrix> matrix = new osg::RefMatrix;
osg::ref_ptr<osgVolume::Locator> locator = new
osgVolume::Locator(*matrix.get());
layer->setLocator(locator.get());
tile->setLocator(locator.get());
locator->setTransformAsExtents(-nx/2.0, -ny/2.0, nx/2.0, ny/2.0,
-nz/2.0, nz/2.0);
osg::ref_ptr<osgVolume::CompositeProperty> cp = new
osgVolume::CompositeProperty;
layer->addProperty(cp.get());
osg::ref_ptr<osgVolume::AlphaFuncProperty> ap = new
osgVolume::AlphaFuncProperty(0.1f);
osg::ref_ptr<osgVolume::SampleDensityProperty> sdProperty = new
osgVolume::SampleDensityProperty(0.005);
osg::ref_ptr<osgVolume::TransparencyProperty> tp = new
osgVolume::TransparencyProperty(1.0f);
cp->addProperty(ap.get());
cp->addProperty(sdProperty.get());
cp->addProperty(tp.get());
osgViewer->setSceneData(osgVolume .get());
osgViewer->realize();
All machines in windows XP can run 3D program such as coin3D. If it is hardware
or driver problem, they should have the problem to run others 3D program. Let
me know if you need any information. Thanks.
Regards,
Clement
________________________________________
From: osg-users-boun...@lists.openscenegraph.org
[osg-users-boun...@lists.openscenegraph.org] On Behalf Of Robert Osfield
[robert.osfi...@gmail.com]
Sent: Thursday, 1 March 2012 7:59 PM
To: OpenSceneGraph Users
Subject: Re: [osg-users] osgVolume RayTracedTechnique problem
Hi Clement,
On 29 February 2012 14:26, <clement....@csiro.au> wrote:
> My program is set to use RayTracedTechnique for display voxel. I tested
> the same program on windows XP and windows 7 machines. Only windows 7
> machine can display the image properly. In windows XP, it shows the cube
> filled with white colour. I found out the problem is related to
> RayTracedTechnique. Any one got similar problem? How to fix this? Many
> thanks.
This is most likely to be an error in the OpenGL driver, unless your
hardware is dramatically different and can't handle the shaders.
As how to fix it... well you don't provide any information about any
OpenGL errors being reported, what hardware you are using, what size
of volume - you say voxel which is means one single data value which
can't be right...
Robert.
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