Thank you Robert.
Can you point me to more detailed documentation about the definition of these
two parameters, packing and rowLength?
Thanks,
Evan
robertosfield wrote:
> HI Evan,
>
> My best guess is that the packing of the data in each row is out, as
> your Image::setData(..) call doesn't supply all the parameters
> explicitly it will default to a packing of 1 byte.
>
> For instance if the packing for your source data is 4 bytes, and all
> you previous image data has a width with multiple of 4 then there
> won't be any mismatch when using a 1 byte packing as it will select
> the same width. However, if you use a width such as 3 then the source
> data with a 4 byte packing would round up to 4 bytes width, but the
> osg::Image::setImage() call you are using says just use 1 byte packing
> so selects a width of 3. This will result in a each successive row
> starting 1 byte off and leading to the "twist" you see.
>
> Check the spec of your image reading code/file format to see what the
> row packing is. Also have a look at the docs for
> osg::Image::setImage(..), note the optional packing and rowLength
> parameters.
>
> Robert
>
>
>
>
>
>
> On 18 February 2017 at 16:38, Evan Tsai <> wrote:
>
> > Thank you very much for helping. Below is how we make the call.
> >
> > This has been working fine until very recently we received scan data from
> > some CBCT scanners that we haven't encountered before. However those scans
> > could be viewed correctly in all popular DICOM viewers in the market. As
> > mentioned, I also took the pixel data and dumped it into a .bmp file, which
> > looks correct. So the only possibility seems to be that we are missing
> > some setting here......
> >
> > I did try changing the texture coordinates around but that doesn't change
> > the twisted nature of the display.
> >
> > I also tried changing `packing' from 1 to 0 but that crashes the software.
> >
> > Is there anything in particular that one needs to set for `rowLength'?
> >
> >
> >
> > osg::Geode* pGeode = new osg::Geode;
> >
> > osg::Vec3 v1(pBottomLeft[0], pBottomLeft[1], pBottomLeft[2]);
> > osg::Vec3 v2(pBottomRight[0], pBottomRight[1], pBottomRight[2]);
> > osg::Vec3 v3(pTopRight[0], pTopRight[1], pTopRight[2]);
> > osg::Vec3 v4(pTopLeft[0], pTopLeft[1], pTopLeft[2]);
> >
> > osg::Geometry* geom = new osg::Geometry;
> > geom->setDataVariance(osg::Object::DYNAMIC);
> > osg::Vec3Array* vertices = new osg::Vec3Array(4);
> > (*vertices)[0] = v1;
> > (*vertices)[1] = v2;
> > (*vertices)[2] = v3;
> > (*vertices)[3] = v4;
> > geom->setVertexArray(vertices);
> >
> > osg::Vec2Array* texcoords = new osg::Vec2Array(4);
> > (*texcoords)[0].set(0.0f, 0.0f);
> > (*texcoords)[1].set(1, 0.0f);
> > (*texcoords)[2].set(1, 1);
> > (*texcoords)[3].set(0.0f, 1);
> >
> > geom->setTexCoordArray(0, texcoords);
> >
> > osg::ref_ptr<osg::Vec3Array> normals = new osg::Vec3Array(1);
> > (*normals)[0].set(0.0f, -1.0f, 0.0f);
> > geom->setNormalArray(normals, osg::Array::BIND_OVERALL);
> > osg::Vec4Array* colors = new osg::Vec4Array(1);
> > (*colors)[0].set(1.0f, 1.0f, 1.0f, 1.0f);
> > geom->setColorArray(colors, osg::Array::BIND_OVERALL);
> >
> > geom->addPrimitiveSet(new osg::DrawArrays(GL_QUADS, 0, 4));
> > geom->setUseDisplayList(false);
> > osg::ref_ptr<osg::Image> img = new osg::Image;
> >
> > img->setImage(image.GetWidth(), image.GetHeight(), 1,
> > GL_DEPTH_COMPONENT, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE,
> > image.GetPixelData(),
> > osg::Image::USE_NEW_DELETE);
> >
> > //osg::ref_ptr<osg::Image> img =
> > osgDB::readRefImageFile("C:\\Users\\rupeshb\\Pictures\\error.bmp");
> >
> > //osg::ref_ptr<osg::Image> img = osgDB::readRefImageFile(filename);
> >
> > osg::ref_ptr<osg::Texture2D> texture = new osg::Texture2D(img);
> > texture->setFilter(osg::Texture::MIN_FILTER, osg::Texture::LINEAR);
> > texture->setFilter(osg::Texture::MAG_FILTER, osg::Texture::LINEAR);
> > osg::ref_ptr<osg::TexMat> texmat = new osg::TexMat;
> > texmat->setScaleByTextureRectangleSize(true);
> > // setup state
> > osg::ref_ptr<osg::StateSet> state = geom->getOrCreateStateSet();
> > state->setTextureAttributeAndModes(0, texture, osg::StateAttribute::ON |
> > osg::StateAttribute::PROTECTED);
> > state->setTextureAttributeAndModes(0, texmat, osg::StateAttribute::ON |
> > osg::StateAttribute::PROTECTED);
> >
> > state->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
> >
> > pGeode->addDrawable(geom);
> > addChild(pGeode);
> >
> > ------------------
> > Read this topic online here:
> > http://forum.openscenegraph.org/viewtopic.php?p=70254#70254
> >
> >
> >
> >
> >
> > _______________________________________________
> > osg-users mailing list
> >
> > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
> >
> _______________________________________________
> osg-users mailing list
>
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>
> ------------------
> Post generated by Mail2Forum
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=70274#70274
_______________________________________________
osg-users mailing list
[email protected]
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
