Hi,
I think that the only thing missing is a vbo->dirty()
Regards
El jue, 07-02-2008 a las 19:31 +0100, lucas Grijander escribió:
> Thanks Rubén,
>
> I'm trying to use VBO, but I think something is missing... I added
> this to the creation of my geometry:
>
> myGeom->setSupportsDisplayList(false);
> myGeom->setUseDisplayList(false);
> myVertexBuffer = myGeom->getOrCreateVertexBufferObject();
> myVertexBuffer->setArray(0,&v);
> myVertexBuffer->setUsage(GL_STREAM_DRAW_ARB);
> myGeom->setUseVertexBufferObjects(true);
>
> and then inside the callback I'm try to modify the vertex data:
>
> osg::Vec3Array *test = dynamic_cast<osg::Vec3Array
> *>(testNx->myVertexBuffer->getArray(0));
>
> for(int i = 0; i < numVertex; i++)
> {
> NxMat34 pose = listShapes.at(i)->shape->getGlobalPose();
> osg::Vec3f trans = osg::Vec3(pose.t.x,pose.t.y,pose.t.z);
>
> test->at(i) = trans;
> }
>
> but nothing changes in the render.... the object does not move. Does
> anybody know what is missing??
>
> thanks in advance
>
> Crisalix.
>
>
>
> ______________________________________________________________________
> > From: [EMAIL PROTECTED]
> > To: [email protected]
> > Date: Wed, 6 Feb 2008 21:33:51 +0100
> > Subject: Re: [osg-users] How to modify the array of vertex from a
> Geometry object
> >
> > Hi,
> >
> > Some hints:
> >
> > 1. Be sure that test->size() is equal to numVertex
> >
> > 2. I don't know what the "at" method is, I couldn't find it either
> on
> > the TemplateArray class or the std::vector class. Try with the
> vector []
> > operator, ie: (*test)[i] = trans
> >
> > 3. If you are updating the vertex data once per frame, don't use
> display
> > lists, it is the worst thing that you can ever do! It is cheaper
> even to
> > use direct mode. Use vertex buffer objects and configure the VBO
> > (getOrCreateVertexBufferObject) in streaming mode (GL_STREAM_DRAW).
> >
> > Hope this helps.
> >
> > Regards.
> >
> > Rubén
> >
> > El mié, 06-02-2008 a las 14:08 +0100, lucas Grijander escribió:
> > > Dear all,
> > >
> > > I have to create a 3D surface, and then such surface will be
> modified during the application with several deformations. I've tried
> to create a Geometry object, then I set the VertexArray, and finally
> inside the render callback I update such vertex with the new ones. I
> got some errors during the rendering:
> > >
> > > Warning: detected OpenGL error "value not valid" after
> RenderBin::draw(,)
> > >
> > > Does anyone has an idea of such error? In addition, I'm sure the
> way I am accessing the vertex is not the right one, anybody knows the
> best way?
> > >
> > > here is the code:
> > >
> > >
> > > //Create the 3D geometry
> > >
> -------------------------------------------------------------------------
> > > osg::Vec3Array(m*n));
> > > osg::Vec2Array& t = *(new osg::Vec2Array(m*n));
> > > osg::Vec4Array& col = *(new osg::Vec4Array(1));
> > >
> > > col[0][0] = col[0][1] = col[0][2] = col[0][3] = 1.0f;
> > >
> > > int index = 0;
> > > for( i = 0; i < m; i++ )
> > > {
> > > for(j = 0; j < n; j++)
> > > {
> > > v[index][0] = i;
> > > v[index][1] = 0;
> > > v[index][2] = j;
> > >
> > > t[index][0] = (float)i/(m-1);
> > > t[index][1] = (float)j/(n-1);
> > >
> > > index++;
> > > }
> > > }
> > >
> > > myGeom = new osg::Geometry;
> > >
> > > myGeom->setVertexArray( &v );
> > > myGeom->setTexCoordArray( 0, &t );
> > >
> > > myGeom->setColorArray( &col );
> > > myGeom->setColorBinding( osg::Geometry::BIND_OVERALL );
> > >
> > > for( i = 0; i < m-1; i++ )
> > > {
> > > osg::DrawElementsUShort* elements = new
> osg::DrawElementsUShort(osg::PrimitiveSet::TRIANGLE_STRIP);
> > > elements->reserve(m*2);
> > > for( j = 0; j < n; j++ )
> > > {
> > > elements->push_back((i+0)*n+j);
> > > elements->push_back((i+1)*n+j);
> > > }
> > > myGeom->addPrimitiveSet(elements);
> > > }
> > >
> > >
> > > osg::Texture2D *tex = new osg::Texture2D;
> > >
> > > tex->setImage(osgDB::readImageFile("Images/breast.png"));
> > >
> > > osg::StateSet *dstate = new osg::StateSet;
> > > dstate->setMode( GL_LIGHTING, osg::StateAttribute::OFF );
> > > dstate->setTextureAttributeAndModes(0, tex,
> osg::StateAttribute::ON );
> > > dstate->setTextureAttribute(0, new osg::TexEnv );
> > >
> > > myGeom->setStateSet( dstate );
> > >
> > > osg::Geode *geode = new osg::Geode;
> > > geode->addDrawable( myGeom );
> > >
> > > -------------------------------------------------------
> > >
> > > //Accessing the elements
> > > -------------------------------------------
> > >
> > > osg::Vec3Array *test = dynamic_cast(myGeom->getVertexArray());
> > >
> > > for(int i = 0; i < numVertex; i++)
> > > {
> > > NxMat34 pose = listShapes.at(i)->shape->getGlobalPose();
> > > osg::Vec3f trans = osg::Vec3(pose.t.x,pose.t.y,pose.t.z);
> > >
> > > test->at(i) = trans;
> > >
> > >
> > >
> > > }
> > > myGeom->dirtyDisplayList();
> > > myGeom->dirtyBound();
> > > --------------------------------------------
> > >
> > > thank you very much for your help!!!
> > >
> > > Crisalix.
> > >
> > >
> > > _________________________________________________________________
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