Thank you so much Robert that was exactly what I needed!! I'm a little bit ashamed of my poor knowledge of OpenGL..... Regards
On Tue, Nov 18, 2008 at 4:29 PM, Robert Osfield <[EMAIL PROTECTED]>wrote: > Hi Simon, > > The normal way to manage this situation is to simple update the > geometry and tex coords as required. Now if you are wanting to > stricty use transforms to scale your geometry then you'll need to > something similar for your tex coords and luckily that is an OpenGL > feature for doing scaling - the texture matrix. To access this just > use the osg::TexMat state attribute, use a similar scale as you are > using for your transform. You can attach a StateSet with a TexMat to > the same Transform that you are using for scaling. The one caveat is > that it'll apply to whole subgraph you are decorate the TexMat with so > you might need to think about localising multiple TexMat for different > surfaces. > > Robert. > > On Tue, Nov 18, 2008 at 3:13 PM, Simon Loic <[EMAIL PROTECTED]> wrote: > > Hi all, > > I have a particular problem that I got no idea how to solve it. Here it > is: > > > > When I am scaling a drawable ( using a transform node ) the texture > attached > > to it is stretched. Obviously this behaviour is totally convenient for > many > > applications. Though, I am working on architecture and this behaviour is > > really troublesome. You can imagine for example that the Drawable > represent > > a rectangle piece of wall and the texture contains a brick pattern of > > dimension 1 meter over 1 meter. Then if I scale the Drawable to have 10m > x > > 15 m the Texture will stretched to fit this size. > > > > To my mind the only way to achieve what I want is to compute new texture > > coordinates from the ones of the Drawable and 2 scaling parameters (let's > > say sX and sY). > > Even if this is not theoretically difficult I don't have a sufficient > > knowledge of OSG to tell if it's already possible without embedding osg > with > > a new feature, or otherwise how to optimally extend osg to support this > kind > > of behaviour. > > > > If anyone understand what I'm trying to do, I will be so grateful for > your > > help > > regards. > > > > -- > > Loïc Simon > > > > _______________________________________________ > > osg-users mailing list > > [email protected] > > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > -- Loïc Simon
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