Hi David, I unattached the fract math function and all strips gone away :) I haven't thought it was a simple bug :)
Thanks so much. Best regards. Umit Uzun 2008/10/17 David Spilling <[EMAIL PROTECTED]> > Umit, > > It's a well known gotcha with texture repeats. > > Each vertex has increasing causticsCoord.x. Imagine the vertices with coord > 0.0, 0.1, 0.2, 0.3 etc. The fragments in between any of these coords have > _interpolated_ texcoords i.e. a fragment halfway betwen 0.0 and 0.1 vertex > has a texcoord of 0.05. > > For the end vertices, you have 0.8,0.9,1.0, 1.1. The fract function turns > this into 0.8, 0.9, 0.0, 0.1 > > Hence a fragment half way between 0.9 and 1.0 interpolates the texcoord > between 0.9 and 0.0, giving 0.45, not 0.95 as you would want. Between 0.9 > and "1.0", then the actual texcoord used decreases rapidly from 0.9 to 0.0. > > The artifact you see is all of your caustics texture, mirrored, and shoved > into the last vertex gap. > > To get rid if it, try losing the "fract" instruction. There may also be > dependencies on your texture mode (REPEAT, MIRROR, CLAMP) that you might > need to play with depending on what your texture looks like. > > Hope that helps, > > David > > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > >
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