ok, now I understand :) thanks for your answer
bnua 2007/9/21, Art Tevs <[EMAIL PROTECTED]>: > > Hi, Benoit. > > Yes there is a kind of clamp. 16 Bit float values can > only represent values upto 65504. Thus it is a good > practice to add something like: > > color = min(color, 65504); > > At the end of your shaders. > > See nVidia's FP_Specials.pdf for more info. > > > Cheers, Art > > > --- Benoit bossavit <[EMAIL PROTECTED]> schrieb: > > > Hi all, > > > > I'm trying to do a render in HDR with a CameraNode > > (osg1.2). > > I have a texture where I set an Image wich contains > > float values : > > > > img->setImage( width, height, 1, > > GL_INTENSITY16F_ARB, GL_LUMINANCE, > > GL_FLOAT, data, osg::Image::USE_NEW_DELETE ); > > texture->setImage(img.get()); > > texture->setFilter( osg::Texture::MIN_FILTER, > > osg::Texture::LINEAR ); > > texture->setFilter( osg::Texture::MAG_FILTER, > > osg::Texture::LINEAR ); > > texture->setWrap( osg::Texture::WRAP_S, > > osg::Texture::CLAMP ); > > texture->setWrap( osg::Texture::WRAP_T, > > osg::Texture::CLAMP ); > > > > > > In data I put values between 0.0 and 70000.0 > > I give this texture to my shaders and I project it > > with glsl function > > texture2DProj(). > > I have an artefact with the render (after tone > > mapping). Values upper than > > 65510 (not 65536) seems wrong. > > It's possible there is a max for float value with > > texture 16 bits ? and > > these max is "the same" that integer value? the rest > > of values or good, I > > can obtain for exemple a value like 25630.56. > > > > Someone can see something? > > > > thanks you. > > > > bnua > > > _______________________________________________ > > osg-users mailing list > > osg-users@lists.openscenegraph.org > > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > > > > ________ > Yahoo! Clever: Stellen Sie Fragen und finden Sie Antworten. Teilen Sie Ihr > Wissen. www.yahoo.de/clever > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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