Bryan, I've used this:
// disable clamping osg::ClampColor* clamp = new osg::ClampColor(); clamp->setClampVertexColor(GL_FALSE); clamp->setClampFragmentColor(GL_FALSE); clamp->setClampReadColor(GL_FALSE); scene->getOrCreateStateSet()->setAttribute(clamp, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE); Brian This is a PRIVATE message. If you are not the intended recipient, please delete without copying and kindly advise us by e-mail of the mistake in delivery. NOTE: Regardless of content, this e-mail shall not operate to bind CSC to any order or other contract unless pursuant to explicit written agreement or government initiative expressly permitting the use of e-mail for such purpose. • [email protected] wrote: ----- To: "OpenSceneGraph Users" <[email protected]> From: "Thrall, Bryan" <[email protected]> Sent by: [email protected] Date: 03/04/2009 05:05PM Subject: [osg-users] Float textures seem to be clamped in GLSL I'm rather new to using float textures and GLSL, so maybe I'm missing something. I'm trying to use a float texture as a lookup table in my fragment shader. I create the texture using osg::TransferFunction1D (see attached modified osgviewer.cpp), and use the following in my input file: ---8<--- 50 0 0 0 0 0 50 ---8<--- For example: osgviewer --pos implicit.pos implicit_surface.osg (the shaders need to be in a shaders/ subdirectory under implicit_surface.osg's directory) My shader takes these positions and renders implicit spheres around them, with the first line of the position file being the radius. However, the positions seem to be clamped to [0,1], since the resulting spheres overlap except for a little bit at the edge (changing the radius to 1 shows their centers are 1 unit apart). My understanding is that float textures should be passed through to the shader without clamping. Is there something I'm doing wrong with osg::TransferFunction1D, or is my understanding wrong? Thanks, -- Bryan Thrall FlightSafety International [email protected] _______________________________________________ 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
