Robert, Are you suggesting that I compute the world space normal in the application and pass it to the shader? I absolutely need world space coordinates. If so, how would I get the normal of the triangle before evaluating the shader?
---------------------------------------- Marlin Rowley Software Engineer, Staff [cid:image002.jpg@01D39374.DEC5A2E0] Missiles and Fire Control 972-603-1931 (office) 214-926-0622 (mobile) marlin.r.row...@lmco.com<mailto:marlin.r.row...@lmco.com> From: osg-users <osg-users-boun...@lists.openscenegraph.org> On Behalf Of Robert Osfield Sent: Wednesday, July 11, 2018 11:26 AM To: OpenSceneGraph Users <osg-users@lists.openscenegraph.org> Subject: EXTERNAL: Re: [osg-users] World space normal. Hi Marlin, It can be done, but I strongly recommend that you don't go transforming vertex or normal data into world coordinates in the shader. I know there are some published algorithms that do this but it's a really bad practice and you shouldn't follow it as precision issues on only proper dataset will cause mayhem - the do the cals in world coordinates only for datasets with a local origin, it's just a mess for any real-word datasets. Cheers, Robert. On Wed, 11 Jul 2018 at 14:17, Rowley, Marlin R <marlin.r.row...@lmco.com<mailto:marlin.r.row...@lmco.com>> wrote: I have a world space vertex computed as follows: WorldVertex = osg_ViewMatrixInverse * gl_ModelViewMatrix * aVertex; I would like to get the world space normal from this vertex. Is there an equivalent osg_* matrix that does the same thing? I tried this: NormalWorld = gl_NormalMatrix * gl_Normal; But I know that is only putting the normal in view space. ---------------------------------------- Marlin Rowley Software Engineer, Staff [cid:image002.jpg@01D39374.DEC5A2E0] Missiles and Fire Control 972-603-1931 (office) 214-926-0622 (mobile) marlin.r.row...@lmco.com<mailto:marlin.r.row...@lmco.com> _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org<mailto:osg-users@lists.openscenegraph.org> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
_______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
