Hi Robert! After a lot of hours staying up last night, this morning I found the solution. It was surprisingly easy.
When I get back to work on Monday I will post the code that hopefully will help other people in the future. It didn’t have to be as complicated as we were going from before. Especially not with VS/PS 3.0+. Fixed-function pipeline is all but obsolete these days. -M From: osg-users [mailto:[email protected]] On Behalf Of Robert Osfield Sent: Saturday, April 14, 2018 2:15 AM To: OpenSceneGraph Users <[email protected]> Subject: EXTERNAL: Re: [osg-users] Writing texture coordinates on a mesh without going through traversal code? HI Marlin, I would hope that you can implement what you need without getting your hands dirty with internals of the OSG. It sound like you want something similar to osg::ClipPlaneNode. Have a look at osgclip to see how it works. Robert. On 13 April 2018 at 22:30, Rowley, Marlin R <[email protected]<mailto:[email protected]>> wrote: Hello! I’m trying to generate my own texture coordinates (on-the-fly) by having a callback that runs when a piece of geometry intersects my object. So for example, I create a realworld frustum and when my frustum has a shader that’s bound to some arbitrary object in the world. When my frustum intersects this object, I would like to generate texture coordinates on this object based on how far or near I am to the frustum’s near/far planes (it’s perspective frustum). We had the following code for doing this: void ViewshedOSG::updateTextureCoordinates() { // write the plane equation for all 3 planes // that make up the camera view frustum. We can // then access this from the shader to test whether // we are in the frustum's volume or not. osg::Matrixd projection = mCamera->getViewMatrix(); mTexGen->setPlanesFromMatrix(projection * osg::Matrix::translate(1.0, 1.0, 1.0) * osg::Matrix::scale(0.5f, 0.5f, 0.5f)); // Bring our models viewspace coordinates back // into model space coordinate of the camera frustum osg::RefMatrix * refMatrix = new osg::RefMatrix (mCamera->getInverseViewMatrix() * *_cv->getModelViewMatrix()); // Copy the texture generator to the mesh where you // can index it's coordinates from the ViewshedID _cv->getRenderStage()->getPositionalStateContainer()-> addPositionedTextureAttribute (mId, refMatrix, mTexGen.get()); } However, this code was based on a cull visitor calling this function from a callback. I have my own callback and it’s not based on a visitor. Is there anyway to get the objects modelview matrix() without calling it from a cull visitor? Also only need to write the ‘addPositionedTextureAttribute’ on the geometry in order to access the coordinates through a shader. I’m trying to keep this simple. Am I in the right direction? Thanks, -M ---------------------------------------- Marlin Rowley Software Engineer, Staff [cid:[email protected]] Missiles and Fire Control 972-603-1931 (office) 214-926-0622 (mobile) [email protected]<mailto:[email protected]> _______________________________________________ osg-users mailing list [email protected]<mailto:[email protected]> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
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