I've tried posting this a couple of times, and it disappears. It went through yesterday as a reply to a test post, so I'm going to try again with the proper subject.
I'm looking to add extra visual realism to surfaces using shaders. Grass, gravel and dirt are some of the obvious candidates, but there could be others. I am hoping to use a type of Parallax Mapping. I have a few algorithms of basic Parallax Mapping, but they fall apart at glancing angles close to the ground (where the user viewpoint will frequently be). Tatarchuk's Parallax Occlusion Mapping: http://ati.amd.com/developer/SIGGRAPH05/Tatarchuk-ParallaxOcclusionMapping-Sketch-print.pdf http://ati.amd.com/developer/gdc/Tatarchuk-ParallaxOcclusionMapping-FINAL_Print.pdf http://ati.amd.com/developer/gdc/2006/GDC06-Tatarchuk-Parallax_Occlusion_Mapping.pdf Seems to solve many of the issues. The GDC 06 paper with the allegedly improved algorithm only talks about HLSL and DirectX. I'm interested in checking this algorithm out to see how it performs (I'm designing shaders in RenderMonkey) but I've had a hard time finding working GLSL source for anything newer than the original Parallax Shader from 04 and earlier. I don't want to write and debug an implementation from scratch just to find out it doesn't do the job, so I was hoping to find a working implementation somewhere, but am not finding one. Anyone seen one? It looks like a heck of a technique and could really be used to great purpose in landscapes, and well, just about anything with surface detail. Anyone know where to find something like this? Also, I'm interested in other sources of canned shaders. I'm not trying to do cutting-edge research, I'm just trying to apply the best available technology to a visualization problem to give the best results without reinventing the wheel. -- Chris 'Xenon' Hanson, omo sanza lettere Xenon AlphaPixel.com PixelSense Landsat processing now available! http://www.alphapixel.com/demos/ "There is no Truth. There is only Perception. To Perceive is to Exist." - Xen _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
