Hi there, I have a rather strange problem that I would like to tackle using OSG, I wonder if anyone could offer some advice on whether it is possible or not?
In brief, the application I am working on must allow users to detect what parts of a scene containing in a large CAD model are and are not visible (ie: occluded) when viewed from certain vantage points. To do this, I am currently using line of sight calculations from my eye (Detector) to points spaced equally throughout the scene in three dimensions, however this is proving very slow. I could simplify my problem greatly by saying "If the vantage point, or camera, was a light source, what is the shadow map on a horizontal plane placed at a certain level?" I was thinking to use osgShadow functionality to generate a shadow map on a horizontal plane of a size/location that I specify, given a light source at the vantage point. However, I would need to get the bitmap (or other representation - I need to know what parts of the plane are in shadow and what parts are not) of the shadow map back in order to process it. Some questions: - Is it possible to get the shadow map out as a texture or bitmap? - Would the OSG fail to deliver a shadow map if I used osgShadow and the graphics card didn't have the correct features (i.e. would it fall back to CPU rendering?) - What method of shadow mapping would best suit this problem? The above operation does not have to be real time, but it has to work on a variety of hardware, ranging from onboard Intel graphics to top-end video cards. I would greatly appreciate something that defaulted to render on CPU as opposed to a GPU only technique, and I must be able to get the shadow map applied to the plane out as a bitmap. Thank you! Andrew ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15950#15950 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
