Getting closer to having this working like I think it should, but I have noticed something.
When I have one or two objects, say the size of a car, or truck, only. The shadow map looks correct. But when I add my terrain which is approximately x = 5100 by y = 5100, I no longer see the car/truck shadows on the shadow map. Similarly, if I increase the length and width of the bottom box in the osgShadow example, I no longer see the other objects in the shadow map. I assume I am running into some shadow map texture resolution limit or something. What is going on? Tnanks, W -----Original Message----- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Jean-Sébastien Guay Sent: Tuesday, November 10, 2009 3:08 PM To: OpenSceneGraph Users Subject: Re: [osg-users] ShadowMap problem... Hi Wyatt, > Just have to ask, if you try with only one object and a ground plane > (a really simple scene) do you get the same results? I just tested, and your code seems to work. I've attached a source file which is the osgshadow example, with the main() commented out and your code in its place. Have a look, the only changes were to put the ModelThree scene as child of your m_World group and to make sure I had a manipulator, and make everything compile... You seem to be using a skydome (based on a variable called SKYDOME_RANGE in the code). You did set your skydome's node mask to ~cast right? Otherwise what you're seeing is probably your skydome's shadow being cast over everything... That's one thing about using osgShadow, you need to make sure things that you don't want to cast shadows don't have the cast shadow bit in their node mask. Also HUDs should be set that way. Keep an iron grip on your node masks or you'll have unpleasant surprises... :-) The receive shadow node mask is not used for ShadowMap classes, but you can implement a node that doesn't receive shadows by adding a case in your shader (a test on a boolean uniform that skips the shadow test) and set that uniform to true at your scene's root and false for each node that you don't want to receive shadows. And btw, osgShadow::ShadowMap is not really designed for positional lights, because they're omnidirectional and would need 6 full-scene RTT passes (like a cube map) to be totally accurate. I think (IIRC) osgShadow::ShadowMap and the ViewDependentShadow classes try to approximate a directional in that case, but the approximation breaks down if the light source is positioned inside the bounding box of the scene... You're better off either approximating the sun with a directional, or using a spot light for an interior scene. Hope this helps, J-S -- ______________________________________________________ Jean-Sebastien Guay jean-sebastien.g...@cm-labs.com http://www.cm-labs.com/ http://whitestar02.webhop.org/ _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
