Hi Paul, > If your eye is close to the shadow but far from the caster, then the > shadow > covers a large pixel area and the caster covers a small pixel area. This > is > exactly the case where you would want to use two different levels of > detail > for the caster -- one to create a high resolution shadow, and the lower > LOD > for the final rendered image of the caster. If the LOD distances are > configured correctly, the user should not notice that the caster and > shadow > were rendered with two different levels of detail; the difference will be > lost in screen resolution.
Ok, I agree its ideal solution. But in practice I don't know where the receivers are. Infact receivers in this ideal case are not specific objects but random pixels on the screen. Shadow from one object can be cast on multituple objects in the scene. So implemnting proper metrics for LOD selection sounds like scene analysis approach. This would be an overkill considering my real time framerate requirements ;-) Cheers, Wojtek ----- Original Message ----- From: "Paul Martz" <[EMAIL PROTECTED]> To: "'OpenSceneGraph Users'" <[email protected]> Sent: Tuesday, February 26, 2008 5:12 PM Subject: Re: [osg-users] Problem to consider: Shadow maps and LOD computation >> > Ideally, you would want the shadow caster's LOD to be >> selected based >> > on the distance between the eyepoint and the shadow >> receiver, wouldn't >> > you? >> >> Actually I would like it to be based on the distance from >> eyepoint to Shadow Caster (measured in main camera view >> space). If its based on / or adjusted to distance from Shadow >> Receiver we may end up with one LOD used on main camera >> screen and other LOD used in shadow map texture. Ie shape of >> shadow would be different than object on the screen casting >> the shadow. > > That might be the solution you want, but I don't think it's a good general > solution for proper rendering. > > -Paul > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
