Wojciech,
Thanks for the pointer, that code looks interesting. I can override the
CullVisitor at the scene root so I don't have quire the same problem. I
must admit this is not first time I have wished for a general per node
cull callback in osgUtil::CullVisitor. It would also be a way to apply
receives shadow state in a more specific fashion.
Roger
Wojciech Lewandowski wrote:
Roger,
I had similar dilemma at some point.
I was thinking about overridding cull visitor but had problem how to
substitute original cull visitor with my class in the middle of
cull traversal. Finally I adopted other approach. Once Cull Visitor
traverses the scene all drawbles land in render bins. Instead of
overriding cull visitor I scan generated render bins and compute
Bounding box around drawables that landed in renderd bins. If you are
interested in details look at MinimalCullBoundShadowMap code. Its
there.
Cheers,
Wojtek
-----
Original Message -----
Sent:
Friday, October 17, 2008 12:55 PM
Subject:
[osg-users] Simple sunlight shadow technqiue
I am experimenting with a simple sunlight shadow technique using the
osgShadow model and basic depth shadows. I would like to set up the
shadow casting camera so that I end up with a shadow texture that is a
near as possible "filled" with the shadow casting objects as culled by
the LOD nodes in the scene using the the inherited viewpoint. It seems
to me that the best place to set up this bounding information is during
the main scene cull traverse that is done in my(most) shadow technique
prior to the render to shadow texture cull traverse. I want to avoid
having to manage the placing and removing of cull call backs on every
shadow casting geode, which may be different as the user manipulates
the scene. The only way I can think of doing this is to derive my own
CullVisitor and override the Geode apply function. Have I missed
something here? Is there a better way to do it? I know the LISP shadow
techniques have a number of complex ways of doing this but I am trying
to implement something simple that uses inbuilt OpenGL functionality
wherever possible.
Roger
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