Hi Josef,
On Sat, 2006-02-11 at 11:40 +0000, Josef Grunig wrote:
>
> I've noticed a great render speedup after your last changes in
> ShadowMapViewport. Thank you Dirk too, for the hint.
>
> Although this improvement I think I'll have to inherit the class and
> change it accordingly to my needs. In fact the projectShadowMaps
> method runs my heavy shaders for every light, which is not the nicest
> (and fastest) behaviour. It would be nicer to selectively use two
> different shaders: a fast one for shadow manipulation (used for
> multipass rendering in light loop) and the heavy one used one time to
> render the whole scene with the accumulated shadows.
That's a good idea.
> Here come some (few) questions...
>
> Is MaterialSwitch a good choice to switch fast from a shader to another?
> Could MultipassMaterial be a better choice?
Thinking about it, here's my recommendation: Switching just Materials
would be possible, but tricky, as you have to have a way to store the
alternative Materials somewhere, and it still has to work if they are
not specified.
A more general approach (and some apps/games use this) would be to have
a fully alternative scene/geometry for the shadow rendering (and while
we're at it, have a separate scene to create the shadow map on a lower
detail level in the first place). This could be implemented by having
multiple roots in the Viewport, but personally I would use a different
traversal mask for each pass (map creation, base render, shadow render).
By defaulting them to -1 things would work unchanged right now, and it
allows changing only select objects when necessary. As an additional
bonus it would be the least implementation effort. :)
Andreas, what do you think?
> When inheriting ShadowMapViewport class must I inherit the base class
> too? or extend directly the base class? ( I'm quite new to C++ and
> OpenSG )
Deriving from OpenSG classes works a little differently from "normal" C+
+. Let's see if Andreas accepts my idea above, maybe you don't have to
worry about it. ;)
Dirk
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