Hi Rasmus,
On Thu, 2004-02-12 at 07:01, Rasmus Agerholm wrote:
> Hi,
>
> How can I control which geometry in the scene to render for each eye,
> given that I want to disable some geometry for left eye and some other
> for the right eye?
>
> We want to use some image based rendering (IBR) in an OpenSG app. A
> texture is created for each eye each frame. Each texture should then be
> mapped on the inside of a deform sphere. The sphere has the same shape
> for each eye and can thus be a shared Geometry core under different
> MaterialGroups. Am I right so far? Now, I need to disable the left
> sphere when rendering the right eye and vice versa. My thought was to
> put the two MaterialGroups under a switch node and then control the
> choice of the switch node depending on which eye is about to be drawn.
> But how do I find out which eye is about to be drawn? And, is there a
> better way to do this?
given that you use a pretty recent version of the code, there actually
is. ;)
You can use traversal masks. Each Node has a mask (accessible via
setTravMask(), getTravMask()), which kind of replaces the active flag.
In addition every Viewport also has a traversal mask (same calls). By
default both have all bits set. During rendering (actually for any
Action), when the binary AND of the Viewport's mask and the Node's mask
are 0, the Node and all its children are ignored.
Given that left and right eye use separate viewports, this allows you to
do what you want.
Hope it helps
Dirk
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