Hi Jason,
If you are using OSG 1.2 there is a bug with OverlayNodes when they are
not set up to perform continuous updating that prevents the overlay from
displaying. The overlay should show up if you add the following line
to the code where the overlay node is set up:
overlayNode->setContinuousUpdate(true);
This bug is fixed in SVN so you could also try updating the OverlayNode
files.
Mike
Jason wrote:
Hi,
I tried out this example. I got it compiled, and removed the #if so it
would force it to run using the createOverlay code. Forgive me if I am
missing something, but I don't see any grid lines being rendered on
the terrain. Does this particular example have a bug? I've tested this
a few times and can verify that the overlay code is running but I just
don't see the grid lines.
Thanks,
Jason
On 4/20/07, *Jason* <[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>>
wrote:
Jason,
This looks very promising. Thanks for the tip.
Jason
On 4/20/07, *Jason Beverage* < [EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
Hi Jason,
OverlayNode would definitely be of use to you here. There
used to be an example of exactly what you are trying to do in
the osgspheresegment example, but it is no longer in there.
You can see it here though:
http://www.openscenegraph.org/viewcvs/examples/osgspheresegment/osgspheresegment.cpp?rev=1.18&view=markup
<http://www.openscenegraph.org/viewcvs/examples/osgspheresegment/osgspheresegment.cpp?rev=1.18&view=markup>
Just do a search for createOverlay and you'll find it.
Good luck!
Jason
------------------------------------------------------------------------
*From:* [EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>
[mailto:[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>] *On Behalf Of
*Jason
*Sent:* Friday, April 20, 2007 10:36 A
*To:* [email protected]
<mailto:[email protected]>
*Subject:* [osg-users] Advice on laying gridlines on a terrain
Hi,
I'm currently developing an application that loads in either
an FLT or a TXP terrain. I'm interested in laying down grid
lines where the spacing can be changed by the user. Maybe I'm
overthinking this, but I'm looking for a way to basically lay
the gridlines down directly on the 3 dimensional terrain.
Is there something in OSG that allows someone to lay a texture
upon another texture or am I better off using shaders,
or something else to achieve this effect?
I've checked out various examples...would OverlayNode or
TexGenNode be of any use to me?
Thanks,
Jason
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