Hi Sanat,
I want to place a model of a truck over a 3D terrain that I created from DEMs
and navigate the truck over the 3D terrain using my keyboard. However I am
having trouble trying to think about what I need to do to get this done.
I can give you general pointers but to go into any detail you'll need to
do some research on the web...
You need the following:
1. Your terrain model. You mention you want to create it from DEMs, you
can use VirtualPlanetBuilder to do this.
2. Your truck model. You can use any of a range of modeling tools to
create this, or download one from the web, or get someone to make it for
you... If you want the wheels to turn you'll need to have them under
transform nodes that you can control independently of the main model.
3. To place the truck and make it move on the terrain you can do it in a
variety of ways, simple to complex and crude to accurate. It can go from
simple raycasts at the wheels (which you can do with straight OSG code -
look at osgUtil::IntersectionVisitor) to leveraging a physics and
collision detection engine to get more realistic and smoother results (I
won't suggest any but look at the end of my e-mail address for a hint ;-) ).
4. As for keyboard control, it depends on what you choose for 3, you can
just control the truck directly with an OSG event handler (have a look
at osgGA::GUIEventHandler) or at the other end of the spectrum you'd be
able to give throttle settings that would drive the vehicle's gear box
and give appropriate speed to the wheels (once again using the physics
toolkit I won't name ;-) ).
I'm not here to advertise anything, just telling you you have a range of
options and it depends on your needs and timeframe.
In any case, you can search the web or the OSG examples (in the sources
if you've downloaded those) for some of the class names I've given above
to get you started.
Hope this helps,
J-S
--
______________________________________________________
Jean-Sebastien Guay jean-sebastien.g...@cm-labs.com
http://www.cm-labs.com/
http://whitestar02.webhop.org/
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