Hi,
On 06/12/2011 04:47, bart gallet wrote:
Hi Chris
Thanks for your reply.
Yeah, it definitely feels like an off-road excursion ;) Last time I
used OSG was when you still had to use Performer.
I am trying to simulate a bunch of autonomous systems/agents that use
cameras to control their actions (they can see each other, the
environment, etc.). Each agent runs on a separate thread, and needs
to render the scene according to its own point of view.
Must rendering happen in parallel, or just the processing by each agent?
I have three different rendering requirements:
1) Each agent must render their camera according to their POV at each
instant and simultaneously. This rendering must be performed
off-screen because their images are meant for processing by each
agent's control system and are thus not intended for human eyes. This
has not yet been implemented - I was planning on using a viewer in
each agent's thread that renders to a pBuffer.
You can consider FBOs and read back to CPU as well. Having many viewers
means that you have a copy of all scene elements per agent. You can use
a viewer with as many FBO cameras as you need, these can then share the
scene elements. You can sync the generation of the FBO textures using a
concurrent queue per agent.
2) General overview view Display (for human eyes only): Here I want
to render the scenery for general visualization where I can chose any
vantage point. I have this working, as a viewer in my main thread.
3) Agent view Display (for human eyes only): Here I want to select an
agent and see its camera feed. I was thinking of using one viewer
here and then when selecting an agent to see its POV, I would slave
the viewer's camera with the viewer in the agent's thread - it's here
where things are going wrong.
If you use FBOs you can just select the texture for the agent you want
and place it as a texture on a quad in the main camera.
As you correctly inferred, I am a bit lost because I assumed that for
each agent's camera view I must instantiate a separate viewer and I
was doing this in each agent's thread.
If you have any good advice for me, I certainly would greatly
appreciate it!
One other thing you can try is force the viewer(s) to execute single
threaded and see if it makes a difference.
rgds
jp
Cheers, bart
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