Hi Robert,
Hmmm, now I seem to have come full circle back to the start of this thread.
lol.
If I use a hud camera, don't I then have the messy problem of making it only
render the Dragger in the scene?
Or perhaps there is a way to get main camera to render renderbins 0-10 and
the other camera to render renderbin 11?
I'm new to this render bin wizardry.
Chris.
----- Original Message -----
From: "Robert Osfield" <[EMAIL PROTECTED]>
To: "Chris Denham" <[EMAIL PROTECTED]>; "OpenSceneGraph Users"
<[email protected]>
Sent: Thursday, October 23, 2008 2:42 PM
Subject: Re: [osg-users] The best way to make some object in a scene render
after and infront everything else.
Hi Chris,
If you want to clear the depth buffer then you need to use a separate
RenderStage rather than just a RenderBin. A RenderStage is a special
RenderBin that adds the frame buffer clear prior to its traversal, and
any copy to image/texture operations after traversal. By default the
OSG has one RenderStage per Camera. So your case you'll want an
extra Camera above the subgraph you want the clear. You may place
this Camera in the scene graph or in the viewer. See the osghud
example.
Robert.
On Thu, Oct 23, 2008 at 2:30 PM, Chris Denham <[EMAIL PROTECTED]>
wrote:
Hi Robert,
Excellent! That was too easy ;-) so I have a secondary question.
Is there a way to get it clear the depth buffer between renderbins so I
can
render with depth test on? The manipulator geometry does not render
correctly over itself with the depth test switched off.
Cheers.
Chris.
Date: Thu, 23 Oct 2008 11:24:07 +0100
From: "Robert Osfield" <[EMAIL PROTECTED]>
Subject: Re: [osg-users] The best way to make some object in a scene
render after and infront everything else.
To: "OpenSceneGraph Users" <[email protected]>
Message-ID:
<[EMAIL PROTECTED]>
Content-Type: text/plain; charset=ISO-8859-1
Hi Chris,
You can achieve this affect several ways but the simplicist would
probably be to state the RenderBin number of the subgraph that you
want o overlay to a high figures, something like 11 or more to draw
after the default transparent bin, then disable the depth test so the
all fragments of the dragger are drawn.
Robert.
On Thu, Oct 23, 2008 at 10:39 AM, Chris Denham <[EMAIL PROTECTED]>
wrote:
I am trying to acheive an effect whereby some geometry in a scene is
rendered after and in front of everything else.
What I want to be able to do is show an osgManipulator::Dragger node
attached to an object in a scene, but show it infront of everything, I
guess
a bit like a HUD, but where only the Dragger is rendered on the HUD.
For anyone that has used Maya, the effect I want is similar to the
translation/rotation/scaling manipulators, i.e. where they can be used
and
seen regardless of what objects that would normally be obscuring them.
What's the best way to implement that?
The most obvious way seemed to me to create a HUD style postrender
camera
to
render the manipulator on top of the normally rendered scene. But I'm
not
100% sure how to get it to only render the manipulator in the scene. Do
I
need to use nodemasks, or do I need to move the manipulator into an
empty
HUD scene along with its local to world transform?
Neither method seemed very elegant to me, so just wondering if anyone's
got
a better idea.
Chris D.
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