Because in the osg implementation (that I have anyway), it looks like
the parent of the node is used for setting the state. This seems to be
true in my experimenting. If I just applied the state change to the
node I wanted affected by the state change, it did not seem to work.
void RenderLeaf::render(State& state,RenderLeaf* previous)
{
// don't draw this leaf if the abort rendering flag has been set.
if (state.getAbortRendering())
{
//cout << "early abort"<<endl;
return;
}
if (previous)
{
// apply matrices if required.
state.applyProjectionMatrix(_projection.get());
state.applyModelViewMatrix(_modelview.get());
// apply state if required.
RenderGraph* prev_rg = previous->_parent;
RenderGraph* prev_rg_parent = prev_rg->_parent;
RenderGraph* rg = _parent;
if (prev_rg_parent!=rg->_parent)
{
RenderGraph::moveRenderGraph(state,prev_rg_parent,rg-
>_parent);
// send state changes and matrix changes to OpenGL.
state.apply(rg->_stateset);
}
On Apr 15, 3:07 pm, "Thrall, Bryan" <[EMAIL PROTECTED]>
wrote:
> Judie wrote on Tuesday, April 15, 2008 4:58 PM:
>
> > I had to add in some buffer group nodes ahead of the ones I wanted to
> > apply a state change to and so now it works great.
>
> Out of curiosity, why couldn't you just add the state change to NodeC instead
> of adding buffer group nodes?
>
>
>
>
>
> > On Apr 14, 11:54 am, "Robert Osfield" <[EMAIL PROTECTED]>
> > wrote:
> >> What you are trying to do should work, but without the code for
> >> setting the
> >> different stateset to the appropriate nodes I can't say what exactly
> >> the
> >> problem is. The fact that you refer to NodeCParent looks suspect,
> >> you
> >> should apply directly to NodeC as NodeCParent is NodeA...
>
> >> On Mon, Apr 14, 2008 at 7:36 PM, Judie Stanley
> >> <[EMAIL PROTECTED]>
> >> wrote:
>
> >>> This is an exisiting project.
> >>> Here is the basic node structure:
>
> >>> Root
> >>> |
> >>> NodeA
> >>> / \
> >>> NodeB NodeC
>
> >>> I want to disable writes to the color buffer before Node A, and
> >>> then I don't want to enable them until Node C. That way, Node A,
> >>> and Node B are drawn but only the depth buffer is updated, but then
> >>> when Node C is drawn, both the color buffer and the depth buffer
> >>> are updated.
>
> --
> Bryan Thrall
> FlightSafety International
> [EMAIL PROTECTED]
> _______________________________________________
> osg-users mailing list
> [EMAIL
> PROTECTED]://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph...-
> Hide quoted text -
>
> - Show quoted text -
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