Hi All,
I will like to change a SimpleMaterial of a loaded VRML file in OpenSG. I have
tried three different method and still havent found I a solution and will be
very grateful for any help.
I will like to get a node e.g SQR_1 from my VRML model (code below) and be able
to change to the emission color in opensg.
1. When I try to retrieve the Geometry of SQR_1 in this case I always get a
null pointer.
NamedNodeFinder f; //from tutorial 10loading
NodePtr sqr = f(scene, "SQR_1");
GeometryPtr geo = GeometryPtr::dcast(seed->getCore());
2. modifying the NamedNodeFinder class of 10loading tutorial to return a
GeometryPtr of SQR_1, changing the material of the Geometry doesnt affect the
scenegraph.
Action::ResultE isGeometry(NodePtr& node){
// this tests if the core is derived from geometry
if (node->getCore()->getType().isDerivedFrom(Geometry::getClassType())){
geo = GeometryPtr::dcast(node->getCore());
return Action::Quit;
}
return Action::Continue;
}
3. If I use the MaterialGroup of the node all the other objects of the
scenegraph are changed which is not what I want.
Can some one help
<pre>
Viewpoint {
position 3 2 10
}
Group {
children [
# Ambient lighting
DirectionalLight {
direction 0 2 -1
intensity 0.2
ambientIntensity 0
},
#SQUARES
DEF SQR_1 Transform {
translation 0 0 0
children DEF SQUARE Shape {
appearance Appearance {
material Material {
emissiveColor 0 0 0
transparency 0.0
}
}
geometry Box { size .5 0.1 .5}
}
},
DEF SQR_2 Transform { translation 2 0 0 children USE SQUARE },
DEF SQR_3 Transform { translation 4 0 0 children USE SQUARE },
DEF SQR_4 Transform { translation 6 0 0 children USE SQUARE },
DEF SQR_5 Transform { translation 1 0 1 children USE SQUARE },
]
}
GeometryPtr geo = GeometryPtr::dcast(seed->getCore());
if(geo==NullFC){
SLOG<<"Geometry NULL "<<endLog;
return;
}
SimpleMaterialPtr sm = SimpleMaterial::create();
beginEditCP(sm, SimpleMaterial::EmissionFieldMask |
SimpleMaterial::LitFieldMask);
{
sm->setLit(false);
sm->setEmission(Color3f( 0,0,1));
}
endEditCP (sm, SimpleMaterial::EmissionFieldMask |
SimpleMaterial::LitFieldMask);
beginEditCP(geo, Geometry::MaterialFieldMask);
{
geo->setMaterial(sm);
}
endEditCP (geo, Geometry::MaterialFieldMask);
</pre>
thanks
chenzo
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