[osg-users] Smooth shading

[Zahraa Yasseen]

Hello,

I'm working on a project in which we need to output 3D objects  
constructed by the code. We generate vertices and then triangles. When  
the normal binding is per_primitive, every thing works fine. When it  
is per_vertex, either the osgProducer::Viewer crashes or the result is  
incorrect (badly shaded triangles). Here is the code:

if(geo->getNormalBinding() == osg::Geometry::BIND_PER_PRIMITIVE)
{
for(unsigned int i=0; iat(A) - vertices->at(B);
osg::Vec3f CB = vertices->at(B) - vertices->at(C);
osg::Vec3f N = BA ^ CB;
N.normalize();
normals->push_back(N);
}
}

else if(geo->getNormalBinding() == osg::Geometry::BIND_PER_VERTEX)
{

for(unsigned int i=0; igetNumElements(); i++)
normals->push_back(osg::Vec3f(0.0, 0.0, 0.0));

for(unsigned int i=0; iat(A) - vertices->at(B);
osg::Vec3f CB = vertices->at(B) - vertices->at(C);
osg::Vec3f N = BA ^ CB;
(*normals)[A] += N;
(*normals)[B] += N;
(*normals)[C] += N;
}

for(unsigned int i=0; igetNumElements(); i++)
normals->at(i).normalize();
}

thanks



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[osg-users] Analyzing the Topology of osg::Geometry

[Zahraa Yasseen]

Hello,

Is there a way to tell which vertices (of the vertex array) in an  
osg::Geometry instance belong to a given face i, regardless of the  
PrimitiveSet type?
The query is:
Given face Id (i), and vertex index (j=0,1,2 if the face is a  
triangle) in this face,
What is the index of this vertex in the VertexArray of the osg::Geometry?

Thanks






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