Here I am with an example that explains my scenario.
I commented the code with questions, hoping this is clearer.
Code:
// This is a core road that contains all data and must not know of OSG at all
class Road
{
// This method builds vertices and indexes based on the internal data
// It must not use osg::Arrays but C arrays or std::vectors
void getPointsAndConnections(float*& oPoints, int& oPointSize, int*&
oConnections, int& oConnectionSize);
}
// This class can not use OSG classes either (so no osg::Array here)
class WaveFrontWriter
{
// This method is pleased to use getPointsAndConnection() since it
returns useful data.
// Here I can use a C array of an std::vector, not osg::Array
void write(Road* road) {
road->getPointsAndConnections(vertices, vsize, indices, isize);
// here vertices, vsize, indices, isize are used for writing
the file ...
}
}
// Here is the 3D representation of the road
class OsgRoad
{
// This method is also pleased to use getPointsAndConnection() of Road
core class
void draw(Road* road) {
road->getPointsAndConnections(vertices, vsize, indices, isize);
osg::Geometry* geometry = new osg::Geometry();
// how to use incoming C arrays (or std::vectors would be also
nice) in the following call?
geometry->setVertexArray(<what here?>);
// the following call luckily accepts C arrays but ...
// 1) does it make a copy of the passed C array? (if so, that
means memory duplication in my case)
// 2) if not, is it responsible of deallocation?
addPrimitiveSet(new
osg::DrawElementsUShort(osg::PrimitiveSet::TRIANGLES, isize, indices));
}
}
Thank you in advance.
Gianni
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=60435#60435
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