Core Scene Graph Data Structures in C++
Group
The Group class is implemented as a subclass of the Node class. Any Group node is allowed to be a child of any other Group node, as long as the directed graph defined by the parent-child relationships does not have cycles. The Transform class and the SceneGraph class are implemented as subclasses of the Group class.
This is how the Group node is defined in the VRML'97 Standard.
Group {
MFNode children []
SFVec3f bboxCenter 0 0 0
SFVec3f bboxSize 1 1 1
}
This is the public interface to the Group class as defined in the DGP2023 implementation.
class Group : public Node {
public:
Group();
virtual ~Group();
vector<pNode>& getChildren();
Node* getChild(const string& name) const;
int getNumberOfChildren() const;
pNode operator[](const int i);
void addChild(pNode child);
void removeChild(pNode child);
Vec3f& getBBoxCenter();
Vec3f& getBBoxSize();
float getBBoxDiameter();
void setBBoxCenter(Vec3f& value);
void setBBoxSize(Vec3f& value);
void clearBBox();
bool hasEmptyBBox() const;
void appendBBoxCoord(vector<float>& coord);
void updateBBox(vector<float>& coord);
virtual void updateBBox();
virtual bool isGroup() const;
virtual string getType() const;
};