3D Scenes - Game Coding Complete - page 529

render pass your scene node belongs to and should hold one value from the follow-
ing enumeration:

enum RenderPass
{

RenderPass_0, // A constant to define the starting pass

RenderPass_Static = RenderPass_0, // environments and level geometry

RenderPass_Actor, // objects and things that can move

RenderPass_Sky, // the background ' behind ' everything

RenderPass_NotRendered, // objects that don ' t render but exist

RenderPass_Last // not used - a counter for for loops

};

Notice the member RenderPass_NotRendered ? You might wonder why that is in
there at all, but there is a reason. Some objects in your scene graph need to be there
so they can be included in the scene, but they aren ' t actually processed in any specific
render pass. A good example of these kinds of objects might be those that only show
up in your game editor, like trigger areas or spawn points.

— It All Starts Here

SceneNode

That ve seen the design for the ISceneNode interface and

what each scene node is supposed to implement. You

' s it for the basics. You '

ve also seen SceneNodePro-
perties and how it stores data that affects how the scene node draws. You

'

ve also
seen how the RenderPass setting groups renderable objects into broad categories of
renderability and render order.
Here

'

s the base implementation of SceneNode that inherits from the ISceneNode
interface class:

'

typedef std::vector<shared_ptr<ISceneNode> > SceneNodeList;

class SceneNode : public ISceneNode
{

friend class Scene;

protected:
SceneNodeList m_Children;

SceneNode *m_pParent;

SceneNodeProperties m_Props;

public:
SceneNode(ActorId actorId,
std::string name,
RenderPass renderPass,