3D Scenes - Game Coding Complete - page 527

{

friend class SceneNode;

protected:
ActorId m_ActorId;

std::string m_Name;

Mat4x4 m_ToWorld, m_FromWorld;

float m_Radius;

RenderPass m_RenderPass;

Material m_Material;

AlphaType m_AlphaType;

void SetAlpha(const float alpha)
{ m_AlphaType=AlphaMaterial; m_Material.SetAlpha(alpha); }

public:
const ActorId &ActorId() const { return m_ActorId; }
Mat4x4 const &ToWorld() const { return m_ToWorld; }
Mat4x4 const &FromWorld() const { return m_FromWorld; }
void Transform(Mat4x4 *toWorld, Mat4x4 *fromWorld) const;

const char * Name() const { return m_Name.c_str(); }

bool HasAlpha() const { return m_Material.HasAlpha(); }
virtual float Alpha() const { return m_Material.GetAlpha(); }

RenderPass RenderPass() const { return m_RenderPass; }
float Radius() const { return m_Radius; }

Material const &GetMaterial() const { return m_Material; }
};

void SceneNodeProperties::Transform(Mat4x4 *toWorld, Mat4x4 *fromWorld) const
{

if (toWorld)
*toWorld = m_ToWorld;

if (fromWorld)
*fromWorld = m_FromWorld;

}

All of the accessors to this class are const , which gives the read-only access I
wanted. The implementation of SceneNode will perform all of the modifying,
which is important since modifying some of these values can have repercussions
throughout the scene graph.