Modified SceneNode::FrustumCull

Now provides an implementation which will test the bounding volume
against the frustum (Basic frustum culling)
Is now const
Disabled face culling on sprites


Former-commit-id: 5cb7a94b38ef8b0ffa5a78f16f5ef65a59ab375d

src/Nazara/Graphics/SceneRoot.cpp

@@ -36,13 +36,6 @@ bool NzSceneRoot::IsDrawable() const
 	return true;
 }
 
-bool NzSceneRoot::FrustumCull(const NzFrustumf& frustum)
-{
-	NazaraUnused(frustum);
-
-	return true; // Toujours visible
-}
-
 void NzSceneRoot::Register()
 {
 	NazaraInternalError("SceneNode::Register() called on SceneRoot");