void MergeBounds(Ogre::SceneNode* node, Ogre::SceneNode* rootNode,
const Ogre::Matrix4& parentTransform, Ogre::AxisAlignedBox& aabb)
{
// Get this nodes current transform
Ogre::Matrix4 currentTransform = parentTransform;
if (node != rootNode)
{
Ogre::Matrix4 localTransform(node->getOrientation());
localTransform.setTrans(node->getPosition());
currentTransform = currentTransform * localTransform;
}
// Merge this nodes objects
Ogre::SceneNode::ObjectIterator object = node->getAttachedObjectIterator();
while (object.hasMoreElements())
{
Ogre::AxisAlignedBox localAABB = object.getNext()->getBoundingBox();
localAABB.transform(currentTransform);
aabb.merge(localAABB);
}
// Iterate through all children and call this function on them
Ogre::SceneNode::ChildNodeIterator child = node->getChildIterator();
while (child.hasMoreElements())
{
MergeBounds(static_cast<Ogre::SceneNode*>(child.getNext()), rootNode, currentTransform, aabb);
}
}
Ogre::AxisAlignedBox Renderer::CalculateBounds(Ogre::SceneNode* node)
{
// As not all scene managers guarantee a hierarchal AABB, calculate this
// ourselves using a recursive function
Ogre::AxisAlignedBox aabb = Ogre::AxisAlignedBox::BOX_NULL;
MergeBounds(node, node, Ogre::Matrix4::IDENTITY, aabb);
return aabb;
}
Ogre::AxisAlignedBox Animation::getWorldBounds()
{
Ogre::AxisAlignedBox bounds = Ogre::AxisAlignedBox::BOX_NULL;
std::for_each(mObjectRoot->mEntities.begin(), mObjectRoot->mEntities.end(), MergeBounds(&bounds));
return bounds;
}
