bounding box growth

[Seven]

code to find all encompassing boundingbox of the node, including all children


is there a better method for doing this?

Code: Select all

 
    class CSDummySceneNode : public ISceneNode
    {
    public:
        aabbox3d<f32> TotalBoundingBox;
 
        CSDummySceneNode(ISceneNode* parent, ISceneManager* mgr, s32 id = -1,
            const core::vector3df& position = core::vector3df(0, 0, 0),
            const core::vector3df& rotation = core::vector3df(0, 0, 0),
            const core::vector3df& scale = core::vector3df(1.0f, 1.0f, 1.0f))
            : ISceneNode(parent, mgr, id, position, rotation, scale)
        {
        }
 
        virtual void OnRegisterSceneNode()
        {
            if (IsVisible) SceneManager->registerNodeForRendering(this);
            ISceneNode::OnRegisterSceneNode();
        }
 
        //! Renders the node.
        virtual void render()
        {
            video::IVideoDriver* driver = SceneManager->getVideoDriver();
            driver->setTransform(video::ETS_WORLD, AbsoluteTransformation);
            driver->setTransform(video::ETS_WORLD, IdentityMatrix);
 
            // for debug purposes only:
            video::SMaterial mat;
 
            // overwrite half transparency
            if (DebugDataVisible & scene::EDS_HALF_TRANSPARENCY)
                mat.MaterialType = video::EMT_TRANSPARENT_ADD_COLOR;
            driver->setMaterial(mat);
 
            // for debug purposes only:
            if (DebugDataVisible)
            {
                video::SMaterial m;
                m.Lighting = false;
                m.AntiAliasing = 0;
                driver->setMaterial(m);
 
                if (DebugDataVisible & scene::EDS_BBOX)
                {
                    driver->draw3DBox(getTotalTransformedBoundingBox(), video::SColor(255, 255, 255, 255));
                }
                if (DebugDataVisible & scene::EDS_BBOX_BUFFERS)
                {
                    driver->draw3DBox(getTotalTransformedBoundingBox(), video::SColor(255, 190, 128, 128));
                }
            }
        }
 
        virtual const core::aabbox3d<f32>& getBoundingBox() const
        {
            return aabbox3d<f32>(-1.0f, -1.0f, -1.0f, 1.0f, 1.0f, 1.0f);
        }
 
        core::aabbox3d<f32> getTotalTransformedBoundingBoxRecursive(ISceneNode* node, aabbox3d<f32> &box)
        {
            ISceneNodeList::ConstIterator it = node->getChildren().begin();
            for (; it != node->getChildren().end(); ++it)
            {
                aabbox3d<f32> box2 = (*it)->getTransformedBoundingBox();
                if (!box2.isFullInside(box))
                {
                    if (box2.MinEdge.X < box.MinEdge.X) box.MinEdge.X = box2.MinEdge.X;
                    if (box2.MinEdge.Y < box.MinEdge.Y) box.MinEdge.Y = box2.MinEdge.Y;
                    if (box2.MinEdge.Z < box.MinEdge.Z) box.MinEdge.Z = box2.MinEdge.Z;
                    if (box2.MaxEdge.X > box.MaxEdge.X) box.MaxEdge.X = box2.MaxEdge.X;
                    if (box2.MaxEdge.Y > box.MaxEdge.Y) box.MaxEdge.Y = box2.MaxEdge.Y;
                    if (box2.MaxEdge.Z > box.MaxEdge.Z) box.MaxEdge.Z = box2.MaxEdge.Z;
                }
                box = getTotalTransformedBoundingBoxRecursive((*it), box);
            }
            return box;
        }
 
        core::aabbox3d<f32> getTotalTransformedBoundingBox()
        {
            aabbox3d<f32> box(-0.5,-0.5,-0.5,.5,.5,.5);
            box = getTotalTransformedBoundingBoxRecursive(this, box);
            return box;
        }
 
    };
 

[Seven]

I should point out what I am trying....

game object class has a PrimarySceneNode of type CSDummySceneNode*;
all scenenodes of the object are a child of the primarySceneNode;
of course, then these children can have children and great grand children.
in the editor, the user can only select primarySceneNodes for editing.

something new that I am not sure how it will work out, but the need for this particular code is so the user can select the primaryscenenode using the total bounding box of all of it's lineage.

[CuteAlien]

Looks mostly fine. You can save a few lines by using aabbox3d::addInternalBox which does the adding of boxes which you did manually.