quadtree

I have been looking for a quadtree/quadtree node implementation on the net for ages. There is some basic stuff but nothing that I would be able to really use it a game. My purpose is to store objects in a game for processing things such as collision detection. I am not 100% certain that a quadtree is the best data structure to use, but from what I have read it is. I have already coded a Red-Black tree, but I don't really know if the performance would be good enough for my game (which will be an adventure 3rd person game like Ankh). How would I write a basic but complete quadtree class (or

I'm in the process of creating an offline Slippy Map using QML and their new QtLocation module (>=Qt5.4). I managed quite easily to display the tiles with an offline cache. Now I would like to add custom data to this map (a list of ~7000 airports). This huge list would have to be clustered depending on the zoom level (for performance and readability reasons, unless the QtLocation has built-in "optimizations"..?. What would be to most elegant/best way to achieve this, staying as close as possible to the Qt/QML APIs? I saw some interesting stuff about a similar approach here: How to handle large

I'm currently working on a 2D shoot them up type of game, and I'm using a quad tree for my collision detections. I wrote a working quad tree that correctly pushes my actors into the nodes/leaves they belong to in the tree. However, I've got a few problems. Firstly, how do I actually use my quadtree to select against which other objects an object should test collisions ? I'm unsure about how this is done. Which brings up a second question. Say I have an object in node that is not a neighbour of another node, but that the object is large enough that it spans a few node, how can I check for an

I have recently learned about binary space partitioning trees and their application to 3d graphics and collision detection. I have also briefly perused material relating to quadtrees and octrees. When would you use quadtrees over bsp trees, or vice versa? Are they interchangeable? I would be satisfied if I had enough information to fill out a table like this: | BSP | Quadtree | Octree ------------+----------------+------- Situation A | X | | Situation B | | X | Situation C | | | X What are A, B, and C? Nils Pipenbrinck There is no clear answer to your question. It depends entirely how your

I have a set of 100 to 200 points (x,y). I have to check which ones fall within a particular distance of the others. The particular distance is fixed for the entire program, say 50. Say point 1 falls within the range of points 5,7,25,90,96,105...etc. Similarly point 2 falls within range of 23,45, etc... Storing objects for locating by x,y coordinates Here QuadTree is suggested, but it can be used to get all the points within a bounding rectangle. But how to get all points within a bounding circle? there is a method which returns a point closest to a lat/long within a maximum distance, but how

I have implemented a quadtree in Mathematica. I am new to coding in a functional programming language like Mathematica, and I was wondering if I could improve this or make it more compact by better use of patterns. (I understand that I could perhaps optimize the tree by pruning unused nodes, and there might be better data structures like k-d trees for spatial decomposition.) Also, I am still not comfortable with the idea of copying the entire tree/expression every time a new point is added. But my understanding is that operating on the expression as a whole and not modifying the parts is the

It appears that a certain project of mine will require the use of quad-trees, something that I have never worked with before. From what I have read they should allow substantial performance enhancements than a brute-force attempt at the problem would yield. Are any of these python modules any good? Quadtree 0.1.2 <= No: unable to execute in Python 3.1 QuadTree <= Yes: simple while working with rectangles quadtree.py <= No: no support for needed operations EDIT 1: Does anyone know of a better implementation than the one presented in the pygame wiki? EDIT 2: Here are a few resources that others

I'm trying to determine a fast way of storing a set of objects, each of which have an x and y coordinate value, such that I can quickly retrieve all objects within a certain rectangle or circle. For small sets of objects (~100) the naive approach of simply storing them in a list, and iterating through it, is relatively quick. However, for much larger groups, that is expectedly slow. I've tried storing them in a pair of TreeMaps as well, one sorted on the x coordinate, and one sorted on the y coordinate, using this code: xSubset = objectsByX.subSet( minX, maxX ); ySubset = objectsByY.subSet(