collision

I'm trying to use a quadtree for 2D collision detection, but I'm a little stumped on how to implement it. First of all, I'd have a quadtree which contains four subtrees (one representing each quadrant), as well as a collection of objects which don't fit into a single subtree. When checking an object for collisions in the tree, I would do something like this (thanks to QuadTree for 2D collision detection ): Check the object for collisions with any objects in the current node. For any subtree whose space overlaps the object, recurse. To find all collisions within a quadtree tree: Check each

I have a 10 character string key field in a database. I've used CRC32 to hash this field but I'm worry about duplicates. Could somebody show me the probability of collision in this situation? p.s. my string field is unique in the database. If the number of string fields is 1 million, what is probability of collision ? Adam Morris Duplicate of Expected collisions for perfect 32bit crc The answer referenced this article: http://arstechnica.com/civis/viewtopic.php?f=20&t=149670 Found the image below from: http://preshing.com/20110504/hash-collision-probabilities In the case you cite, at least one

I am working on a platform game in python and pygame. The entire code can be found at " https://github.com/C-Kimber/FBLA_Game ". The issue I am having is with the collision between the player sprite and wall sprites, specifically the corners. When the player is pressing a x movement key and they jump, the player either does not move, or gets stuck. Here is the collision sample: def wallCollisions(self): block_hit_list = pygame.sprite.spritecollide(self, self.walls, False) for block in block_hit_list: if self.rect.bottom >= block.rect.top and self.rect.bottom <= block.rect.top + 15: # Moving

This question already has an answer here: How to check intersection between 2 rotated rectangles? 9 answers I have a problem with collision detection in a 2D Java game. Normally, what I would do is create a getBounds() method for an object that can collide with other objects. This method would return a new Rectangle(x,y,width,height) , where x and y are the coordinates for the top-left corner of the sprite, and width and height are the width and height of the sprite. But in the game I'm currently working on, there is a "tank" controlled by the user. The sprite of this tank rotates as long as

I know there is a minute possibility of a clash but if I generated a batch of 1000 GUIDs (for example), would it be safe to assume they're all unique to save testing each one? Bonus question An optimal way to test a GUID for uniqueness? Bloom filter maybe? Antal Spector-Zabusky Yes, you can. Since GUIDs are 128 bits long, there is admittedly a minute possibility of a clash—but the word "minute" is nowhere near strong enough. There are so many GUIDs that if you generate several trillion of them randomly, you're still more likely to get hit by a meteorite than to have even one collision (from