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Questions tagged [tree]

A tree is a hierarchical data structure that simulates a tree structure with a set of linked nodes.

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0answers
75 views

Cache friendliness of AABB-Tree: binary vs N>2

I found that state-of-the-art physics engines like Bullet and Box2D all use binary AABB-Tree for broad-phase collision detection. I wonder, did anybody tested AABB-tree with >2 branches per node ? ...
0
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1answer
187 views

Implementation a Prefix tree or Trie in Unity C#

I am trying to make a word game in unity. The game shall be an online game with 4-6 players. The gameplay is somewhat like this: Suppose 4 players are playing the game- p1, p2, p3, and p4. All ...
2
votes
1answer
396 views

HAA* / HPA* C++ Algorithm / Help

so I have been working on implementing a form of HPA* but i'm really struggling to decide what to do next. https://webdocs.cs.ualberta.ca/~mmueller/ps/hpastar.pdf <- here is the article. There is ...
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1answer
90 views

How can I rotate childrens nodes with parent node in cocos2dx?

Consider the following code... ...
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0answers
43 views

Unity-Error within Tree Editor

I've been making a tree in with the Tree Editor in Unity, and for a realistic effect, I need to make all the leaves face a general direction, the problem is that most of them don't face that direction ...
0
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1answer
47 views

Tree of objects in 2D space - children relative to parent

Question How do we track the position of child objects, relative to a parent? Context I have a simple structure that keeps track of a point in space, along with zero or more children: ...
-1
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1answer
205 views

How do I create a horizontal tech tree for the web? [closed]

I'm currently using bootstrap, jQuery and KnockoutJS to create a simple game. I would like to make a horizontal tech/research tree where the player can do research to get bonuses. I found a CSS ...
-1
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1answer
1k views

Does Unity support tree data structures?

I'm really confused. Is it possible to use trees like binary trees or data structures in Unity? I need to introduce artificial intelligence into my game, and use the A* algorithm.
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0answers
160 views

Unity has extreme lag while deleting trees from terrain

So I have a terrain with sections of water in it. I just placed a whole bunch of trees in the scene with mass place. However, it spawned trees in the water which I obviously want to remove. But when I ...
3
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0answers
95 views

Simulating wind (vertex bending)

Right now I'm using the Crytek vegetation bending technique, vertex colors control how much force is applied to the branches, leafs and trunks. I have it working and it looks nice but I'm just using ...
2
votes
1answer
343 views

How to ensure a condition in a behaviour tree when processing following nodes?

Example tree (Source): As far as I understood, a sequencer iterates over the children until one failed or all are successful. If one children returns "running", the sequencer will start to process ...
0
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1answer
601 views

Why do KD trees put the median split exactly on a point?

I've understood that KD tree split points using the median while cycling on each axis. I've also understood that at each node traversal, a nearest search must use a sphere to store to nearest neighbor ...
2
votes
1answer
250 views

How to set indent spacing of a tree in libGDX scene2d?

I've been trying to create a customized UI using scene2d library in libGDX. However I am having troubles as I'm trying to set a custom indent spacing on my Tree object. I have tried to search for the ...
2
votes
1answer
182 views

How to prune an AI game tree for a game like Magic?

I've got a game tree structure for my AI that I need to trim in order to gain some depth. It is a single-player game of perfect information. A good analogy would be a single-player game of Magic the ...
1
vote
1answer
46 views

Texturing in blender

I am texturing a tree in bender using the sappling add-on, when i put the tree bark texture (which is saved as .jpg) the texture looks stretched and wierd, ive used "Use UV for mapping" on the curve ...
4
votes
1answer
84 views

What is a viable way of finding the minimum swaps to sort numbers in pyramid?

I have made a game that consists of a pyramid of hexagons with numbers from 00 to 99 randomly positioned in groups of 6, 10 or 15 elements. Now, I'm working to create an auto-solver but for the last 2 ...
1
vote
1answer
240 views

QuadTree Checking Collision With Different Levels of Nodes

I am making a QuadTree for a 2D Platformer. Researched on it and I managed to make a pretty good one where each node stores its 4 SubNode and there's a MAX_OBJECTS for each Node and MAX_LEVELS which ...
2
votes
2answers
355 views

AI for Shogi, dealing with high branching factor due to drop rule [closed]

I'm writing a Shogi program with a computer player in Java from scratch as my undergradute dissertation project. Due to the drop rule, when the computer player captures a few pieces, the branching ...
3
votes
2answers
440 views

Implementing A* with Heap tree

I'm trying to implement Heap into my A* algorithm, However I'm having trouble with implementing one method. The Contains method. Which checks if the heap array has a specific node in it or not. I don'...
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votes
1answer
1k views

Should I use octree or quadtree for my spacial data structures? [closed]

I would like to know the advantages and disadvantages of using octree or quadtree for spacial data structures? In a 3d gaming setting would you ever need more than 4 children nodes? Does it take ...
2
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0answers
1k views

Binary Space Partitioning of 3d Triangle Mesh (for finding nearest points)

I'm writing a Binary Space Partitioning (BSP) tree for the purpose of optimizing finding the nearest point on the surface of a 3d triangle mesh with respect to another point. I'm currently following a ...
6
votes
2answers
3k views

Game AI. Behavior Trees struggles

I'm writing a bot for a MOBA game as final project. Game status is read directly from the screen (that's the requirement). Now I have come to the AI part. On the first steps it started as some ...
7
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2answers
566 views

Handle movement with QuadTree

I currently have a QuadTree that contains all my Entities. It works well and I've optimized it pretty decently, but the one thing that hurts is that I am removing ...
3
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1answer
463 views

Behavior trees - Can sequences and selectors contain conditions?

I can't wrap my head around this. Is it legal for parent nodes to contain additional logic ?
5
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3answers
512 views

Algorithm for creating tree-like network structures

I'm trying to procedurally model tree-like network structures with the following properties: A root with variable number of nodes A variable depth of nodes When graphically laid out, edges or nodes ...
3
votes
1answer
814 views

Placing nodes in a graph in a random but readable way

I'd like to create a simple map from vertices and lines - you know, like a usual graph. A tree, to be precise. To select the location of the next point that comes from one, I use a simple circle-...
0
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1answer
269 views

Enumerating full game tree for small board game

I am trying to list all the possible positions in a small board game (nannon) (using C++) So far I have decided to split it into two parts, the pieces that are in home positions and end positions (...
2
votes
1answer
885 views

Behavior Trees and Animations

I have started working on the AI for a game, but am confused how I should handle animations. I will be using a Behavior Tree for AI behavior and Cocos2D for my game engine. Should my "...
16
votes
5answers
10k views

Generated 3d tree meshes

I did not find a question on these lines yet, correct me if I'm wrong. Trees (and fauna in general) are common in games. Due to their nature, they are a good candidate for procedural generation. ...
14
votes
2answers
4k views

Why are trees shining in background?

Currently I am creating a forest scene in the dark, and the trees are shining far away, but when I get close they are fine. I have the shaders set to "Nature/Tree Soft Occlusion [bark/leaves]", but ...
3
votes
1answer
991 views

Tic-Tac-Toe game AI

I'm looking into creating a simple tic tac toe/noughts and crosses game in Actionscript3 and am trying to understand the ideas behind the AI used in a game like this. I've seen some simplistic ...
1
vote
1answer
198 views

Dynamic quadrees

Recently I started writing a Quadtree for creature culling in Opendungeons game. Thing is these are moving points and the bounding hierarchy will quickly get lost if the quadtree is not rebuild very ...
6
votes
2answers
10k views

How do I optimize searching for the nearest point?

For a little project of mine I'm trying to implement a space colonization algorithm in order to grow trees. The current implementation of this algorithm works fine. But I have to optimize the whole ...
3
votes
2answers
478 views

Is there a way to balance a binary tree continuously?

In my game I have a tree of objects in 3D space, to which new objects are frequently added. Over time, the binary tree becomes unbalanced which is a big problem for efficiency as the tree can become ...
2
votes
2answers
2k views

Algorithm to generate small tree-like branches?

I'd like to seed a void map with "branches" of sine waves or any other waveform. Something like: Know of any algorithm? Has to be one to generate trees or something like that.
11
votes
5answers
9k views

2D Spatial partitioning alternatives to spatial hashes and quadtrees

I've been trying to implement a spatial partitioning algorithm in my game, but both spatial hashes and quadtrees aren't what I'm looking for. My level size is not supposed to have a limit (only Int32 ...
2
votes
2answers
231 views

Help computing visibility in old 3d game format

I am trying to compute visibility in an old 3d file format. I am using a BSP tree have finally gotten everything built and traversable. Now I don't have any sort of PVS, potentially visible set to ...
21
votes
1answer
17k views

Behaviour tree code example?

http://altdevblogaday.org/2011/02/24/introduction-to-behavior-trees/ Obviously the most interesting article I found on this website. What do you think about it ? It lacks some code example, don't ...
3
votes
2answers
848 views

Efficiently representing a dynamic transform hierarchy

I'm looking for a way to represent a dynamic transform hierarchy (i.e. one where nodes can be inserted and removed arbitrarily) that's a bit more efficient than using a standard tree of pointers . I ...
20
votes
3answers
9k views

How to procedurally (create) grow an artistic (2D) tree in real-time (L-System?)

Recently I programmed an L-system module, It got me interested further. I am a Plants vs Zombies junkie as well, really liked the concept of Tree of Wisdom. Would love to create similar procedural art ...
9
votes
2answers
1k views

Efficient structure for representing a transform hierarchy

Can anyone suggest a memory efficient way to represent a tree of matrices, for example in a hierarchy model? I'm particularly keen to preserve data locality, and I suspect a structure-of-arrays (...