I’m getting into some AI programming and i was looking around for some concepts for implementing some reusable AI logic. i came across finite state machine, hierarchical task network, and behavior trees.
Cause AngryAnt has made a really nice implementation of behavior trees in unity i started investigating in behavior trees.

I began collection information about behavior trees and writing it down. perhaps it can help other people as well.

Building blocks of behavior trees

A behavior tree is made of several components that are attached to each other. There are a couple of different components that each has specific properties.

To control the flow there are three components : Sequence, Selector, Parallel.
For preforming actions there are two components : Action, Decorator.

below a short description of each component:

Sequences

A sequence start running and ticks the first child (from left to right). if the child return success the sequence continues its execution and ticks the next a child can also return running. return running will cause the sequence to return running and the next time the sequence is called the child that was running is called.
If all child would return success the sequence executes 1,2,4,3. When the sequence finishes the return result is success.

if a child fails then the sequence stops and also returns failure and the next time the sequence will start with the first child.

Selectors

A selector starts running and ticks the first child. if a child returns success then the selector will return success also. if a selector returns Failure the selector will move on to the next child and return running.
if a selector reaches the end of its child the it return failure and the next time it will start at the first child.

Parallel

A parrallel component will tick all it’s childs the same time, unlike the sequence and selector (those will tick its child one by one).

Decorators

When a decorator is ticked its method or property get will get called.

- if a decorator returns Success it’s child will get called. the result of that child will be returned.
- if a decorator returns Failure it’s child will not be called . the result of the decorator will be
Succes.
- if a decorator returns Running the child will be called. the result of the decorator will be
Running.

Actions

When a action is ticked it’s method or property get will get called. whatever value return from the method or propertgy get will be the result.

i tried implementing a scattering algorithm, hope you like it.

Here is an example :

Please view the full post to see the Unity content.

for usage instuctions press read more.

Download : Skydome version 1.0 (2460)

A Note: Please try to improve the script and let me know if you use it! for questions just mail me.

To use this do the following:

- Import the package in you project
- Drag the skydomeMesh into the scene. i saw a little error here. but for now you have to make the scale x,y,z to 100.
drag the aScattering material on the skydomeObject.
Set textures (cloud/stars)
Set wind direction (try to see what it does)

- Create a directionalLight and name is “Sun”
now drag the Sun.cs to the directional light, set the property “maincontroller” to the skydome controller object

- Create and emptyGameobject and name it “Skydome controller”
Drag the skydome2.cs to the skydomeController object (NOT THE SPHERE)

Set the properties of the skydomescript:
sunLight > the directionallight object.
Skydome > the sphere object.
cam > your camera.

You can try some settings if you press “TAB”.

perhaps some customization is needed to fit your needs. if ytou have questions just drop me a mail.

http://www.unifycommunity.com/wiki/index.php?title=SplashScreen

A new version of wordpress and a new layout.  this can have some effect on tutorial. i’ll try to fix them asap

i was searching fro a nice 3 engine an finally i think i have something that i can work with.
It’s called Unity3D and it rocks! go check it out at www.unity3d.com

As brand new year to come. hope you all have a very creative year!
Currently i’m working on some 3D engines, perhaps a nice result will come out of this. and then i can share some thoughts on producing 3D content for 3DEngines. subjects such as texture baking, use of materials, etc

have fun!!

So i made page 2 of part 2. this covers some modelling.
The page is realy messy and i’m feeling like i need a bit more space for my pages. so maybe i’ll install a different  theme for this blog

I hope to continue with this. well see what happends.

If you liked the tutorials on my website i’m very happy. but i would like you to aks if you have any requests for tutorials.
For example “finish the interior tutorial dude! ”

Please reply on this message with your requests!