AS3 2D Ray Casting For Collision Detection
Ray casting is a technique usually used in 3D worlds (often for rendering). Ray casting is exactly what it implies a ray is cast from a start point until it hits something (or a max length, so the computer doesn't die). Ray casting in 2D is great for collision detections, especially fast-moving objects (bullets). In this post, we will learn the basics of ray casting in 2D, then we will apply it to bullets in a...
AS3 Metaballs
Metaballs came around in the 90s with the Demo Effect. What made metaballs so cool was their squishy look and melding into other nearby metaballs. First I found a nice article and stuck it into as3. It turned out really slow (even after the suggested optimizations), but it worked and made some cool pictures. A metaball, according to that article, is defined by the function: F(x,y) = R / sqrt( (x-x0)^2 +...
A* Heuristics
In the first post on A*, we explored the theory behind A*. Then we took A-star and put it into code. Now we will look at different heuristics for A* and how they affect the path. The Manhattan Method This is the heuristic function we used in our implementation of A*. The Manhattan method will get you to the end cell in the least steps, but it doesn't always guarantee the shortest path. It will usually give the...
Sierpinski Triangle
The Sierpinski Triangle is a famous fractal named after the mathematician who discovered it. It is made up of nested triangles that get smaller and smaller. If you were to zoom in, you would see the same image (though it may be translated) and you could zoom forever and never find the end. So, how do you create the Sierpinski Triangle in AS3? First you have to know how to do recursion. Recursion is...
Sierpinski Triangle
The Sierpinski Triangle is a famous fractal named after the mathematician who discovered it. It is made up of nested triangles that get smaller and smaller. If you were to zoom in, you would see the same image (though it may be translated) and you could zoom forever and never find the end. So, how do you create the Sierpinski Triangle in AS3? First you have to know how to do recursion. Recursion is...
AS3 Metaballs
Metaballs came around in the 90s with the Demo Effect. What made metaballs so cool was their squishy look and melding into other nearby metaballs. First I found a nice article and stuck it into as3. It turned out really slow (even after the suggested optimizations), but it worked and made some cool pictures. A metaball, according to that article, is defined by the function: F(x,y) = R / sqrt( (x-x0)^2 +...
Putting A* into Code
In yesterday's post on the basics of A star, we explored the theory behind A*. Today we will take that theory and put it into code. Because A-star uses a grid made up of cells, we need some classes to store that data. First the cell class: [as3] package com.rocketmandevelopment.grid.cells { import flash.display.Graphics; public class Cell { public var f:Number = 0; public var g:Number = 0; public var...

Archive for June 25, 2010

AS3 MetaDiamonds

Jun 25th

Posted by rocketman in AS3

2 comments

MetaDiamonds, Click to watch!

The next MetaShape is the MetaDiamond. Its like the metaballs and the MetaEllipses but with diamonds instead.

The MetaDiamonds will be based off the filter used in the previous MetaShape posts. It will use pixelbender.

MetaDiamonds are defined by this functions:

M(x,y) = R / ( |x0-x| + |y0-y| )

X and Y are the current pixel location. x0 and y0 are the diamonds coordinates.

Now using the filter from the previous posts, it is pretty easy to put this into pixel bender

<languageVersion : 1.0;>

kernel MetaDiamonds
<   namespace : "com.rocketmandevelopment";
 vendor : "Rocketman Development";
 version : 1;
 description : "MetaDiamonds";
>
{
parameter float More >

2D, AS3, Effect, Math, Pixel Bender, SWF

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- Using Ray Casting with Shapes February 16, 2011
- Detecting Collisions with SAT November 29, 2010
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Archive for June 25, 2010

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