Color collison

[itsthatsguy]

Hey guys, i need some help with a coding problem and i currently have no code (because i haev no idea how to tackle this problem) Is there a way, where i import a picture, and if an object (a ball, like the ones in the physics engine i posted) hits a certain color, it rebounds ( i know the how to code rebounding code and what not, i just need a detection method) much thanks.

Cheers

[Red Sky]

You can use a color map. I'm not exactly sure how to implement it, but check out this link:
2D Collision Detection using a Color Map - Am I getting warmer? - XNA Community Forums

[itsthatsguy]

hmm there logic/coding is kidna hard to understand, anywho, thanks for helping =)

[Red Sky]

generally speaking, I think it uses per-pixel collision detection, which in and of itself is slow.

[itsthatsguy]

Hmmm, is there any faster method?

so far i have a "Ball" class it defines the, i also have a dot object, i need an easy way to see if a ball has hit a dot
and rather than looping through every dot and ball i was trying to use a color collison method, is there another type of object collison that would work well with many balls/dots?

The ball class has a bunch of info like velocity and position, who has control over it (human or computer) while the dot class is just a vector2 position.

[Red Sky]

Why don't you use a more traditional form of collision detection(instead of color collsion?)

[itsthatsguy]

i just applied an older method i had from a different physics engine,. its works pretty well, but i really wanted color collison so could import a picture of a level and have the game figure out object collison from that, rather then designing a level editor or manual entry.

[Red Sky]

With color collision, you'll still need to make a color map that corresponds to the proper collision detection. and I'm sure a physics engine would include ways to easily add collision to an object.

[itsthatsguy]

Yea, your right, i should build out a good system, so far i have been using bounding spheres, which work really well.

[Red Sky]

They're also a more efficient method of collision detection, so you won't have to worry about slow downs. Good luck on your project.

[itsthatsguy]

Thanks for all your help =)