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Article Written By:
Johann Dowa

Example: Easily Implement Fast Pixel Perfect Collisions In Cocos2D

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In the past I mentioned some tutorials providing 2D collision detection techniques showing how to perform circle-to-rectangle, circle-to-circle (using UIKit), and vertex based collisions (with Cocos2D and Box 2D).

The most accurate collision method – pixel to pixel collisions – wasn’t mentioned simply because it can be brutally slow.

It is possible however to perform extremely fast pixel to pixel collisions using a pixel mask.

Steffen Itterheim has created a class known as KKPixelMaskSprite that inherits from CCSprite that automatically provides a pixel mask along with several methods for detecting collisions.

You can find the class along with an extensive tutorial on Steffen’s site here.

This looks like a terrific class for any Cocos2D developers wanting pixel accurate collisions at a decent speed.  The speed of course can’t compare to vertex based collisions with only a few vertices, but if you really want pixel perfect collisions this loks like the way to go.


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