cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   tape2
   Member

   My game features lots of explosions, and I would like for each explosion to leave an impact crater behind. I have a big sprite as my background, from a png file. I also have the crater graphic as a png.

   I can simply add a crater sprite for each explosion. This doesn't seem smart, as there might be hunderds of explosions, and thus hunderds of sprites. This might become very slow.

   My question: is it possible to somehow draw the craters onto the background png? That way there wouldn't be a performance hit, no matter how many craters there are.

   How would I do this?

   Thanks for reading!

   Posted 2 years ago #
2. 

   Lam
   Member

   You would use the RenderTexture class. slipster216 just added an example of it in the svn trunk. Take a look.

   Posted 2 years ago #
3. 

   natanavra
   Member

   Lam has the right idea.

   I used it once, in UIKit stuff... I added alot of .pngs into one background and after each 10-15 times of adding, I draw the context into a UIImage, deleted every subview and added a single UIImage... very useful!

   Well, you should check the RenderTexture, it should give the same effect as context draw (Quartz).

   ~ Natanavra.

   Posted 2 years ago #
4. 

   zombie
   Member

   anybody knows how fast renderTexter is? As fast as drawing to the screen?

   Posted 2 years ago #
5. 

   abitofcode
   Moderator

   Check out the gorillas source (see the welcome post at the top of the forum for details of where to find source examples). Buildings are deformed by fireballs in a similar manner to what you are describing.

   Posted 2 years ago #
6. 

   tape2
   Member

   Thanks everyone, I got it working using RenderTexture. Works beautifully!

   Much appreciated!

   Posted 2 years ago #

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