cocos2d for iPhone

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

1. 

   devindazzle
   Member

   I love how simple it is to create games with Cocos2d. I know it is a 2d engine but I have started to wonder if it would not be possible to actually include 3d models etc in Cocos2d (like done i fx New Super Mario Wii and many other games).

   I have seen a few forum topics covering methods to use 3d in Cocos2d but I did not really understand fully what would make it difficult to do 3d in the draw method of a CCNode or similar as it gives access to the GL Context.

   Now, if I want to start adding my 3d assets to a cocos2d game I need to know exactly how the GL context is set up and of cause how to reset state it again to ensure proper functionality of cocos2d. Can anyone explain what is actually needed to efficiently enable 3d drawing? What flags are set per default in Cocos2d v2.0 (I assume the depth buffer is not enabled and that orthographic projection is used). Is this true?

   Hope to have some pointers from more experienced users :)

   Posted 3 months ago #
2. 

   Panajev
   Member

   Well, there is Cocos3D for a 3D approach in Cocos2D style, but since Cocos2D supports a depth buffer and a 3D projection already... you can already do 3D effects.

   Posted 3 months ago #
3. 

   devindazzle
   Member

   While Cocos3d is an excellent addition it is overkill for what I want to do. Second, it is still in "early" development and while it seems stable for core functionality I think I will be able to do this myself with fairly limited code and that way getting a chance to really start leaning OpenGL ES 2.0 without having to write code that does exactly what cocos2d is good at (scenes, layers, transitions etc).

   My only concern at the moment is what states Cocos2d 2.0 uses as default: Do I need to enable the depth buffer myself .. is it using orthographic projection meaning I will have to change that etc, what are the default drawing states etc? Just thought I might be able to get a few pointers from others who have tried this to help getting started. I know Cocos2d is not "designed" for 3d but since it is using an OpenGL ES 2.0 context anyway it should be possible to do 3d without messing up the cocos2d drawing.

   Posted 3 months ago #
4. 

   GoldenJoe
   Member

   If you want to do 3D models on a 2D plane, why not just do it with cocos3D? I don't really see what you'd gain from trying to make cocos2D do something it isn't meant to do.

   Posted 3 months ago #
5. 

   aramk
   Member

   See the draw method of CCNode.h for the default states. Cocos2d only supports EL 1.1, not 2.

   EDIT: sorry, yes cocos2d v2 does support opengl es 2.

   Posted 3 months ago #
6. 

   Steve Oldmeadow
   Administrator

   cocos3d is the thing that only supports OpenGL ES 1.1 so suggesting it as an option for cocos2d 2.0 isn't much help.

   @devindazzle - several OpenGL settings are set up when the EAGLView is created. There is the option to use an orthographic or perspective projection, you can look in the CCDirector code to see how the projections are set up. Look at the code for drawing primitives to see what states are on by default and what must be restored.

   Posted 3 months ago #
7. 

   devindazzle
   Member

   Thank you Steve and aramk :) These are pretty good pointers to know more about how the context is set up and works within Cocos2d.

   Posted 3 months ago #

RSS feed for this topic

Reply

You must log in to post.