Comments on: iPhone Game Programming – Tutorial 2 – Image Class

By: mike

mike — Thu, 03 Dec 2009 14:51:28 +0000

Hi Exerion

I’ve not done any work on rotating around x or y. In the current Image class it would be a simple matter of using glRotate to rotate around the x rather than z axis.

The one thing that would need to be set up would be the OGLES settings to provide depth and perspective. It’s not that tough but I’ve not looked at doing that yet.

Mike

By: Exerion

Exerion — Wed, 02 Dec 2009 08:31:00 +0000

Hi Mike,

Your Image class allow to perform the Z-axis rotation of Image(Texture) but I have a following question:

How can I perform an X-axis rotation?

I have a square image that I would like to rotate in X-axis and I know that after this rotation it should look like a trapezium. How should I modify the Image class?

By: Thorsten

Thorsten — Mon, 30 Nov 2009 14:58:29 +0000

Hi Mike,
thank you again for your great tutorials!
I have a (maybe a little stupid) question: I am able to use Images when i initialize them before the main loop is executed. If i try to initialize an image within the main loop exactly the same way, i can only use ist once, next time the part of the memory is overwritten (i think ;o). I can’t figure out what the reason for this is.

Maybe an answer would help me to understand Obj-C/Pointers a lot better …

Thank you in advance,
Thorsten

By: felix

felix — Mon, 12 Oct 2009 22:53:03 +0000

Hi,
I would like to thank you for the tutorials. These are tutorials are mighty helpful :) and it is so much better when we can actually see n listen to it. I am havin a little doubt with the tutorials. I am not sure about the purpose of the offset argument in the renderSubImageAtPoint method. If “point” argument is the place from which we are going to render and it is going to be rendered till(subImageWidth,subImageHeight), then can you please tell me where we use the offset. I might have understood things incorrectly.kindly explain :)

By: youke

youke — Thu, 17 Sep 2009 14:24:32 +0000

hi mike
another chinese coming

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By: mike

mike — Wed, 19 Aug 2009 22:46:53 +0000

Hi wei lu. I’m glad you managed to get the code working and good luck with the rest of the tutorials. Thanks for the great feedback.

Mike

By: wei lu

wei lu — Wed, 19 Aug 2009 22:18:42 +0000

Sorry Mike, please ignore my previous comment. I copied your code again and then the bug is fixed. I missed some code before.

so…….. go ahead your job :D

By: wei lu

wei lu — Wed, 19 Aug 2009 21:01:35 +0000

Hi Mike,

Hello from China :)

Thanks for your tutorials, really good :)

I have a question about tutorial 2 project.

I copied and run “Tutorial 2 Project” but I got a bug. iPhone SDK reports like this:
————————————————
… …

Application Specific Information:
iPhone Simulator 3.0 (138), iPhone OS 3.0 (7A341)
*** Terminating app due to uncaught exception ‘NSInvalidArgumentException’, reason: ‘*** -[Texture2D initWithImage:filter:]: unrecognized selector sent to instance 0xd466a0′

…
————————————————-

I use iphone SDK 3.0 and Xcode 3.1.3, all code is download from your webside. Before this, I run “Tutorial 1 project” successful.

Could you give me any suggestion about this bug. Thanks again.

- wei

By: narender.mudgal

narender.mudgal — Wed, 19 Aug 2009 12:50:30 +0000

Hi Mike,
i just saw the first tutorial and it forced me to see your second one. I am in iphone application development for last one year. but not a single openGL application i created yet and for a long time i was trying to see something like it. I saw many tutorials but there are over my head. but here i liked it and getting what exactly is going on. i think now i am on the right track.