Comments on: Environment Mapping Demo With OpenGL ES 1.1 http://gamesfromwithin.com/environment-mapping-demo-with-opengl-es-1-1 Living the indie life Tue, 15 May 2012 19:19:00 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Ernesta Fanatikė http://gamesfromwithin.com/environment-mapping-demo-with-opengl-es-1-1/comment-page-1#comment-18417 Ernesta Fanatikė Mon, 27 Feb 2012 11:23:00 +0000 http://gamesfromwithin.com/?p=561#comment-18417 I like to use models from www.cgtrader.com. I like to use models from http://www.cgtrader.com.

]]> By: This Week in iPhone News - November 20/2009 http://gamesfromwithin.com/environment-mapping-demo-with-opengl-es-1-1/comment-page-1#comment-4215 This Week in iPhone News - November 20/2009 Sat, 21 Nov 2009 02:31:00 +0000 http://gamesfromwithin.com/?p=561#comment-4215 [...] Environment mapping demo with OpenGL ES 1.1 Noel Llopis demonstrates environment mapping with OpenGL ES 1.1 as part of a chapter he recently created for the upcoming book, iPhone Advanced Projects. [...] [...] Environment mapping demo with OpenGL ES 1.1 Noel Llopis demonstrates environment mapping with OpenGL ES 1.1 as part of a chapter he recently created for the upcoming book, iPhone Advanced Projects. [...]

]]> By: Tweets that mention Games from Within | Environment Mapping Demo With OpenGL ES 1.1 -- Topsy.com http://gamesfromwithin.com/environment-mapping-demo-with-opengl-es-1-1/comment-page-1#comment-4197 Tweets that mention Games from Within | Environment Mapping Demo With OpenGL ES 1.1 -- Topsy.com Fri, 20 Nov 2009 02:22:44 +0000 http://gamesfromwithin.com/?p=561#comment-4197 [...] This post was mentioned on Twitter by Noel Llopis and sakamoto, Little White Bear. Little White Bear said: Congrats! RT @SnappyTouch iPhone Adv. Projects is out! http://bit.ly/SjqmB My chapter is env mapping w OpenGL ES 1.1 http://bit.ly/3AIna6 [...] [...] This post was mentioned on Twitter by Noel Llopis and sakamoto, Little White Bear. Little White Bear said: Congrats! RT @SnappyTouch iPhone Adv. Projects is out! http://bit.ly/SjqmB My chapter is env mapping w OpenGL ES 1.1 http://bit.ly/3AIna6 [...]

]]> By: Noel http://gamesfromwithin.com/environment-mapping-demo-with-opengl-es-1-1/comment-page-1#comment-3592 Noel Wed, 14 Oct 2009 13:19:15 +0000 http://gamesfromwithin.com/?p=561#comment-3592 Anika, If you use the normal environment mapping technique, the uvs should be updated in the hardware. You set up the uvs once to be the same as the normals, and then, every frame, change the texture matrix to the view matrix. That way you're not touching each vertex each frame, and the hardware takes care of doing the transforms for you (unless the OpenGL drive on the iPhone is silently updating them uvs in software, but I hope that's not happening). Anika,

If you use the normal environment mapping technique, the uvs should be updated in the hardware. You set up the uvs once to be the same as the normals, and then, every frame, change the texture matrix to the view matrix. That way you’re not touching each vertex each frame, and the hardware takes care of doing the transforms for you (unless the OpenGL drive on the iPhone is silently updating them uvs in software, but I hope that’s not happening).

]]> By: Anika http://gamesfromwithin.com/environment-mapping-demo-with-opengl-es-1-1/comment-page-1#comment-3587 Anika Wed, 14 Oct 2009 09:22:00 +0000 http://gamesfromwithin.com/?p=561#comment-3587 Wow this technique is a performance problem because the uv for every vertex of all the meshes, used with environment mapping, is calculated in software. For realtime animation this is not really suitable. But anyways an interesting idea. Wow this technique is a performance problem because the uv for every vertex of all the meshes, used with environment mapping, is calculated in software. For realtime animation this is not really suitable. But anyways an interesting idea.

]]> By: Anika http://gamesfromwithin.com/environment-mapping-demo-with-opengl-es-1-1/comment-page-1#comment-3574 Anika Tue, 13 Oct 2009 15:05:58 +0000 http://gamesfromwithin.com/?p=561#comment-3574 Thanks a lot for the fast answer, will try the idea. Thanks a lot for the fast answer, will try the idea.

]]> By: Noel http://gamesfromwithin.com/environment-mapping-demo-with-opengl-es-1-1/comment-page-1#comment-3572 Noel Tue, 13 Oct 2009 13:34:58 +0000 http://gamesfromwithin.com/?p=561#comment-3572 Hi Anika, You're right. The iPhone hardware doesn't support environment mapping, but you can "fake" it. The chapter I wrote for the book goes in detail exactly how I did it for Flower Garden (and it includes full source code). But you can get the overall technique from <a href="http://www.gamasutra.com/view/feature/3139/hardware_accelerated_spherical_.php" rel="nofollow">this article</a>. The technique is usually called normal environment mapping, and it relies on transforming the normals by the view matrix to get fake-y uv coordinates. Works pretty well! :-) Hi Anika,

You’re right. The iPhone hardware doesn’t support environment mapping, but you can “fake” it. The chapter I wrote for the book goes in detail exactly how I did it for Flower Garden (and it includes full source code). But you can get the overall technique from this article. The technique is usually called normal environment mapping, and it relies on transforming the normals by the view matrix to get fake-y uv coordinates. Works pretty well! :-)

]]> By: Anika http://gamesfromwithin.com/environment-mapping-demo-with-opengl-es-1-1/comment-page-1#comment-3570 Anika Tue, 13 Oct 2009 11:39:53 +0000 http://gamesfromwithin.com/?p=561#comment-3570 Hello Noel, did you implement the mapping in software? As far as I know there are limitations in ES 1.1. A.e. cube- and sphere-mapping is not supported. If so, did you solve performance issues and how? regards, Anika Hello Noel,

did you implement the mapping in software? As far as I know there are limitations in ES 1.1. A.e. cube- and sphere-mapping is not supported.

If so, did you solve performance issues and how?

regards, Anika

]]> By: This Week in iPhone News – August 7/2009 | Oh Wow ... a Blog http://gamesfromwithin.com/environment-mapping-demo-with-opengl-es-1-1/comment-page-1#comment-2610 This Week in iPhone News – August 7/2009 | Oh Wow ... a Blog Fri, 07 Aug 2009 17:38:35 +0000 http://gamesfromwithin.com/?p=561#comment-2610 [...] Environment Mapping Demo with OpenGL ES 1.1 Check out Noel’s environment mapping demo which is taken from his upcoming book iPhone SDK 3.0 Projects. [...] [...] Environment Mapping Demo with OpenGL ES 1.1 Check out Noel’s environment mapping demo which is taken from his upcoming book iPhone SDK 3.0 Projects. [...]

]]> By: This Week in iPhone News - August 7/2009 http://gamesfromwithin.com/environment-mapping-demo-with-opengl-es-1-1/comment-page-1#comment-2608 This Week in iPhone News - August 7/2009 Fri, 07 Aug 2009 14:21:12 +0000 http://gamesfromwithin.com/?p=561#comment-2608 [...] Environment Mapping Demo with OpenGL ES 1.1 Check out Noel’s environment mapping demo which is taken from his upcoming book iPhone SDK 3.0 Projects. [...] [...] Environment Mapping Demo with OpenGL ES 1.1 Check out Noel’s environment mapping demo which is taken from his upcoming book iPhone SDK 3.0 Projects. [...]

]]> By: Noel http://gamesfromwithin.com/environment-mapping-demo-with-opengl-es-1-1/comment-page-1#comment-2544 Noel Mon, 03 Aug 2009 15:02:38 +0000 http://gamesfromwithin.com/?p=561#comment-2544 Greg, I didn't make the model. My Maya skillz aren't quite up to that. I used a free model from <a href="http://turbosquid.com/" rel="nofollow">Turbosquid</a>. As far as importing it, I went the quickest, easiest way, which was to do a quick-and-dirty parsing of the OBJ file I exported (included in the sample code in the chapter). You really would want to set up a better asset pipeline than that though, but it' a start. These type of questions aren't covered in the chapter I wrote. It's just a chapter and it deals with environment mapping. I think there's another chapter in the same book that cover some of that. As for the class, I'll provide some simple mesh and texture loaders, but that won't be the emphasis of the class. Learning OpenGL (and graphics programming) from scratch in two days is a tall order, so I need to concentrate on that. Greg, I didn’t make the model. My Maya skillz aren’t quite up to that. I used a free model from Turbosquid. As far as importing it, I went the quickest, easiest way, which was to do a quick-and-dirty parsing of the OBJ file I exported (included in the sample code in the chapter). You really would want to set up a better asset pipeline than that though, but it’ a start.

These type of questions aren’t covered in the chapter I wrote. It’s just a chapter and it deals with environment mapping. I think there’s another chapter in the same book that cover some of that. As for the class, I’ll provide some simple mesh and texture loaders, but that won’t be the emphasis of the class. Learning OpenGL (and graphics programming) from scratch in two days is a tall order, so I need to concentrate on that.

]]> By: gpyles http://gamesfromwithin.com/environment-mapping-demo-with-opengl-es-1-1/comment-page-1#comment-2541 gpyles Mon, 03 Aug 2009 14:43:35 +0000 http://gamesfromwithin.com/?p=561#comment-2541 Very cool. Did you design the original model? How do you export the model data from the design app and import it to the iPhone SDK? Are these types of questions covered in the book/class? ;-) -Greg Very cool. Did you design the original model? How do you export the model data from the design app and import it to the iPhone SDK?

Are these types of questions covered in the book/class? ;-)

-Greg

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