[android-developers] Re: How to apply different textures on different faces of a cylinder
This uses a custom library, but the calls to set things like texture coordinates are pretty obvious: http://code.google.com/p/skylight1/source/browse/trunk/Skylight1Demos/OpenGL/TankedActivity/src/skylight1/opengl/tanked/TankedGLRenderer.java#162 It is changing the texture coordinates like it does because all the various rotations are little images in the same texture and it is deciding which to use: http://skylight1.googlecode.com/svn/trunk/Skylight1Demos/OpenGL/TankedActivity/res/drawable/tank.PNG This is a 2D demo, so it rotates by picking different images to use from a sprite sheet. A 3D version would use a geometry that looked more like an actual tank and actually rotate it. This uses a pair of triangles making up a square. Just rotating the square in this wouldn't look right because each sprite was drawn with a perspective and built-in lighting coming from a certain direction. On Apr 14, 11:56 pm, kirti kaul wrote: > Thanks,can you give me an example/Snippet on how to use Atlas Texture > in openGL ES? > > On Apr 13, 4:08 pm, Lance Nanek wrote: > > > Put all the images needed for texturing all the faces into a single > > texture. Then refer to coordinates inside the texture to use different > > parts of it in different places. This is called an atlas texture. I > > suppose it is also possible to draw the different parts in separate > > draw calls with a different texture object bound, or to use a second > > texture unit at the same time. > > > On Apr 12, 1:15 am,kirtikaul wrote: > > > > Hello, > > > > Can anybody tell me how to apply apply different textures on different > > > faces of acylinder?I am able to apply one texture which covers the > > > wholecylinder.But I want one texture for each face. > > > > Thanks in advance!!!- Hide quoted text - > > > - Show quoted text - > > -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] Re: How to apply different textures on different faces of a cylinder
kirti, when doing OpenGL programming it's best to actually know what you do. Just copy and pasting code will lead to more problems that you can't solve due to a missing understanding of how OpenGL works. Consider following Robert's suggestion and get your hands on the Red Book and the OpenGL Superbible. Note that you can not directly use everything found in there as those books are for desktop OpenGL which offers functionality not available in OpenGL ES. I therefore also suggest reading the tutorial series on OpenGL ES for the IPhone. The examples are written in Objective-C/C++ but should be very easy to port over to Java. http://iphonedevelopment.blogspot.com/2009/05/opengl-es-from-ground-up-table-of.html. hth On 15 Apr., 05:56, kirti kaul wrote: > Thanks,can you give me an example/Snippet on how to use Atlas Texture > in openGL ES? > > On Apr 13, 4:08 pm, Lance Nanek wrote: > > > Put all the images needed for texturing all the faces into a single > > texture. Then refer to coordinates inside the texture to use different > > parts of it in different places. This is called an atlas texture. I > > suppose it is also possible to draw the different parts in separate > > draw calls with a different texture object bound, or to use a second > > texture unit at the same time. > > > On Apr 12, 1:15 am,kirtikaul wrote: > > > > Hello, > > > > Can anybody tell me how to apply apply different textures on different > > > faces of acylinder?I am able to apply one texture which covers the > > > wholecylinder.But I want one texture for each face. > > > > Thanks in advance!!!- Hide quoted text - > > > - Show quoted text - -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en To unsubscribe, reply using "remove me" as the subject.
[android-developers] Re: How to apply different textures on different faces of a cylinder
Thanks,can you give me an example/Snippet on how to use Atlas Texture in openGL ES? On Apr 13, 4:08 pm, Lance Nanek wrote: > Put all the images needed for texturing all the faces into a single > texture. Then refer to coordinates inside the texture to use different > parts of it in different places. This is called an atlas texture. I > suppose it is also possible to draw the different parts in separate > draw calls with a different texture object bound, or to use a second > texture unit at the same time. > > On Apr 12, 1:15 am,kirtikaul wrote: > > > > > Hello, > > > Can anybody tell me how to apply apply different textures on different > > faces of acylinder?I am able to apply one texture which covers the > > wholecylinder.But I want one texture for each face. > > > Thanks in advance!!!- Hide quoted text - > > - Show quoted text - -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en To unsubscribe, reply using "remove me" as the subject.
[android-developers] Re: How to apply different textures on different faces of a cylinder
Put all the images needed for texturing all the faces into a single texture. Then refer to coordinates inside the texture to use different parts of it in different places. This is called an atlas texture. I suppose it is also possible to draw the different parts in separate draw calls with a different texture object bound, or to use a second texture unit at the same time. On Apr 12, 1:15 am, kirti kaul wrote: > Hello, > > Can anybody tell me how to apply apply different textures on different > faces of a cylinder?I am able to apply one texture which covers the > whole cylinder.But I want one texture for each face. > > Thanks in advance!!! -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en To unsubscribe, reply using "remove me" as the subject.
[android-developers] Re: How to apply different textures on different faces of a cylinder
Kirti - Get either the OpenGL superbible or the redbook. It's money well-spent. On Apr 12, 12:15 am, kirti kaul wrote: > Hello, > > Can anybody tell me how to apply apply different textures on different > faces of a cylinder?I am able to apply one texture which covers the > whole cylinder.But I want one texture for each face. > > Thanks in advance!!! -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en To unsubscribe, reply using "remove me" as the subject.
[android-developers] Re: How to apply different textures on different faces of a cylinder
Draw your faces separately with different paint objects. Thanks and Regards, Kumar Bibek On Apr 12, 10:15 am, kirti kaul wrote: > Hello, > > Can anybody tell me how to apply apply different textures on different > faces of a cylinder?I am able to apply one texture which covers the > whole cylinder.But I want one texture for each face. > > Thanks in advance!!! -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en To unsubscribe, reply using "remove me" as the subject.
