Re: Mapping movie on to sphere

• Subject: Re: Mapping movie on to sphere
• From: "Wesley Smith" <email@hidden>
• Date: Mon, 28 May 2007 20:47:54 -0700
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By saying it only maps power of 3 textures do you mean thte texture
coordinates only range from [0, 1] in both directions?  If that's the
case, the simple solution is to scale your texture matrix by the
dimensions of the rectangular texture.

//bind texture
glMatrixMode(GL_TEXTURE)
glScalef(texWidth, texHeight, 1);

//draw sphere

wes

 Hello,

I am trying to use a modern Mac OS X approach to texture map frames of a QT
movie onto a gluSphere.

Here is what I do.

- I grab the frames with QTVisualContextCopyImageForTime
- I then create and setup the OpenGL texture
with CVOpenGLTextureCacheCreateTextureFromImage
- I can then happily map to GL_QUADS and such but I cannot then map to a glu
quadratic (gluSphere)

It seems gluSphere only lets us map a power of 2
texture.  CVOpenGLTextureCacheCreateTextureFromImage
returns a non power of 2 texture.  Does anyone know another way to get
texture data from QTVisualContextCopyImageForTime for
glTexture2D or such.  Would I have to go back to a GWorld to try and do this
and create a power of 2 texture?

Is there a way to use gluSphere with a non power of 2 texture.  I am not
sure I know my math well enough to create my own sphere and handle my own
mapping.

Any other ideas?

Matt Veenstra
tribalmedia.com

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