Add Up and Down transition about epgltransitionview HOT 4 OPEN

In the drawTransitionFrameWithTextureFrom:(GLuint)textureFromView textureTo:(GLuint)textureToView method of DemoTransition2.m, change the vertices and texcoords to the following for vertical transition:]

GLfloat vertices[] = {
    -1, 1.5,
    -1, 0,
    1,  1.5,
    1,  0,
    -1, 0,
    -1, -1.5,
    1, 0,
    1, -1.5,
};

GLfloat texcoords[] = {
    0, 0,
    0, 0.5,
    1, 0,
    1, 0.5,
    0, 0.5,
    0, 1,
    1, 0.5,
    1, 1,
};

also find the lines:
glRotatef(v*180.0, 0, 1, 0);
glRotatef(180.0, 0, 1, 0);

and replace them with
glRotatef(v*180.0, 1, 0, 0);
glRotatef(180.0, 1, 0, 0);

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How do I change the reference line for rotation to the top of the screen (instead of the center) to achieve a Rolodex like animation?

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Actually I think EPGLTransition might be overkill for "flat panel" animations. Best for that would be using CALayers efficiently. i.e. see http://www.voyce.com/index.php/2010/04/10/creating-an-ipad-flip-clock-with-core-animation/
EPGLTransition is better if one would like to do "non-flat panel" animations, like a page curl, curtain cloth etc

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Thanks for your help Edward! I'll give it a try.

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