Comments on: OpenGL GluPerspective Function In iPhone OpenGL ES http://maniacdev.com/2009/05/opengl-gluperspective-function-in-iphone-opengl-es/ ManiacDev.Com Wed, 08 Feb 2012 08:29:00 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Sio2interactive http://maniacdev.com/2009/05/opengl-gluperspective-function-in-iphone-opengl-es/comment-page-1/#comment-4738 Sio2interactive Sun, 15 Aug 2010 22:35:00 +0000 http://maniacdev.com/?p=179#comment-4738 In SIO2 I got something more simple which do the same thing, and add the _ori parameter that allows you to specify the rotation of the device in degree such as: Portrait = 0.0f Flipped = 180.0f Landscape Rigth = -90.0f Landscap Left = 90.0f Here's the function that I use: void sio2Perspective( float _fovy, float _aspect, float _cstart, float _cend, float _ori ) { float xmin, xmax, ymin, ymax; ymax = _cstart * tanf( _fovy * 3.14159 / 360.0f ); ymin = -ymax; xmin = ymin * _aspect; xmax = ymax * _aspect; glFrustumf( xmin, xmax, ymin, ymax, _cstart, _cend ); glRotatef( _ori, 0.0f, 0.0f, 1.0f ); } More info on sio2interactive.com Cheers, In SIO2 I got something more simple which do the same thing, and add the _ori parameter that allows you to specify the rotation of the device in degree such as:

Portrait = 0.0f
Flipped = 180.0f
Landscape Rigth = -90.0f
Landscap Left = 90.0f

Here’s the function that I use:

void sio2Perspective( float _fovy, float _aspect, float _cstart, float _cend, float _ori )
{
float xmin, xmax, ymin, ymax;

ymax = _cstart * tanf( _fovy * 3.14159 / 360.0f );
ymin = -ymax;

xmin = ymin * _aspect;
xmax = ymax * _aspect;

glFrustumf( xmin, xmax, ymin, ymax, _cstart, _cend );

glRotatef( _ori, 0.0f, 0.0f, 1.0f );
}

More info on sio2interactive.com

Cheers,

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