displaying a HUD that follows the camera

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Started by Lufian April 11, 2004 06:35 PM

4 comments, last by Lufian 20 years ago

122

Author

April 11, 2004 06:35 PM

Hi, I did a HUD that follows the camera, but it requires two translate and two rotate to follow the movement of the camera. I know that it will fail me later on, so I was wondering if there is an easier way of doing this without translating and rotating. I suspect glOrtho to be used, but I do not know in which context. Thank you

BDePesa

412

April 11, 2004 07:54 PM

Correct, go into ortho and render your text, then go back to perspective

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Lufian

122

Author

April 11, 2004 08:02 PM

hummm yeah.... I assumed that, its just the fact of doing that doesn''t work. Let say I want a square to always be in front of the camera even with the camera rotating and translating, any small snippet of code would be appreciated.

GamerSg

378

April 11, 2004 09:45 PM

Do this after all your 3d stuff has been rendered.

glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(......); //or use gluOrtho2d
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
//Draw your HUD here

Usually people will save their existing matrices using glPush() glPop but it is not required.