Hi, i am a beginner openGL programer,and i have the following problems: 1)i am rotating a triangle with the following code: glRotatef(.... triangle1(); when i place a second triangle after the first, it rotates too.How can we prevent this happening???? 2)Is there a way to align an object to the screen?For example put a font to the upper left corner? 3)Is there a camera we can use ?Or there is only the default??? thanks for your time! Ironhell3

store the current modelview matrix with...

"glPushMatrix();".

call your rotate and draw functions for the first triangle.

then restore the current modelview matrix with...

"glPopMatrix();".

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1) Jenova got #1.
2) Yes. Setup an orthographic project matrix and set the dimensions to those of your window or the screen. Like this:

glViewport(0, 0, (GLsizei) Width, (GLsizei) Height);glMatrixMode(GL_PROJECTION);glLoadIdentity();glOrtho(0.0f,(GLfloat)Width,(GLfloat)Height,0.0f,-1.0f,1.0f);glMatrixMode(GL_MODELVIEW);glLoadIdentity();

3) Think of the projection matrix as the "screen" matrix and the modelview matrix as the "camera" matrix. The modelview matrix (using glTranslate?, glRotate?, and glScale) is your camera.