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Newbie help! OpenGL

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Started by shaolinf November 03, 2007 07:04 PM

13 comments, last by Trenki 16 years, 5 months ago

shaolinf

116

Author

November 03, 2007 07:04 PM

Hi Guys, I'm very new to OpenGL and co, so forgive me if I ask some really draft questions! How do make a dot about 8 pixels in size. thanks

Zakwayda

2,389

November 03, 2007 07:08 PM

Quote:Original post by shaolinf
Hi Guys,

I'm very new to OpenGL and co, so forgive me if I ask some really draft questions!

How do make a dot about 8 pixels in size.

thanks

Take a look at glBegin() and glEnd() (you'll want to use the GL_POINTS enum), glVertex2*(), and glPointSize().

If you need more info than that, you may need to clarify your question a bit.

shaolinf

116

Author

November 03, 2007 07:19 PM

Thanks for the reply. Can you give me an example of that code in implementation please ?

KOzymandias

132

November 03, 2007 07:24 PM

Sugar ?

Crypter

748

November 03, 2007 07:41 PM

	glPointSize (8);	glBegin (GL_POINTS);		glVertex2f (0.0f,0.0f);	glEnd ();

This renders a pixel to the center of the screen.

If you prefer, there are alternative routines that you can use besides the glVertex2f version (For example, glVetex2i() (For integers), glVertex2iv() (Integers), et al.

shaolinf

116

Author

November 03, 2007 07:43 PM

Ah ha, thanks!

shaolinf

116

Author

November 03, 2007 07:46 PM

Ok, so I've created 2 of those squares with different co-ordinates on the screen. If I wanted to randomly move them about, how would I do that?

scorpion007

118

November 03, 2007 07:59 PM

Transform them into different places in world space before you render them.

shaolinf

116

Author

November 03, 2007 08:04 PM

What does that mean and how do I do that ?

adam_o

137

November 03, 2007 08:13 PM

This is all you need.

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Newbie help! OpenGL

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