Comments on: 2. OpenGL Window Reshaping (Version 2.0)

By: Swiftless

Swiftless — Sat, 24 Jul 2010 10:09:17 +0000

Hi Imrn,

These tutorials are meant to be more on OpenGL and Computer Graphics, not so much on the maths. If you want to know in detail about the different matrices then I suggest you look around.

The identity matrix is just an empty matrix with 1′s along the diagonal.

Cheers,
Swiftless

By: Imrn

Imrn — Sat, 24 Jul 2010 08:37:22 +0000

“we are going to reset our Projection Matrix to the identity matrix ” .. what is an identity matrix? did you explain that in last tutorial?

By: Swiftless

Swiftless — Wed, 21 Jul 2010 10:08:02 +0000

Hey Juan,

I target these tutorials a lot more towards Windows developers because thats where a majority of people come from. However I personally am a fan of OSX development, which also requires manual linking when using gcc, but I tend to stick to using Frameworks these days which are OSX only. I used to include “GL/glu.h” in my applications, but find that I don’t need to anymore as it’s included in other header files that I use (on Windows anyway). It’s good to hear you got it working though.

Cheers,
Swiftless

By: Juan Bolter

Juan Bolter — Wed, 21 Jul 2010 07:43:42 +0000

Hi,

I’m following your tutorial with Ubuntu Linux. All the programs are working perfectly, but compiling them has been a little tricky.

Of course, I know I have to include “GL/glut.h” and link “-l glut”. It worked perfectly in chapter 1.

Now, gluPerspective() is not declared in “glut.h”, it is declared in “glu.h” and my compiler complains about it. I also have to link “-l GLU” to compile the program described here.

I don’t know how things work in Windows, but I believe “GL/glu.h” should be included in the programs.

Hope it helps.

By: kutti

kutti — Fri, 16 Jul 2010 18:49:05 +0000

hi
I have a doubt in this document.
In this reshape function you used two matrix(projection and modal )
what is the necessity to use like this?

By: yuuki

yuuki — Mon, 10 May 2010 02:14:56 +0000

Great tutorial!
One ponint to mention: fov is in y direction

By: Micke

Micke — Tue, 04 May 2010 18:37:09 +0000

Hi, I just wanted to say that this is probably the best opengl tutorial on the web, thanks!

By: Aman

Aman — Sat, 01 May 2010 08:58:34 +0000

Tutorials are very helpful.

i tried all practically.. working fine.

By: Swiftless

Swiftless — Wed, 28 Apr 2010 04:56:50 +0000

Hi Expora,

Most of the methods we create for use with GLUT are void methods, yes. Meaning they don’t return a value.

Also, the method “reshape” can be called whatever you like, as long as it takes the same types of parameters.

I’m not sure what you mean about the int’s. Do you just want to know what they are? An int is short for integer, and an integer is just a whole numer (no decimal points).

Cheers,
Swiftless

By: Expora

Expora — Wed, 28 Apr 2010 00:54:57 +0000

Hello there!! Quick question: Methods always use void at the beginning? also do you assing the reshape name on your own or does it means something in GLUT? Also I would like to know what exactly int. I mean I’d like to know what I’m writing so I can go do things of my own someday

Thanks,
Expora