OpenGL Camera

[Polo]

I'm trying to do a camera with OpenGL, but it seems to be extremely difficult. I have readed some C++ tutorials, but, for the moment, I have some troubles to make it in Purebasic, it don't seems easy to translate it... Could someone help ? Perhaps someone here have already does that and can post his code

[DarkDragon]

Uhm, you can define the view with glMatrixMode_(#GL_PROJECTION) : glLoadIdentity_() : Your Code : glMatrixMode_(#GL_MODELVIEW)
"Your Code" can be replaced by glOrtho, glViewport and so on. Look in the OpenGL tutorials.

My favorites:
1: http://nehe.gamedev.net/
2: http://gametutorials.com/
3: http://www.ultimategameprogramming.com/index2.php

And I have the OpenGL helpfile, but I don't know where you can download it.

[Polo]

I have already looked at all these tutorial, the fact is I can't make them in Purebasic, because it uses Vector, and I can't use it on Pure...

[Polo]

If you can translate the camera tutorial 3 of Gametutorials in Purebasic, well, please do it, me I can't

[traumatic]

If you can translate the camera tutorial 3 of Gametutorials in Purebasic, well, please do it, me I can't

What exactly is your problem with this?

[traumatic]

[...]because it uses Vector, and I can't use it on Pure...[...]

"Vector" is neither C nor OpenGl-related.

I'm just taking a guess here, but maybe this may bring you on the right track:

Code: Select all

Structure Vector3
  x.f
  y.f
  z.f
EndStructure

and this

Code: Select all

float Magnitude(CVector3 vNormal)
{
	// This will give us the magnitude or "Norm" as some say of, our normal.
	// The magnitude has to do with the length of the vector.  We use this
	// information to normalize a vector, which gives it a length of 1.
	// Here is the equation:  magnitude = sqrt(V.x^2 + V.y^2 + V.z^2)   Where V is the vector

	return (float)sqrt( (vNormal.x * vNormal.x) + 
						(vNormal.y * vNormal.y) + 
						(vNormal.z * vNormal.z) );
}

becomes

Code: Select all

Procedure.f Magnitude(*vNormal.Vector3)
  ProcedureReturn Sqr( (*vNormal\x * *vNormal\x) + (*vNormal\y * *vNormal\y) + (*vNormal\z * *vNormal\z) )
EndProcedure

and so on...

[Polo]

Ok, thanks, I see. But is there a way to do camera without vectors ?

[Polo]

Have troubles with translating that :

// Normalize the direction.
float dp = (float)sqrt(xLookDirection * xLookDirection + yLookDirection * yLookDirection + zLookDirection * zLookDirection);
xLookDirection /= dp;
yLookDirection /= dp;
zLookDirection /= dp;


Well, I don't know what I'm supposed to put ...

[Danilo]

Have troubles with translating that :

Code: Select all

; Normalize the direction. 
dp.f = Sqr(xLookDirection * xLookDirection + yLookDirection * yLookDirection + zLookDirection * zLookDirection)
xLookDirection / dp
yLookDirection / dp
zLookDirection / dp

[Polo]

The problem is that what Danila as wrote don't work at all... If I don't put it, (I have translated all except this), well, it works, but the camero don't always go where it is supposed to, and if I put what Danilo as wrote, well, the camera don't move
...
Does someone know how to make it works ? I have worked on it for 4 hours, and it still doesn't work

[traumatic]

The problem is that what Danila[...]

Does someone know how to make it works ? I have worked on it for 4 hours, and it still doesn't work

The problem must be somewhere else as Danilos "translation" is correct

Ok, thanks, I see. But is there a way to do camera without vectors ?

Vector-Math is one of the essentials in 3D programming. Is that what you mean?

[Polo]

Forget what I say with vectors....
Well, I join an EXE file of my camera test, and you'll see the problem :

http://www.gtnsoft.com/Pure3D.exe

To move, just use the Arrow keys...

[DarkDragon]

^^ Black. I have the same problem, when I use gluPerspective, gluPerspectivef or gluPerspective__. I don't know what I'm making wrong, because I have tryed gluPerspective with all known standardparameters of other languages.

Can you give us your code to test it?

[traumatic]

Forget what I say with vectors....

done.

Well, I join an EXE file of my camera test, and you'll see the problem :

With "Problem", do you mean seeing "nothing" or a not expected behaviour in movement?
I can't see anything on my pc at work (ATI) but it displays fine on my Geforce4 at home.

[Polo]

You see nothing ? Well... No it wasn't the problem
Well, can you try the camera with th pc where it works, and tell me what I'm doing wrong ?

For the other problem, well...

Darkdragon, do you get an error message or is it just black ??