help with OF OPENGL PERSPECTIVE

advanced
#1

Hi

well, i works with openGl things and now migrated to openframeworks, really i’m trying to make a game with of (some simple app to works with this framework).

i have a problem i am tried to migrate opengl into of and all works OK, i learn so much things but this question can’t make solution.

well my question is how to keep the same perspective in all place, i load a 3d object, with 3d class, and to make a simple sphere with opengl in of, but in diferent places the ball same diferent, looks the picture.

Perspective 3

Perspective 2

Perspective 1

the big question es how to make that the ball looks iqual in all the places of my screen, if you seee i put a soccer ball, bus if a make a simple game, looks cray if the team to the left have a oval BIG BALL, and the rigth team have a LITTLE CIRCLE Ball.

Well i some one works woth this and can helpme i willbe greatfull

PD: Sorry for my english is the maximun that i can write… if not understand can askme…

o and if is posible the same light, for ilumitaned diferent balls same way (THIS IN REAL LIFE IS IMPOSIBLE BUT I THINK THIS WILL MAKE A BETTER EFFECT).

Thx

thanks toall OF people …

#2

well i find this

gluLookAt(eyex,eyey,eyez,centerx,centery,centerz,camerax,cameray,cameraz);

but how it works in OF?

this is posible…

#3

I think what you are seeing is the perspective distortion from the opengl camera. You might want to use an orthographic opengl camera.

Also, have a look at ofx3DUtils addon, it wraps functionality for 3D opengl stuff, including basic camera manipulation.

#4

Hi

thx grismus, well y use this addon but make me crazy

this is a example that i am tried to make

http://www.youtube.com/watch?v=QnDMqYjN-…-re=related

I have all, but the ball looks some ugly, in the corners.

whe y use the 3dutils, the other things like camera or like, image for staidum, too change with the ball and make the program crazy…

:wink: any idea, i need only the ball, y use 3dmodelloder for charge the 3d ball and physics to the rest, onlye need that the ball appear equal in all places…

#5

OK forget the addon, you don’t really need it. Just use opengl orthographic projection, either glOrtho() or gluOrtho2D()

http://glprogramming.com/red/chapter03.html#name3

#6

Ok finaly with your help all works OK :wink: thx grimus

#7

Thanks johnavila2! Exactly what I needed. I reduced it to this and that works for me.

  
glEnable(GL_DEPTH_TEST);  
glMatrixMode(GL_PROJECTION);  
glLoadIdentity();  
glOrtho(0, ofGetWidth(), ofGetHeight(), 0, -ofGetHeight(), ofGetHeight());  
glMatrixMode(GL_MODELVIEW);  
glLoadIdentity();  
//draw stuff