On 10/02/2010 03:46 PM, Alejandro Castellanos wrote:
Hi, I've been away from Pyglet for a while and now that time allows
I'm back again, trying some Opengl stuff. I've been following some
tutorials online (the NeHe ones) but I found something rather odd:
I'm trying to draw a pyramid with no base and I make it spin around
the Y axis, and everything seems just fine except for the fact that
the drawing of the faces seems rather odd, appearing superimposed over
each other, from the last one to the first one. The pyramid spins just
fine but it all just looks weird.
I've tried drawing the individual faces individually, and then they
seem just fine. Everything goes out the window when I try to draw them
all in the same scene, though.
The faces have different colors so maybe that's it, but the problem is
that I can't see where I'm going wrong.
What you describe sounds like the depth buffer isn't working. I see
where you enable depth testing and where you clear the depth buffer, but
missing is the request for a depth buffer to be allocated. If I
remember correctly, some implementations give you one whether or not you
ask for it, and some only if you explicitly ask for it. So I always
make it explicit. Here's a bit cut and pasted from one of my apps that
runs on both Windows and Linux.
config = Config(double_buffer=True, depth_size=24)
pyglet.window.Window.__init__(self,
config=config,
vsync=True,
width=width,
height=height,
resizable=True)
Hope that's the problem...
Gary Herron
Code is Below:
---------------------------------------------------------------------------
CODE START:
import pyglet
import math
from pyglet.gl import *
#Direct OpenGL commands to this window.
#window = pyglet.window.Window(resizable=True)
window = pyglet.window.Window(200, 200, resizable=True);
def ReSizeGLScene(width, height):
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0,width/height,0.1,100.0);
glMatrixMode(GL_MODELVIEW);
def InitGL():
glShadeModel(GL_SMOOTH);
glClearColor(0.0, 0.0, 0.0, 0.0);
glClearDepth(1.0);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
return True
def PyramidExmpl():
glBegin(GL_TRIANGLES);#Drawing using triangles
#DRAWING FRONT FACE.
glColor3f(1.0,0.0,0.0);#---------------------------RED
glVertex3f(0.0,1.0,0.0);#Top
glVertex3f(-1.0,-1.0,1.0);#Bottom Left
glVertex3f(1.0,-1.0,1.0);#Bottom Right
#DRAWING RIGHT FACE.
glColor3f(0.0,0.0,1.0);#---------------------------BLUE
glVertex3f(0.0,1.0, 0.0);#Top
glVertex3f(1.0,-1.0,1.0);#Bottom Left
glVertex3f(1.0,-1.0,-1.0);#Bottom Right
#DRAWING BACK FACE.
glColor3f(0.0,1.0,0.0);#---------------------------GREEN
glVertex3f(0.0,1.0,0.0);#Top
glVertex3f(1.0,-1.0,-1.0);#Bottom Left
glVertex3f(-1.0,-1.0,-1.0);#Bottom Right
#DRAWING LEFT FACE.
glColor3f(1.0,1.0,0.0);#---------------------------YELLOW
glVertex3f(0.0,1.0,0.0);#Top
glVertex3f(-1.0,-1.0,-1.0);#Bottom Left
glVertex3f(-1.0,-1.0,1.0);#Bottom Right
glEnd();#Finished Drawing The Pyramid
#----------------------------------
#----------------------------------
class Rots(object):
def __init__(self):
self.tri = 0
self.quad = 0
def DrawGLScene(rtri,rquad):
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);#Clear The
Screen And The Depth Buffer
glLoadIdentity();#Reset The Current Modelview Matrix
glTranslatef(-1.5,0.0,-6.0); #Move Left 1.5 Units And Into The
Screen 6.0.
glRotatef(rtri,0.0,1.0,0.0);#Rotate The Triangle On The Y axis
( NEW )
PyramidExmpl()
"Defino un objeto que guarda unas variables r.tri y r.quad"
"para que puedan ser accesadas desde adentro de una funcion."
#----------------------------------Definiendo mis variables globales.
r=Rots()#En este objeto guardo los valores de mis variables globales.
r.tri=0.0
r.quad=0.0
#----------------------------------
def sumadorangulos(dt):#Es la funcion que se encarga de sumarles
valores.
r.tri = r.tri+2.0
if r.tri>= 360:
r.tri=0
@window.event
def on_draw():
DrawGLScene(r.tri,r.quad)
ReSizeGLScene(window.width, window.height)
pyglet.clock.schedule_interval(sumadorangulos, 1.0/60.0)#lo que hecha
a andar el sumador.
pyglet.app.run()
---------------------------------------------------------------------------
CODE END.
Sadly I can't really tell where my mistake is.
Anyways, any help would be greatly appreciated. Thanks in advance.
