Hi,
I am trying to see how big/far my objects can be in (py)opengl. I
thought there was no limit and everything should be visible but a sphere
with radius 70 and the camera is 150 units away, only half of the sphere
is visible. What is causing this? Is it plane clipping? How do I set it
so that it renders regardless of distance and size? Im not after
performance so I dont care if it is slow.
Cheers
Astan
PS: Here is the code I use:
from OpenGL.GL import *
from OpenGL.GLU import *
import pygame
from pygame.locals import *
rtri = 0.0
dlBody = None
def resize((width, height)):
if height==0:
height=1
glViewport(0, 0, width, height)
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
gluPerspective(45, 1.0*width/height, 0.1, 100.0)
glMatrixMode(GL_MODELVIEW)
glLoadIdentity()
def init():
global dlBody
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_FASTEST)
glEnable(GL_COLOR_MATERIAL)
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE)
radius = 70
color = (0.7,1.5,0.5)
dlBody = glGenLists(1)
glNewList(dlBody,GL_COMPILE)
Sphere = gluNewQuadric()
gluSphere(Sphere, radius, 32, 32)
gluQuadricNormals(Sphere, GLU_SMOOTH)
gluQuadricDrawStyle(Sphere, GLU_FILL)
glEndList()
def draw():
global dlBody
global rtri
if dlBody:
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
glLoadIdentity()
glTranslatef(0.0,0.0,-150)
glPushMatrix()
glColor3f(0.7,1.5,0.5)
glRotatef(10,1,0,0)
glRotatef(rtri, 0.0, 1.0, 0.0)
glCallList(dlBody)
glPopMatrix()
rtri+=1
if rtri == 360:
rtri = 0
def main():
video_flags = OPENGL|DOUBLEBUF
pygame.init()
pygame.display.set_mode((640,480), video_flags)
resize((640,480))
init()
frames = 0
ticks = pygame.time.get_ticks()
while 1:
event = pygame.event.poll()
if event.type == QUIT or (event.type == KEYDOWN and event.key ==
K_ESCAPE):
break
draw()
pygame.display.flip()
frames = frames+1
print "fps: %d" % ((frames*1000)/(pygame.time.get_ticks()-ticks))
pygame.quit()
if __name__ == '__main__': main()
--
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