Hi guys, I met a strange problem. I use pyglet building an app to simulate
fireworks. And I want to add special effects of persistence of vision. I do
not know how to do it, I just do it in my own way. Maybe you can tell me
how to do it. My problem is that I update the background
(glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT)) every 3, 5, 7 frames, it
works. If I update the background every 2,4,6,8 frames, it failed. why?
my code is like this
def on_draw(self):
glViewport(0, 0, window.width, window.height)
glMatrixMode(gl.GL_PROJECTION)
glLoadIdentity()
gluPerspective(90,window.width/window.height,0.05,1000)
glMatrixMode(gl.GL_MODELVIEW)
glLoadIdentity()
gluLookAt(0.0,0.0,4.0,
0.0,0.0,0.0,
0.0,1.0,0.0)
if self.frame % 5 == 1: # if change 5
to even number 4,6,8, it failed
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT)
full code can be found here
<https://github.com/xinmingzhang/fireworks/blob/master/fireworks.py>
And I am new to OpenGL, I also lost in setting these gl environment, like
gl.GL_PROJECTION, gl.GL_MODELVIEW etc. Sometimes I set the projection, and
I see nothing on screen. Is there any good suggestions?
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