Re: [Visualpython-users] rate() function

[Gary S. <st...@nm...>]

For what it's worth, this _only_ happens when the computer can't keep up
(like, when drawing 500 background objects). When the computer is able to
keep up, a rate(n) gives an actual framerate of n (or very slightly less,
thanks to random background processes.

> Many thanks for offering this analysis tool. It sure looks like something 
> is very wrong with the rate machinery. A quick look at the Visual code 
> indicates that rate ought to work fine, but it most assuredly isn't working 
> fine, as you show conclusively.
> 
> Bruce Sherwood
> 
> At 11:35 AM 02/06/21 -0400, Gary Strangman wrote:
> 
> >Hi all,
> >
> >This might be a bit off-topic--perhaps hardware related(?)--but does
> >anyone know exactly what happens when you pick value of N such that your
> >computer can't handle a given "rate(N)" visualpython statement? Do frames
> >get dropped? Or is it dependent on one's graphics card, or screen refresh
> >rates, or openGL implementation? Using the program below, my _actual_
> >framerate increases as a stair-stepped function of the _specified_
> >framerate. What I find odd is that the _actual_ framerate does keep on
> >increasing. That is, rate(50) doesn't give me a 50Hz frame rate, but
> >(according to my loop anyway) using rate(100) gives me a better than 50Hz
> >frame rate. I would think that the actual framerate should increase
> >linearly to the point where one's computer is maxed out, and then plateau
> >indefinitely. Apparently that's naive. Any ideas? I've tested this on both
> >a couple machines (though both are portables with, of course, LCD
> >monitors).
> >
> >Thanks in advance for any guesses (or better yet, answers) ...
> >
> >Gary
> >strang-@at@-nmr.mgh.harvard.edu
> >
> >--- cut here ---
> >
> >from visual import *
> >import time, sys, whrandom
> >
> >scene.title = "Speed test"
> ># Create 2 frames
> >fworld = frame(pos=(0,0,0))
> >ftarget = frame(frame=fworld,pos=(0,0,0))
> >ftarget.pos = (0,0,0)
> >fworld.pos = (0,0,10)
> >
> ># Draw some main objects
> >body = cylinder(frame=ftarget, pos=(0,0,0), axis=(0,0,0.35), radius=1, 
> >color=(0,0,1),visible=1)
> >pin = cylinder(frame=ftarget, pos=(0,1,0), axis=(0,1,0), radius=1, 
> >color=(1,1,1),visible=1)
> >pinball = sphere(frame=ftarget, pos=(0,-1,0), radius=1, 
> >color=(1,1,0),visible=1)
> >topbox = box(frame=ftarget, pos=(0,0.34,0.20), axis=(0,1,0), 
> >length=0.2,width=0.1,height=0.1, color=(1,0,0),visible=1)
> >horizon = cylinder(frame=ftarget, pos=(-5,2,0), axis=(10,0,0), radius=1, 
> >color=(0,1,0),visible=1)
> >
> >xINC = 0
> >yINC = 0.001
> >zINC = 0.003
> >rollINC = 0
> >pitchINC = 0
> >yawINC = 0
> >scene.autoscale = 0
> >NUM_DOTS    = 500
> >RADIUS  = 120
> >rad = 0.4
> ># now draw background objects
> >for i in range(0, NUM_DOTS):
> >     x = whrandom.random() - 0.5
> >     y = whrandom.random() - 0.5
> >     z = whrandom.random() - 0.5
> >     length = math.sqrt(x*x + y*y + z*z)
> >     x = x / length * RADIUS
> >     y = y / length * RADIUS + 1.8
> >     z = z / length * RADIUS
> >     sphere(pos=(x,y,z),radius=rad)
> >
> >frameratelist = []
> >for framerate in range(10,250,1):
> >     framecount = 0
> >     starttime = time.clock()
> >     while framecount<5*framerate:  # integrate over, theoretically, 5sec
> >         rate(framerate)
> >         framecount += 1
> >         fworld.pos.x -= xINC
> >         fworld.pos.y -= yINC
> >         fworld.pos.z = framecount*zINC
> >
> >         # Rotate "CAMERA" (actually, move whole _world_ around camera)
> >         fworld.rotate(angle=pitchINC, axis=(1,0,0), 
> > origin=scene.mouse.camera)
> >         fworld.rotate(angle=yawINC, axis=(0,1,0), origin=scene.mouse.camera)
> >         fworld.rotate(angle=rollINC, axis=(0,0,1), origin=scene.mouse.camera)
> >     endtime = time.clock()
> >     print "Rate(%i): %i frames in %2.2f sec = %2.2f frames/sec" % 
> > (framerate, framecount, (endtime-starttime), framecount/(endtime-starttime))
> >     frameratelist.append((framerate, framecount, (endtime-starttime), 
> > framecount/(endtime-starttime)))
> >
> >
> >
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