Re: [Visualpython-users] rate() function

[Bruce S. <bas...@un...>]

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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