Re: [Visualpython-users] speed

[Tim S. (25121) <tk...@mi...>]

Hmm. Would I benefit from writing the application purely in c++ (not my
preferred option)?
I'm treading a line between speed and flexibility of pumping out various
models, and speed of interpreting the model itself. If the model is
frighteningly slow to interact with then I'm sunk, but if it takes me
too long to produce a new model I'm also sunk.



-----Original Message-----
From: Bruce Sherwood [mailto:Bru...@nc...] 
Sent: Tuesday, 17 November 2009 11:49 AM
To: Tim Smith (25121)
Cc: vis...@li...
Subject: Re: [Visualpython-users] speed

I would say that your measurements clearly show that VPython is
unsuitable for 
your task. The basic problem is that VPython is designed to facilitate
the 
creation of navigable animations, which means that rendering must be
done within 
a fraction of a second to permit responsive navigation with the mouse.
Since 
this rendering is being done in C++, not in Python (though the Python
objects 
must be referenced from the C++ code), it seems unlikely to me that some
other 
engine would give you the interactivity you're looking for, but maybe
someone 
reading this list can recommend an application that can do what you
need.

The only thing that can reduce the render time would seem to be to make
the 
spheres extremely small, so that there is little to render.

Sorry!

Bruce Sherwood

Tim Smith (25121) wrote:
> Something I've noticed with vpython is speed doesn't seem to scale up.
> In my model I found 1000 points has a render time of 17, 10,000 points
> has a render time of 170, and 50,000 point has a render time of 445.
> Once I go over the 10,000 point mark performance starts to go down
> exponentially.
> What I'm wondering, is I'll potentially have to render 1,000,000
points
> for one of my projects, is vpython unsuitable for my task and is there
a
> faster python 3d library out there? I've been really impressed with
how
> fast vpython has enabled me to produce from very detailed models, how
> ever working with such slow objects is going to drive me a little
batty
> eventually.
>

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