[Python Wpg] Cannot figure out this ZeroDivisionError exception

[Stuart Williams]

I briefly looked through your code, and the print of scale + movex makes me
wonder if you're assuming different operator precedence than Python gives
you:

  nx = (x[n]+xrotoffset+camx)/nz/scale+movex

is interpreted as (formatted to match PEP8):

  nx = (((x[n] + xrotoffset + camx) / nz) / scale) + movex

I suspect scale is zero, even if scale+movex is not.

camz starts at zero, and if line 68 execute then scale becomes zero.

The other thing I noticed is your code has the loop over 8 values later in
the loop than the code that you're following.

Perhaps that will help.

Stuart.

On Thu, Mar 10, 2011 at 4:33 PM, Kevin Veroneau <kveroneau at gmail.com> wrote:

> Hello,
>
>   I am in the process of learning the basics of 3D math and programming,
> and thought using Python and Pygame would be a good choice to prototype in.
> The 2D example works great, the isometric 3D example also works.  But in the
> 3rd example, when I press Space to enter into full 3D, it uses a flow
> control statement to change a calculation.  Even though the calculation is
> very similar in both isometric and full 3D, it just does not work and I am
> very confused why.
>
>   You can view the source code online in my public Subversion Repository:
> http://django.kveroneau.info/svn/node1/python/pygame/3danim2.py/cat
>
>   I am following the tutorial step-by-step on this website:
> http://skytopia.com/project/cube/cube.html
>
>   That website explains 3D using pseudo-code, the author made it resemble
> BASIC-like syntax for clarity.  As I read through the tutorial, I coded it
> in Python, and thus is why there is three python files, one for each phase
> of the example.
>
>   I thought I would ask here, as I noticed many of you on this mailing list
> using Python for mathematical purposes, and this exception is related to a
> math operation in a calculation.  This is my first time going in depth with
> 3D programming and how the math behind it works.  I would of course move to
> OpenGL once I understand the fundamentals.
>
>   On the topic of OpenGL, which OpenGL Python library would you recommend
> someone who is just diving into GL.  I feel my Python skills are pretty
> strong at this point.  I understand that Blender can be scripted using
> Python, would this be a good place to start or should I use a stand-alone
> python module?
>
> Thanks,
>   Kevin Veroneau
>
>
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