[Visualpython-users] critical error report

[symion <sy...@pr...>]

I have been testing Vpython, looking for boundaries.

IDLE just through up an error.

I was zooming in to a simple scene, looking for limits
Zooming in to destruction.

Here is the code snippet that was running, although I have run other 
bits of code and found the same result.

r=1.49e+15
cur=[(0,0,0),(r,0,0)]
p=points(pos=cur,color=(1,1,1))

Now zoom in and in, and in like a crazy man, looking for that boundary.

oops!

VPython ***CRITICAL ERROR***: ..\src\core\display_kernel.cpp:909: 
cvisual::display_kernel::render_scene: OpenGL error: 
..\src\core\display_kernel.cpp:548 invalid value, aborting.

Also, when zooming out and out...

VPython ***CRITICAL ERROR***: ..\src\core\display_kernel.cpp:535: 
cvisual::display_kernel::world_to_view_transform: VPython degenerate 
projection: 1.#INF 1.#INF 0.0500417 0.0315297

Yep, found the other one!

Are the problems reported related to the apparent lack of any clear 
range/scale boundaries?

Which leads me into the next question.

I am having problems with scene.range. I expect it to be connected to 
user zoom, so I can measure user input, just like scene.forward method.

This is what I have found.
If I run any program without setting scene.range then a default value 
seems to be used and the program runs OK, but if I then try to read the 
current scene.range, IDLE displays the following warning.

Traceback (most recent call last):
  File "<pyshell#1>", line 1, in <module>
    scene.range
RuntimeError: Reading .scale and .range is not supported when autoscale 
is enabled.

Now if I change the program so that scene.range is set to some arbitrary 
value and then run it, then the program runs OK, no problems, and 
reading scene.range returns the exact value I gave it! (which is kind of 
redundant)

But when as a user I zoom in or out, and then read scene.range, nothing 
happens! the value is as I had previously set, no user actions are 
recorded by scene.range!

if scene.userzoom and scene.range are not connected, then how can I (or 
my program) determine the current user zoom value?

Symion