Materials throwing errors.

[samuel rodriguez]

So when I try to run this small piece of code 

from vpython import *

ball = sphere(pos=vector(1,2,1), radius=0.5, make_trail=True, trail_type="points",

              interval=10, retain=50, material = earth)

I get the error

---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-5-e24e0b730fb2> in <module>()
      1 ball = sphere(pos=vector(1,2,1), radius=0.5, make_trail=True, trail_type="points",
----> 2               interval=10, retain=50, material = materials.earth)
      3 #ball.rotate(angle=pi/4.)

NameError: name 'materials' is not defined

I am running '7.1.3', 'jupyter'. I think it might have something to do with the version of vypthon that I am using but I am not sure.

Thank you for all of your help,

Best 

Samuel Rodriguez

[Bruce Sherwood]

"materials" was part of VPython 6 ("Classic VPython"). In VPython 7 there is a similar attribute, "texture". The documentation for VPython 7 is here:

     http://www.glowscript.org/docs/VPythonDocs/index.html

Or go to glowscript.org and click "Help".

Here is the documentation page dealing with textures:

     http://www.glowscript.org/docs/VPythonDocs/textures.html

Your particular program will run if you change "material=earth" to "texture=textures.earth". Otherwise your program is okay.

Bruce

[samuel rodriguez]

Thank you so much! That worked right away. I spent so long trying to figure out why it wasn't working. Is there an emmisive texture?

[Bruce Sherwood]

Here is the documentation page that describes all of the standard attributes, of which "emissive" is one:

http://www.glowscript.org/docs/VPythonDocs/cylinder.html

In addition to the documentation found at glowscript.org, note that at vpython.org there are links to a zip file of demo programs. You can also run these same demo programs simply by going to glowscript.org and clicking "Example programs".

Bruce