Re: [Matplotlib-users] plotting oriented (two sided) surfaces

[László O. <oro...@gm...>]

actually this makes a lot of sense..
thanks for the pointers.. I shall keep on digging..

laszlo


On 14 April 2014 18:36, Benjamin Root <ben...@ou...> wrote:

> I think the closest you are going to get is with using the "shade=True"
> kwarg in plot_surface(). This is the only way that mplot3d utilizes normal
> vectors, and that really only makes one side look "duller" than the other.
>
> Since you mentioned wanting to eventually display self-intersecting
> surfaces, I would probably suggest trying out Mayavi2 or glumpy instead as
> those are more geared towards 3d visualization than mplot3d is. mplot3d has
> significant issues with rendering intersecting polygons because it isn't a
> true 3d plotting system (it just computes projections of whole polygons and
> uses a single z value to represent where in the layering the polygon should
> go).
>
> Cheers!
> Ben Root
>
>
>
> On Mon, Apr 14, 2014 at 9:34 AM, László Oroszlány <oro...@gm...>wrote:
>
>> well I sort of wanted to avoid doing two spheres..  later on I wanted to
>> do more complicated surfaces.. and it can get a bit messy.. It is not
>> straight forward to generate the two parallel surfaces in general..  to be
>> honest the problematic case would be when i want to display
>> selfintersecting but still orientable surfaces (NOT Klein bottles or
>> Moebius strips)
>> cheers anyway for the quick response
>>
>> laszlo
>>
>>
>>
>> On 14 April 2014 15:21, Shahar Shani Kadmiel <ka...@po...>wrote:
>>
>>> Hi, I am not aware of such an option (AFAIK) but my suggestion would be
>>> to make two spheres with very small radii difference, paint the slightly
>>> smaller one (inside) blue and the other one red.
>>> Just a quick fix for the problem at hand. I'm sure the experts here will
>>> have plenty of very in depth solutions.
>>>
>>> Shahar
>>> —
>>> Sent from Mailbox <https://www.dropbox.com/mailbox> for iPhone
>>>
>>>
>>> On Mon, Apr 14, 2014 at 1:48 PM, László Oroszlány <oro...@gm...>wrote:
>>>
>>>> Dear matplotlib users,
>>>>
>>>> I recently started using matplotlib to make a couple of educational
>>>> presentations.
>>>> For most of my problems I found the manual and the examples on the web
>>>> enough,
>>>> however I ran into a bit of an issue regarding plotting some surfaces.
>>>> My main problem has to do with plotting orientable (or two sided
>>>> surfaces).
>>>> Simply put I want to plot a sphere cut in half and make the inside red
>>>> and the outside blue.
>>>> I was wondering if there exist some flag or option in the already
>>>> available  plotting functions to do this?
>>>>
>>>> Cheers
>>>>
>>>> laszlo
>>>>
>>>>
>>>
>>
>>
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