Re: [Matplotlib-users] matplotlib 3D: interpolated shading

[Holger B. <hol...@sa...>]

Ben,

I would be very happy to have this functionality. I think this would
also make the 3D plots in the examples that matplot provides look a
good deal nicer.

Let me know if you have any updates on this.

-Holger

On Mon, Oct 3, 2011 at 21:18, Benjamin Root <ben...@ou...> wrote:
>
>
> On Fri, Sep 30, 2011 at 11:33 AM, Holger Brandsmeier
> <hol...@sa...> wrote:
>>
>> Ben,
>>
>> On Fri, Sep 30, 2011 at 17:06, Benjamin Root <ben...@ou...> wrote:
>> > What values for rstride and cstride are you using?  By default,
>> > plot_surface() will sample every 10th point of the data array (for
>> > performance reasons).  Also, color interpoltion can be turned on by
>> > setting
>> > shade to True.
>>
>> I beleive I start to understand the underlying logic. If no color map
>> is set and shading and antialiazing is set,  then indeed the surface
>> is nicely and smoothly displayed. When I provide a color map, then I
>> seem to be able to assign one color for the whole polygon. I also find
>> something like that in the code.
>>
>> In my case I want the z-coordinate to determine the color. I want to
>> use a colormap like jet and no transparency. If I don't use the
>> colormap argument, then I get shading, however everything is blue with
>> shading depending on a lightsource.I don't really need a lightsource,
>> but I would like non-constant colors per polygon.
>>
>
> Yes, you have the logic correct (and probably better explained than I could
> have done).  This actually was an issue raised a couple of months ago in a
> bit of a different context, but the solution wasn't entirely clear at that
> point.  However, looking at the code again (remember, I didn't write it
> originally, and it had next to no comments), I think I see a fairly simple
> solution.  If I allow for the user to specify a light source of None, then I
> could feed the data through a different function to "shade" the surface.  I
> will look into doing that, but it won't make it into the v1.1.0 release
> (slated for tomorrow).
>
> Cheers!
> Ben Root
>
>



-- 
Holger Brandsmeier, SAM, ETH Zürich
http://www.sam.math.ethz.ch/people/bholger