Re: [Matplotlib-users] color in plot3d

[Pablo A. <pab...@ua...>]

Thanks again!

El 17/06/10 02:03, Mike Alger escribió:
>
> Pablo,
>
>  
>
> I found the example on the svn
>   http://matplotlib.svn.sourceforge.net/viewvc/matplotlib/trunk/matplotlib/examples/mplot3d/surface3d_demo3.py?view=log
> it will demonstrate the face colour thing  but personally I found
> getting the rgb tuple data into an array a bit too complicated for my
> needs.
>
>  
>
> Regarding that little SNAFU about the matrix size, I was half asleep
> and in a rush when I wrote the reply to your email, so I knew if I
> made a mistake it was in the interpretation there :D
>
> A slice,  reshape function  may be more efficient/ easier to read but
> I took the loop structure right from the plot surface command  to make
> sure it was done exactly the same way as the 3d surface. It may be
> interesting to see which is more efficient computationally and  see if
> there is an improvement to be made in the plot surface command
>
>  
>
>  
>
> *From:* Pablo Angulo [mailto:pab...@ua...]
> *Sent:* June-16-10 9:07 AM
> *To:* Mike Alger
> *Cc:* mat...@li...
> *Subject:* Re: [Matplotlib-users] color in plot3d
>
>  
>
> El 15/06/10 01:22, Mike Alger escribió:
>
> The way that color keyword is set up,  it is dedsigned to take a color
> word or  rgba tuple , (Reinier will know this better than me), however
> if you want to just assign colors based on a colour map you can take
> you color array  and reshape  the same way the plot surface command
> does  then  use surf.set_array()
>
>
> If I understand you correctly, you mean there is a way to use directly
> a map from two or three spatial coordinates into the three or four
> components of the color space?
>
> That's interesting. It might be limiting that this map has to factor
> as the composition of an scalar map and a color map, even for 2d plots.
>
>
>
>  here is a snippet of the code I use to do this I am pretty sure it
> won’t run the way it is right now but the idea is buried in there
>
> Thanks, I got the idea!
>
>  
>
> note that regmap xyz and costmapz are all the same size and are nxm
> matrices costmapout is a 2x(m.n) if i can do the math correctly
>
>
> One comment: from your code it seems that costmapout is a 1D array of
> lenght roughly equal (m*n)/scale**2 with the data coming from
> costmapz. Why don't you use a slice followed by a reshape command?
>
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