3D colorplot as a function of radius

Hello,

I have a 3D surface, displayed with surf function. All the colormaps are a function of Z value, meaning that in XY plane the color does not change. I need to color the surface as a function of the distance from the origin, meaning the color on the same radius does not change, no matter what the direction from the origin: x, y or z. Any ideas how to do this?

Thanks!

Answer 1

[Image Analyst]

Not sure that's possible. You could do it if you made it an actual color image instead of a 2.5-D rendering of the image as a surface but you'd just have a 2-D color image, not s surface looking rendering.

[E]

Thanks,

That would be strange, because matlab connects somehow the values of Z to the color, if I knew how, I could change the color any way I want... It may be complicated, but I believe it is possible

Thank though for the try!

[Image Analyst]

It does, but you didn't want that. You wanted (I think) to ignore z and color the grid as a function of sqrt(x^2+y^2) which is the distance of the point from the origin. You can make up a new Z which is sqrt(x^2+y^2) but then it won't look anything like your original z.

Answer 2

[Luke Albers]

Have a look at this link: https://www.mathworks.com/help/matlab/creating_plots/how-surface-plot-data-relates-to-a-colormap.html

Simply define a colormap variable equal to the radius C=(sqrt(x.^2+y.^2+z.^2) and include it in the plot command: surf(x,y,z,C)