Question: How do I draw a surface and make color vary with R ?

Hello everyone !

 

First of all, excuse my English if it's difficult to read, I'm french.

 

I'd like to draw a surface/shape in 3D in spherical and I used plot3d with coords=spherical to do so. But I'd like to color on the picture to change when R(theta,phi) changes. I could visualize how R is changing and where it is the same. But I have no idea how to do so...

 

I can't put the picture here, the formula is too long...

 

Anyone has an idea ?

Thanks

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