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Multi variable functions

Another problem I found when trying to export to STL and 3D print was that the functions ended up being zero-thickness objects so they do not appeared in the STL files. For example the function that you see below does not appears in the STL export.

f(x,y)=x^2+y

f(x,y)=x^2+y
Image

Solution:

This was also solved with a little trick: We are going to create a simple parametric curve and once again with the surface command we will be able to create a surface that appears in the STL export. We are going to treat our function as parametric curve using the parametrization: and the surface command: Surface(r , t, f(r,t) , r , -2 , 2 , t , -2 , 2) Getting the following STL export:
Image

You can try this in here. Remember to export to STL.