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### Mathematical surface

The user can defines surfaces with equation of type z = f(x, y).
The surface definition is done is the window shown above. The possible functions in the equation are :

- '+' : add
- '-' : substract
- '*' : multiply
- '/' : divide
- '^' : power
- 'sqrt' : square root
- 'sin' : sinus, in degree
- 'cos' : cosinus
- 'tan' : tangent
- 'asin' : arcsinus
- 'acos' : arccosinus
- 'atan' : arctangent
- 'log' : logarithm, base 10
- 'ln' : logarithm, base e
- 'ceil' : round by
- 'floor' : round by default
- 'round' : round to nearest integer
- 'abs' : absolute value
- 'mod' : modulo
- '=' : equality
- '!=' : difference
- '<' : lower
- '>' : greater
- '>=' : lower or equal
- '<=' : greater or equal
- '|' : logical or
- '&' : logical and
- '!' : logical not
- constant : 'pi', 'e'.

The result of the equation z = 1 / (x^2 + y^2 + 0.01) is :

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