#### 10.11.8 Dsurface

• Dsurface( <f(u,v)> [, uMin+i*uMax, vMin+i*vMax, uNbLg+i*vNbLg, (smooth 0/1)+i*contrast] )
• Description: that macro draw a surface parametrized by <f(u,v)> where f is a function of two real variables u and v, with values in the space. The second parameter represent the interval of the variable $u$ ($\left[-5,5\right]$ by default), The third parameter represents the interval of the variable $v$ ($\left[-5;5\right]$ by default), the fourth parameter represents, in the form of a complex, the lines number for $u$ and the lines number for $v$ ($25$ lines by default). This is the macro DrawFacet that is doing the rendering with the color corresponding to the variable FillColor with the given <contrast> ($1$ by default) and a smoothing if <smooth> is $1$ ($0$ by default).