procedure Set3DView(dataName : Str255; phi, theta, ratio, xScale, yScale, zScale : real);

Sets the 3D view for 3D plots.  Phi, theta, and ratio controls the tip, rotation, and perspective of the plot.  The xScale, yScale, and zScale control the size ratio of the 3 sides of the plot cube.

Also see:  Set3DLight  Set3DFill