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CAD tip CAD tip # 8479:

Question CAD 
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Q - question

How to generate 3D surface with a mathematic expression?

A - answer AutoCAD 3D surfaces can be created also parametrically - generated automatically using a math expression (equation). For this you can use the free application CADstudio 3DPlot.

In your current DWG drawing, 3DPlot generates a 3D surface of the type polyface mesh by applying your custom defined expression, entered as [X,Y,Z] = f(U,V). So you can generate eny mathematic surfaces. The 3DPLOT command contains several sample objects.

To use your own math functions (after you load 3DPlot), you need to perform two steps:

  1. define your function;
  2. call the tool (3DPlot) to plot it.

For an example, a 3D surface defined by the expression Z = sin (2 * x * y) will need these two steps in the following form - enter the LISP commands in your AutoCAD command line:

  
(defun mySaddle (x y) (list x y (sin (* 2 x y))))  
(3DPlot mySaddle -1.0 1.0 0.1 -1.0 1.0 0.1)  

The first line defines your math expression to a LISP function "mySaddle" (must return a list of coordinates X Y Z). The second line then calls the plot engine for points in the interval (-1;1) in both directions, in a step of 0.1. The result will be a nice 3D "saddle".

Saddle

The top right image in the DWG format - see Boy surface.

See more information and download on CADstudio 3DPlot

ACAD
100% *  CAD 
20.2.2012    4567x  
Comments   Tell a friend
applies to: AutoCAD ·

See also:
Tip 11074:How to convert a 2D polyline to 3D or vice-versa?
Tip 11068:Unknown icon in an AutoCAD Civil 3D project.
Tip 11054:Difference volume (3D solid) between two TIN surfaces (sets of coordinates)
Tip 10938:The Publish property at View representations.
Tip 10926:Self-intersecting polylines and polylines with duplicate vertices.


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