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Help with 3DPlot
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joefromhersey View Drop Down
Newbie
Newbie


Joined: 22.Jun.2012
Location: United States
Using: Inventor2012
Status: Offline
Points: 1 		Post Options Post Options   Thanks (0) Thanks(0)   Quote joefromhersey Quote  Post ReplyReply Direct Link To This Post Topic: Help with 3DPlot
    Posted: 24.Jun.2012 at 02:37
Hi I am pretty new to AutoCad and need some help plotting 3D surfaces from mathematical functions. I downloaded the 3DPlot utility and followed the instructions from this site: http://www.cadstudio.cz/en/apps/3dplot/.

I defined a shape myFunc using:
(defun myFunc (x y) (list x y (cos(x)+cos(y))))

However when I try to plot using:
(3DPlot myFunc -1.0 1.0 0.1 -1.0 1.0 0.1)

I get this error:
error: bad function: -1.0

What am I doing wrong? Also would it be possible for me to get repeating units of the function cos(x)+cos(y)?
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Vladimir Michl View Drop Down
Moderator Group
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CAD Studio a.s.

Joined: 26.Jul.2007
Location: Czech Republic
Using: Autodesk software
Status: Offline
Points: 1379 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Vladimir Michl Quote  Post ReplyReply Direct Link To This Post Posted: 17.Jul.2012 at 09:36
Hi, your function definition is not properly formated in AutoLISP syntax. Assuming you want to draw Z = cos(x) + sin(x), the proper syntax is:
 
(defun myFunc (x y) (list x y (+ (cos x) (cos y))))
 
This will draw a part of a 3D sphere.
Vladimir Michl (moderator)
CAD Studio - www.cadstudio.cz
(Autodesk reseller and developer)
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Related CAD tips:
Tip 8903:Draw normals of 3DFaces in AutoCAD DWG.
Tip 8479:How to generate 3D surface with a mathematic expression?


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