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<Bold>Function Syntax: OFFSET3D</Bold>
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<Hyperlink>https://www.cadtutor.net/forum/topic/221-how-do-i-offset-3d-polyline/page/2/</Hyperlink>
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<Hyperlink>http://www.black-cad.de/starten.htm</Hyperlink>
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<Hyperlink>https://www.ant-ares.de/</Hyperlink>
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Description: This function will ask the user to select a 3d-polyline. This 3d-polyline will be projected on the plane z=0. There will be done the offset- command in 2d and then the offsetted 3d-polyline will be constructed from the 2d- and 3d coordinates. 
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<Bold>Description</Bold><LineBreak/>
This AutoLISP program performs a 3D Offset operation on an existing <Span Foreground="DarkRed">3D Polyline</Span>.
It temporarily projects the 3D Polyline into a 2D plane, applies an offset distance entered by the user, and then rebuilds a new offset 3D Polyline that follows the original’s elevation pattern. <LineBreak/>

<Bold>Main command</Bold><LineBreak/>
<Span Foreground="DarkRed">OFFSET3D</Span> — creates a 3D offset of a selected 3D Polyline. <LineBreak/>

<Bold>Sub-function</Bold><LineBreak/>
<Span Foreground="DarkRed">polypt</Span> — extracts the list of vertex points (XYZ coordinates) from a Polyline entity. <LineBreak/>

<Bold>What the user does</Bold><LineBreak/>
• Run <Span Foreground="DarkRed">OFFSET3D</Span>.<LineBreak/>
• Select a 3D Polyline when prompted. <LineBreak/>
• Enter the desired offset distance using the keyboard. <LineBreak/>
• Wait while the program creates a new 3D offset version of the polyline. <LineBreak/>

<Bold>Main steps performed</Bold><LineBreak/>
• Saves current AutoCAD system variables:
<Span Foreground="DarkRed">OSMODE</Span>, <Span Foreground="DarkRed">PLINETYPE</Span>, and <Span Foreground="DarkRed">VIEWDIR</Span>. <LineBreak/>
• Disables object snaps and sets PLINETYPE to 0 to work in classic polyline mode. <LineBreak/>
• Sets the UCS to the World Coordinate System and switches the view to a top (plan) view for accurate projection. <LineBreak/>
• Uses the helper function <Span Foreground="DarkRed">(polypt)</Span> to extract all vertex coordinates from the selected polyline. <LineBreak/>
• Creates a temporary 2D polyline using the (x, y) coordinates from the original 3D polyline. <LineBreak/>
• Prompts the user for the offset distance: <Span Foreground="DarkRed">(getreal "\ndistance by keyboard: ")</Span>. <LineBreak/>
• Executes the standard AutoCAD <Span Foreground="DarkRed">OFFSET</Span> command to offset the temporary 2D polyline. <LineBreak/>
• Extracts vertex points from the new offset 2D polyline using <Span Foreground="DarkRed">(polypt)</Span> again. <LineBreak/>
• Builds a new <Span Foreground="DarkRed">3D Polyline</Span> by combining the original Z-values with the offset XY-coordinates. <LineBreak/>
• Erases temporary 2D geometry used during the process. <LineBreak/>
• Restores previous AutoCAD settings for OSMODE, PLINETYPE, and view direction. <LineBreak/>

<Bold>Result</Bold><LineBreak/>
A new <Span Foreground="DarkRed">3D Polyline</Span> is created, offset from the original by the specified distance, while retaining the vertical (Z) profile of the source polyline. <LineBreak/>

<Bold>Key functionalities</Bold><LineBreak/>
• Generates a 3D offset copy of an existing 3D Polyline. <LineBreak/>
• Maintains elevation values of the original geometry. <LineBreak/>
• Automatically handles conversion between 3D and 2D projections. <LineBreak/>
• Uses the <Span Foreground="DarkRed">polypt</Span> function to extract and rebuild vertex lists. <LineBreak/>
• Restores system settings to ensure safe and reversible execution. <LineBreak/>
• Accepts custom offset distances entered manually. <LineBreak/>
• Removes intermediate temporary polylines automatically. <LineBreak/>

<Bold>Helper function details</Bold><LineBreak/>
<Span Foreground="DarkRed">polypt(ss)</Span> — Checks if the selected entity is a <Span Foreground="DarkRed">POLYLINE</Span> and builds a list of all its vertex coordinates.
If the selected object is not a polyline, it displays:
<Span Foreground="Red">"this is not a POLYLINE !"</Span> and exits the routine. <LineBreak/>

<Bold>Important implementation notes</Bold><LineBreak/>
• The routine works only with 3D Polylines (<Span Foreground="DarkRed">POLYLINE</Span> entities of 3D type). <LineBreak/>
• The offset distance must be input manually; no dynamic preview is provided. <LineBreak/>
• The elevation data for the new polyline is inherited from the original 3D geometry. <LineBreak/>
• The function temporarily redefines the view to ensure correct offset direction. <LineBreak/>
• All temporary objects created during the operation are automatically erased at the end. <LineBreak/>
• Recommended to save your drawing before running, as complex 3D offsets can create geometry variations. <LineBreak/>

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