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<Bold>Function Syntax: 3DF_to_3DPoint</Bold>
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<Hyperlink>https://www.cadforum.cz/en/download.asp?fileID=967</Hyperlink>
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<Bold>Description</Bold><LineBreak/>
This AutoLISP command converts each selected 3DFACE into four AutoCAD POINT entities placed at the face’s vertex coordinates, preserving the original 3DFACE by default. It wraps the work in a single UNDO group and restores CMDECHO afterward. <LineBreak/>

<Bold>Command name</Bold><LineBreak/>
<Span Foreground="DarkRed">3DF_to_3DPoint</Span> (type this at the command line) <LineBreak/>

<Bold>What the user does</Bold><LineBreak/>
• Run <Span Foreground="DarkRed">3DF_to_3DPoint</Span> and select one or more 3DFACE objects when prompted. <LineBreak/>

<Bold>Main steps performed</Bold><LineBreak/>
• Temporarily disables command echo: <Span Foreground="DarkRed">(setvar "CMDECHO" 0)</Span>. <LineBreak/>
• Starts an UNDO group: <Span Foreground="DarkRed">(command "_UNDO" "_G")</Span>. <LineBreak/>
• Prompts for a selection set filtered to 3DFACE: <Span Foreground="DarkRed">(ssget '((0 . "3DFACE")))</Span>. <LineBreak/>
• For each 3DFACE, extracts its four vertex points using group codes <Span Foreground="DarkRed">10</Span>, <Span Foreground="DarkRed">11</Span>, <Span Foreground="DarkRed">12</Span>, and <Span Foreground="DarkRed">13</Span>. <LineBreak/>
• Places a POINT at each vertex: <Span Foreground="DarkRed">(command "_point" pt1)</Span>, <Span Foreground="DarkRed">pt2</Span>, <Span Foreground="DarkRed">pt3</Span>, <Span Foreground="DarkRed">pt4</Span>. <LineBreak/>
• Optionally you can delete the original 3DFACE by uncommenting <Span Foreground="Red">(entdel hnd)</Span>. <LineBreak/>
• Optionally you can draw a closed 3D polyline around the vertices by uncommenting <Span Foreground="Red">(command "_3dpoly" pt1 pt2 pt3 pt4 "_C")</Span>. <LineBreak/>
• Prints a small completion note: <Span Foreground="DarkRed">", Done."</Span>. <LineBreak/>
• Ends the UNDO group: <Span Foreground="DarkRed">(command "_UNDO" "_E")</Span>. <LineBreak/>
• Restores the original CMDECHO value and exits quietly. <LineBreak/>

<Bold>Result</Bold><LineBreak/>
You will see POINT entities at each corner of every selected 3DFACE while the original faces remain unchanged unless you enable deletion, and all actions are grouped for a single undo. <LineBreak/>

<Bold>Key functionalities</Bold><LineBreak/>
• Create POINT markers at the four vertices of each selected 3DFACE. <LineBreak/>
• Keep or remove the source 3DFACE based on whether <Span Foreground="Red">(entdel hnd)</Span> is uncommented. <LineBreak/>
• Optionally generate a closed 3D polyline outline of the face using <Span Foreground="Red">_3dpoly</Span>. <LineBreak/>
• Batch process multiple 3DFACE objects in one run. <LineBreak/>
• Safe operation via UNDO grouping and restoration of system state. <LineBreak/>

<Bold>Important implementation notes</Bold><LineBreak/>
• Selection filter is restricted to 3DFACE only: <Span Foreground="DarkRed">(0 . "3DFACE")</Span>. <LineBreak/>
• Vertex extraction relies on standard DXF group codes: <Span Foreground="DarkRed">10</Span>, <Span Foreground="DarkRed">11</Span>, <Span Foreground="DarkRed">12</Span>, <Span Foreground="DarkRed">13</Span>. <LineBreak/>
• POINT display depends on your PDMODE and PDSIZE settings. <LineBreak/>
• The optional lines are commented; remove the leading semicolons to activate them. <LineBreak/>
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