{"id":3794,"date":"2025-06-28T13:10:52","date_gmt":"2025-06-28T13:10:52","guid":{"rendered":"https:\/\/help.cadomation.com\/spcad\/docs\/spcadhelp\/analysis\/offset-of-a-3d-polyline\/"},"modified":"2025-09-29T11:37:03","modified_gmt":"2025-09-29T11:37:03","slug":"offpl3","status":"publish","type":"docs","link":"https:\/\/help.cadomation.com\/spcad\/docs\/spcadhelp\/analysis\/offpl3\/","title":{"rendered":"Offset of a 3D Polyline"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">Overview<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:18px\">In standard CAD environments, the OFFSET command is widely used to create parallel copies of 2D entities like lines, arcs, and polylines. However, <strong>AutoCAD and other CAD software do not natively support offsetting 3D polylines<\/strong>, making it challenging for users working in 3D space to generate parallel features. This limitation poses a major hurdle in civil engineering, topographic modeling, and 3D design workflows where parallel alignments or elevation-based contours are needed.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:18px\">The <strong>Offset 3D Polyline<\/strong> tool in SPCAD bridges this gap. It allows users to <strong>create a spatially offset version<\/strong> of an existing 3D Polyline, preserving the elevation (Z-values) and geometry while offsetting the curve laterally in the XY plane.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\" style=\"font-size:18px\">This tool is essential in scenarios such as:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Firstly<\/strong>, creating parallel road or canal alignments from a baseline\u00a0<\/li>\n\n\n\n<li><strong>Secondly<\/strong>, designing shoulder lines, ditches, or drainage lines alongside surveyed centerlines\u00a0<\/li>\n\n\n\n<li><strong>Additionally<\/strong>, generating contours or construction boundaries offset from original 3D geometry\u00a0<\/li>\n\n\n\n<li><strong>Lastly<\/strong>, modeling levees, berms, or offset utility paths in 3D terrain<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img decoding=\"async\" width=\"393\" height=\"367\" src=\"https:\/\/help.cadomation.com\/spcad\/wp-content\/uploads\/2025\/06\/image-9.png\" alt=\"3D Polyline Offset\u00a0\" class=\"wp-image-3809\" srcset=\"https:\/\/help.cadomation.com\/spcad\/wp-content\/uploads\/2025\/06\/image-9.png 393w, https:\/\/help.cadomation.com\/spcad\/wp-content\/uploads\/2025\/06\/image-9-300x280.png 300w\" sizes=\"(max-width: 393px) 100vw, 393px\" \/><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\"><strong>Workflow Steps<\/strong>&nbsp;<\/h2>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>Launch the Tool<\/strong>&nbsp;<br>Start the <strong>3D Polyline Offset<\/strong> command from the SPCAD Ribbon (Analysis Panel) or type the command <strong>OFFPL3_SP<\/strong>.&nbsp;<\/li>\n<\/ol>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>Select the Source 3D Polyline<\/strong>&nbsp;<br>Click on the 3D Polyline you want to offset.&nbsp;<\/li>\n<\/ol>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>Enter the Offset Distance<\/strong>&nbsp;<br>Type in a positive or negative value.&nbsp;\n<ul class=\"wp-block-list\">\n<li>Positive values offset to the right (based on polyline direction)&nbsp;<\/li>\n\n\n\n<li>Negative values offset to the left&nbsp;<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\">\n<li><strong>Result<\/strong>&nbsp;<br>A new 3D Polyline is created <strong>parallel in plan (XY)<\/strong> but with <strong>Z-values restored from the original 3D Polyline.<\/strong>&nbsp;<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Tips<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Works on open and closed 3D polylines.&nbsp;<\/li>\n\n\n\n<li>For curves, the tool segments based on polyline approximation (treats arc segments as linear).&nbsp;<\/li>\n\n\n\n<li>Be cautious with complex geometries; sharp corners or overlapping geometries may affect offset accuracy.\u00a0<\/li>\n\n\n\n<li>The tool places the resulting polyline on the current layer for visibility control.<\/li>\n<\/ul>\n","protected":false},"featured_media":0,"parent":1450,"menu_order":16,"comment_status":"open","ping_status":"closed","template":"","meta":{"_kadence_starter_templates_imported_post":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"doc_tag":[],"class_list":["post-3794","docs","type-docs","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Offset 3D Polyline in AutoCAD with SPCAD<\/title>\n<meta name=\"description\" content=\"Offset 3D Polyline in AutoCAD with SPCAD. 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