{"id":4859,"date":"2026-01-16T08:22:31","date_gmt":"2026-01-16T08:22:31","guid":{"rendered":"https:\/\/help.cadomation.com\/spcad\/?post_type=docs&#038;p=4859"},"modified":"2026-01-27T05:48:22","modified_gmt":"2026-01-27T05:48:22","slug":"erodehole","status":"publish","type":"docs","link":"https:\/\/help.cadomation.com\/spcad\/docs\/spcadhelp\/tin-manager\/confine\/erodehole\/","title":{"rendered":"Erode Hole"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\"><strong>Overview<\/strong>&nbsp;<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Erode Hole removes (excavates) a portion of an existing TIN Surface using a closed polygon boundary. <strong>First<\/strong>, the tool identifies the defined boundary and rebuilds only the affected portion of the triangulation. <strong>As a result<\/strong>, a new TIN Surface is created as output, <strong>while<\/strong> the original surface remains unchanged.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Therefore<\/strong>, this tool is especially useful for modeling scenarios such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Excavation pits or borrow areas<\/strong>, where material is intentionally removed<\/li>\n\n\n\n<li><strong>Ponds and basins<\/strong>, requiring clean, well-defined depressions<\/li>\n\n\n\n<li><strong>Removals for structures or voids<\/strong>, such as foundations or underground spaces<\/li>\n\n\n\n<li><strong>Cut-outs<\/strong>, where the surface should no longer exist and must transition cleanly to the surrounding terrain<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Requirements<\/strong>&nbsp;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Before running the tool, ensure:&nbsp;<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>A TIN Surface is selected in the TIN Surface Manager<\/strong>&nbsp;\n<ul class=\"wp-block-list\">\n<li>The selected surface will be treated as the&nbsp;<strong>input surface<\/strong>.&nbsp;<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>You have a valid boundary polygon:\u00a0\n<ul class=\"wp-block-list\">\n<li>A\u00a0<strong>Closed Polyline<\/strong>\u00a0(recommended)\u00a0<\/li>\n\n\n\n<li>Or you can choose the\u00a0option\u00a0to\u00a0<strong>Draw Polygon<\/strong>\u00a0when prompted\u00a0<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\"><\/ol>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\"><\/ol>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\"><\/ol>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Workflow Summary<\/strong>&nbsp;<\/h2>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Select a TIN Surface in&nbsp;<strong>TIN Surface Manager<\/strong>&nbsp;<\/li>\n\n\n\n<li>Start\u00a0<strong>Erode Hole<\/strong>\u00a0<\/li>\n\n\n\n<li>Choose boundary method:\u00a0\n<ul class=\"wp-block-list\">\n<li><strong>Select Closed Polyline<\/strong>&nbsp;<\/li>\n\n\n\n<li><strong>Draw Polygon<\/strong>&nbsp;<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>Tool processes the surface and boundary\u00a0<\/li>\n\n\n\n<li>A\u00a0<strong>new TIN Surface<\/strong>\u00a0is created with the hole eroded\u00a0<\/li>\n<\/ol>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\"><\/ol>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\"><\/ol>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\"><\/ol>\n\n\n\n<ol start=\"5\" class=\"wp-block-list\"><\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">Erode Hole TIN Surface: Step-by-Step Usage<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Step 1 \u2014 Select Input Surface<\/strong>&nbsp;<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Open\u00a0<strong>TIN Surface Manager<\/strong>\u00a0<\/li>\n\n\n\n<li>Click to highlight\/select the TIN surface you want to modify\u00a0 (This is the surface that will be eroded.)\u00a0<\/li>\n<\/ol>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\"><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">If no surface is selected, the tool cannot&nbsp;proceed.&nbsp;<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Step 2 \u2014 Start the Erode Hole Command<\/strong>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Run the command from:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ribbon\/menu (if provided)\u00a0<\/li>\n\n\n\n<li>Command line (tool command name)&nbsp;<\/li>\n\n\n\n<li>Toolbar button (if configured)&nbsp;<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">You will be prompted to define the excavation boundary.&nbsp;<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Step 3 \u2014 Define the Hole Boundary<\/strong>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You will be given two options:&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em>Option&nbsp;A \u2014 Select Closed Polyline<\/em><\/strong>&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Select an existing&nbsp;<strong>closed polyline<\/strong>&nbsp;in the drawing.&nbsp;<\/li>\n\n\n\n<li>The polyline should&nbsp;represent&nbsp;the area to be removed.&nbsp;<\/li>\n<\/ul>\n\n\n\n<p class=\"has-theme-palette-1-color has-text-color has-link-color wp-elements-fadf209be747048f8c07e6a6a49394d9 wp-block-paragraph\">Best choice if you already have a design polygon or footprint.\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em>Option&nbsp;B \u2014 Draw Polygon<\/em><\/strong>&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>If you choose&nbsp;<strong>Draw Polygon<\/strong>, you will be asked to pick points to create a polygon.&nbsp;<\/li>\n\n\n\n<li>Finish the shape to close it (based on\u00a0the tool\u00a0prompt workflow).\u00a0<\/li>\n<\/ul>\n\n\n\n<p class=\"has-theme-palette-1-color has-text-color has-link-color wp-elements-7d730aeb8c7cefdbbdb2442279becbbd wp-block-paragraph\">Best for quick, manual excavation shapes.\u00a0<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Step 4 \u2014 Tool Creates the New Surface<\/strong>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">After you define the boundary, the tool performs the following steps:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>First<\/strong>, it identifies the triangles impacted by the boundary.<\/li>\n\n\n\n<li><strong>Next<\/strong>, it rebuilds the triangulation only within the affected \u201cpatch\u201d region.<\/li>\n\n\n\n<li><strong>Then<\/strong>, it removes the triangles inside the excavation boundary.<\/li>\n\n\n\n<li><strong>As a result<\/strong>, the tool creates a new TIN Surface.<\/li>\n\n\n\n<li><strong>Finally<\/strong>, it stores the surface as a separate dataset, ensuring the original surface remains intact.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Output from Erode Hole TIN Surface<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>What you get<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>As a result<\/strong>, you get a new TIN Surface that matches the original surface everywhere <strong>except<\/strong> within the eroded region.<\/li>\n\n\n\n<li><strong>Within this region<\/strong>, no triangles remain, creating a true \u201chole\u201d or void in the surface.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>What is not changed<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Meanwhile<\/strong>, your original TIN Surface remains completely untouched.<\/li>\n\n\n\n<li><strong>Additionally<\/strong>, all existing triangles outside the affected zone are preserved, <strong>ensuring<\/strong> fast performance and stable results.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Usability Notes<\/strong>&nbsp;<\/h3>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Boundary placement rules<\/strong>&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The boundary&nbsp;<strong>may be fully inside<\/strong>&nbsp;the surface, or&nbsp;<strong>partially outside<\/strong>&nbsp;the surface.&nbsp;<\/li>\n\n\n\n<li>If the boundary crosses the surface edge, the tool automatically clips the excavation to the valid surface area.&nbsp;<\/li>\n<\/ul>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>The boundary must be a single closed loop<\/strong>\u00a0<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Open polylines are rejected&nbsp;<\/li>\n\n\n\n<li>Polylines with self-intersections can cause failure or unexpected results&nbsp;<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Tips for Best Results<\/strong>&nbsp;<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>1) Use clean, simple boundaries<\/strong>&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Avoid extremely dense polylines with thousands of vertices.&nbsp;<\/li>\n\n\n\n<li>Avoid overlapping segments or tiny zig-zag vertices.&nbsp;<\/li>\n\n\n\n<li>If the boundary was generated from complex clipping, consider simplifying it.&nbsp;<\/li>\n<\/ul>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>2) Avoid self-intersections<\/strong>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Boundaries that cross themselves can create ambiguous regions and may fail.&nbsp;<\/p>\n\n\n\n<p class=\"has-theme-palette-1-color has-text-color has-link-color wp-elements-58df5d1efb5662f2c75719df94cdbd28 wp-block-paragraph\"><strong>Tip:<\/strong>\u00a0If unsure, run a quick check by converting it to a Region in CAD manually.\u00a0<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>3) Stay away from ultra-small slivers<\/strong>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If your boundary creates a very thin slice along the edge of the TIN, triangulation may become unstable.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Tip:<\/strong>&nbsp;Slightly adjust the boundary inward\/outward to remove near-zero-width \u201csliver\u201d areas.&nbsp;<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>4) Ensure your TIN boundary is valid<\/strong>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the input surface has broken edges, missing boundary metadata, or non-manifold triangulation, excavation might behave unpredictably.&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Performance Tips<\/strong>&nbsp;<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Large surfaces<\/strong>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">On large TINs, performance depends mostly on:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>number of triangles intersected by the boundary&nbsp;<\/li>\n\n\n\n<li>complexity of the boundary&nbsp;<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Because the tool re-triangulates only the affected band, it&nbsp;remains&nbsp;fast even for&nbsp;very large&nbsp;surfaces when the excavation area is small.&nbsp;<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Progress \/ Cancel<\/strong>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A progress window is shown during processing.&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>You can cancel the operation at any time.&nbsp;<\/li>\n\n\n\n<li>On cancel, the tool returns without creating a new surface.&nbsp;<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Common Issues &amp; Fixes<\/strong>&nbsp;<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u201cNothing happens\u201d \/ No new surface created<\/strong>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Possible causes:\u00a0<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The boundary does not intersect the TIN at all&nbsp;<\/li>\n\n\n\n<li>The boundary is outside the surface&nbsp;<\/li>\n\n\n\n<li>The affected triangle band is empty&nbsp;<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Fix:<\/strong>\u00a0<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Move the boundary so it overlaps the surface\u00a0<\/li>\n\n\n\n<li>Confirm you selected the correct TIN in the manager&nbsp;<\/li>\n<\/ul>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Errors during triangulation<\/strong>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Most common causes include:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>First<\/strong>, the boundary has self-intersections.<\/li>\n\n\n\n<li><strong>Additionally<\/strong>, the boundary overlaps itself or contains duplicate points.<\/li>\n\n\n\n<li><strong>In some cases<\/strong>, the boundary creates extremely tiny slivers.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>To fix these issues:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Start by<\/strong> simplifying the boundary polyline.<\/li>\n\n\n\n<li><strong>Next<\/strong>, remove any duplicate vertices.<\/li>\n\n\n\n<li><strong>Finally<\/strong>, avoid creating razor-thin shapes, especially near the surface edge.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Recommended Practices<\/strong>&nbsp;<\/h2>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Naming convention<\/strong>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When creating the new TIN surface, use a name like:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>OriginalName_ERODE_01&nbsp;<\/li>\n\n\n\n<li>Surface_PondHole&nbsp;<\/li>\n\n\n\n<li>Existing_ExcavationCut&nbsp;<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This helps track edits and allows multiple excavation variants.&nbsp;<\/p>\n\n\n\n<p class=\"has-medium-font-size wp-block-paragraph\"><strong>Preserve originals<\/strong>&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Because this tool generates a new surface, it is ideal for:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>comparing design options&nbsp;<\/li>\n\n\n\n<li>performing QA checks&nbsp;<\/li>\n\n\n\n<li>preserving existing conditions&nbsp;<\/li>\n<\/ul>\n","protected":false},"featured_media":0,"parent":4130,"menu_order":4,"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-4859","docs","type-docs","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Erode Hole TIN Surface | Excavate Sections in CAD with Precision<\/title>\n<meta name=\"description\" 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