{"id":2445,"date":"2019-12-09T09:40:26","date_gmt":"2019-12-09T09:40:26","guid":{"rendered":"https:\/\/www.katsbits.com\/codex\/?p=2445"},"modified":"2023-09-07T15:52:45","modified_gmt":"2023-09-07T14:52:45","slug":"knife","status":"publish","type":"post","link":"https:\/\/www.katsbits.com\/codex\/knife\/","title":{"rendered":"Knife"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-69fe65b1a0442\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-69fe65b1a0442\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.katsbits.com\/codex\/knife\/#using-knife\" >Using Knife<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.katsbits.com\/codex\/knife\/#closing-a-knife-cut\" >Closing a Knife Cut<\/a><\/li><\/ul><\/nav><\/div>\n<p>For Blender 2.8+ <b>Knife<\/b>, the tool that allows cuts and divisions to be selectively (manually) placed on an object or mesh, remains ostensibly the same as it has been in previous versions with the exception that, alongside the reorganisation of the the interface, a dedicated icon in the <strong>Toolbar<\/strong> on the left becomes available when <b>Edit Mode<\/b> is active.<\/p>\n<blockquote><p><b>Design note<\/b>: the Knife tools initial behaviour changes slightly depending on how its activated; using the shortcut, <span class=\"shortcutkey\">K<\/span>, or the <b>Toolbar<\/b> icon. Using the former a (green) selection confirmation box appears highlighting the nearest vertex or edge alongside the knife mouse-cursor sprite (not shown), whereas the latter only shows the cursor sprite, the knife (not shown), the selection box appearing after the cut is started. In addition, using the shortcut key does not enable the Toolbar icon (its not switched &#8216;on&#8217;).<\/p>\n<p><a href=\"https:\/\/www.katsbits.com\/images\/tutorials\/knife\/shortcut.jpg\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" style=\"width: 98.5%; height: auto;\" src=\"https:\/\/www.katsbits.com\/images\/tutorials\/knife\/shortcut.jpg\" alt=\"Knife behaves differently when started from shortcut key\" width=\"900px\" height=\"500px\" border=\"0\" \/><\/a><br \/>\n<i>When Knife is initiated using the shortcut, <span class=\"shortcutkey\">K<\/span>, the tool displays a highlight box that snaps to the nearest edge or vertex. This differs from initialisation by Toolbar icon.<\/i><\/p><\/blockquote>\n<h3><span class=\"ez-toc-section\" id=\"using-knife\"><\/span>Using Knife<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Using the Knife tool is relatively straightforward for most applications; first select the object to be cut and then switch to <b>Edit Mode<\/b> (<span class=\"shortcutkey\">Tab<\/span>). In the Toolbar to the left click the <b>Knife icon<\/b> &#8211; about 1\/3rd of the way up the bar (from the bottom). The tool will initialise and the mouse cursor will change to a knife sprite.<\/p>\n<p><a href=\"https:\/\/www.katsbits.com\/images\/tutorials\/knife\/toolbar-knife.jpg\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" style=\"width: 100%; height: auto;\" src=\"https:\/\/www.katsbits.com\/images\/tutorials\/knife\/toolbar-knife.jpg\" alt=\"The Knife tool available in the Toolbar\" width=\"900px\" height=\"500px\" border=\"0\" \/><\/a><br \/>\n<i>Once <b>Edit Mode<\/b> is active and the Toolbar tools change to suit, the <b>Knife<\/b> tool will be available for use.<\/i><\/p>\n<p>To cut, mouse over the object, a surface, edge or vertex, and click to initiate a cut [1]. A green node appears confirming the start or initial point of the cut. Move the mouse to a new location and click again [3] to place another &#8216;node&#8217;. Repeat to trace a &#8216;path&#8217; [4], the &#8216;cut&#8217; line (line along which a cut will occur) [2]. To complete press <span class=\"shortcutkey\">Enter<\/span>.<\/p>\n<blockquote><p><b>Design note<\/b>: Knife cuts are defined by the cut-line displayed between positioned (clicked and placed) nodes. To cancel press <span class=\"shortcutkey\">Esc<\/span> or right-click if <a href=\"https:\/\/www.katsbits.com\/codex\/left-click-select\/\">right-click is set as the default selection button<\/a>.<\/p><\/blockquote>\n<p><a href=\"https:\/\/www.katsbits.com\/images\/tutorials\/knife\/knife-start.jpg\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" style=\"width: 100%; height: auto;\" src=\"https:\/\/www.katsbits.com\/images\/tutorials\/knife\/knife-start.jpg\" alt=\"The Knife tool highlights the start of a cut\" width=\"900px\" height=\"500px\" border=\"0\" \/><\/a><br \/>\n<i>As soon as the first cut point is placed a green box (outlined red) appears highlighting the location &#8211; this can be a random spot on a Face, and Edge or a specific Vertex, in each case the initial point is indicated.<\/i><\/p>\n<p><a href=\"https:\/\/www.katsbits.com\/images\/tutorials\/knife\/knife-cut-path.jpg\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" style=\"width: 100%; height: auto;\" src=\"https:\/\/www.katsbits.com\/images\/tutorials\/knife\/knife-cut-path.jpg\" alt=\"Cut path and nodes shown\" width=\"900px\" height=\"500px\" border=\"0\" \/><\/a><br \/>\n<video poster=\"\" controls=\"controls\" width=\"100%\" height=\"auto\"><source src=\"https:\/\/www.katsbits.com\/images\/tutorials\/knife\/knife.mp4\" type=\"video\/mp4\" \/><!--<source src=\"https:\/\/www.katsbits.com\/images\/tutorials\/collections\/collection-shortcut.ogg\" type=\"video\/ogg\" \/>\n<source src=\"https:\/\/www.katsbits.com\/images\/tutorials\/collections\/collection-shortcut.webm\" type=\"video\/webm\" \/>--><\/video><br \/>\n<i>After placing the initial cut a cut path [2] is then shown between multiple points [3], the cursor still displaying the tool [4] until <span class=\"shortcutkey\">Enter<\/span> is pressed to complete the cut.<\/i><\/p>\n<h3><span class=\"ez-toc-section\" id=\"closing-a-knife-cut\"><\/span>Closing a Knife Cut<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>To make a <i>closed<\/i> or <i>loop<\/i> cut, click around the mesh to place a set of node that define a cut path and that will also accommodate a closed path (avoid loopback). Then for the final node, mouse over the start point, an inset box will appear indicating coincidence (occupying the same location). Click this highlighted node, setting the path and closing the loop. Press <span class=\"shortcutkey\">Enter<\/span> to confirm and complete the cut.<\/p>\n<blockquote><p><b>Design note<\/b>: in this context a &#8216;loop&#8217; is simply a manually defined path that ends on the same node from which it is started. Cutting arbitrarily shapes using the Knife tool generally, and more so where closed circuits are needed, tends to produce structure that&#8217;s not conducive to good edge or mesh flow, so some degree of reoptimisation may be necessary.<\/p><\/blockquote>\n<p><a href=\"https:\/\/www.katsbits.com\/images\/tutorials\/knife\/closed-cut.jpg\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" style=\"width: 100%; height: auto;\" src=\"https:\/\/www.katsbits.com\/images\/tutorials\/knife\/closed-cut.jpg\" alt=\"Closing a cut to form a 'loop'\" width=\"900px\" height=\"500px\" border=\"0\" \/><\/a><br \/>\n<video poster=\"\" controls=\"controls\" width=\"100%\" height=\"auto\"><source src=\"https:\/\/www.katsbits.com\/images\/tutorials\/knife\/knife-loop-cut.mp4\" type=\"video\/mp4\" \/><!--<source src=\"https:\/\/www.katsbits.com\/images\/tutorials\/collections\/collection-shortcut.ogg\" type=\"video\/ogg\" \/>\n<source src=\"https:\/\/www.katsbits.com\/images\/tutorials\/collections\/collection-shortcut.webm\" type=\"video\/webm\" \/>--><\/video><br \/>\n<i>The <b>Knife<\/b> tool can be used to create &#8216;closed&#8217; or &#8216;loop&#8217; cuts, cuts that end where they start, by clicking out a node path to define a shape, the last point being to click on the first thus closing the loop (resultant structure, vertex, edge and face placement\/positioning may require additional optimisation).<\/i><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":2450,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[34,230],"tags":[642,346,640,349,644,233,643,641,645],"class_list":["post-2445","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blender","category-tutorials","tag-bisect","tag-edit-mode","tag-knife","tag-loop-cut","tag-quick-access","tag-shortcuts","tag-slice","tag-toolbar","tag-widget"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/www.katsbits.com\/codex\/wp-json\/wp\/v2\/posts\/2445","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.katsbits.com\/codex\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.katsbits.com\/codex\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.katsbits.com\/codex\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.katsbits.com\/codex\/wp-json\/wp\/v2\/comments?post=2445"}],"version-history":[{"count":5,"href":"https:\/\/www.katsbits.com\/codex\/wp-json\/wp\/v2\/posts\/2445\/revisions"}],"predecessor-version":[{"id":5105,"href":"https:\/\/www.katsbits.com\/codex\/wp-json\/wp\/v2\/posts\/2445\/revisions\/5105"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.katsbits.com\/codex\/wp-json\/wp\/v2\/media\/2450"}],"wp:attachment":[{"href":"https:\/\/www.katsbits.com\/codex\/wp-json\/wp\/v2\/media?parent=2445"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.katsbits.com\/codex\/wp-json\/wp\/v2\/categories?post=2445"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.katsbits.com\/codex\/wp-json\/wp\/v2\/tags?post=2445"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}