Need the length of a curved line in HyperMesh \u2014 the actual arc length, not the straight-line distance between its endpoints? There’s a built-in Tcl query command for exactly that: It returns the true length along the curve, correctly handling curvature \u2014 not a chord approximation. Pass it several IDs at once and it returns their summed length (each ID only counted once, even if repeated).<\/p>\n Some HyperMesh versions expose Swap Measuring Curve Lengths in HyperMesh with Tcl Need the length of a curved line in HyperMesh \u2014 the actual arc length, not the straight-line distance between its endpoints? There’s a built-in Tcl query command for exactly that: hm_linelength. The command hm_linelength $line_id It returns the true length along the curve, correctly handling curvature \u2014 not […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","_lmt_disableupdate":"","_lmt_disable":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[24,27,334],"tags":[341,339,340,342],"class_list":["post-10739","post","type-post","status-publish","format-standard","hentry","category-hypermesh","category-tcl","category-tcl-scripting","tag-curve-length","tag-hm_linelength","tag-hypermesh-api","tag-line-measurement"],"modified_by":"gantovnik","jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p8bH0k-2Nd","jetpack_likes_enabled":true,"jetpack-related-posts":[{"id":1494,"url":"https:\/\/gantovnik.com\/bio-tips\/2022\/06\/210-parametric-curve-in-3d-2-2-2-2-2-2-2-2-2-2-2-2-2-3-2-2-2-2-2-2-2-2-2-3-2-2-2-2-2-2-2-2-2\/","url_meta":{"origin":10739,"position":0},"title":"#285 Find min and max lengths of lines in HyperMesh database","author":"gantovnik","date":"2022-06-15","format":false,"excerpt":"#285 Find min and max lengths of lines in HyperMesh database","rel":"","context":"In "HyperMesh"","block_context":{"text":"HyperMesh","link":"https:\/\/gantovnik.com\/bio-tips\/category\/hypermesh\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/gantovnik.com\/bio-tips\/wp-content\/uploads\/2022\/06\/2022-06-15_143821.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/gantovnik.com\/bio-tips\/wp-content\/uploads\/2022\/06\/2022-06-15_143821.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/gantovnik.com\/bio-tips\/wp-content\/uploads\/2022\/06\/2022-06-15_143821.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/gantovnik.com\/bio-tips\/wp-content\/uploads\/2022\/06\/2022-06-15_143821.jpg?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/gantovnik.com\/bio-tips\/wp-content\/uploads\/2022\/06\/2022-06-15_143821.jpg?resize=1050%2C600&ssl=1 3x"},"classes":[]},{"id":1512,"url":"https:\/\/gantovnik.com\/bio-tips\/2022\/06\/210-parametric-curve-in-3d-2-2-2-2-2-2-2-2-2-2-2-2-2-3-2-2-2-2-2-2-2-2-2-3-2-2-2-2-2-2-2-2-2-2\/","url_meta":{"origin":10739,"position":1},"title":"#286 Creates a fillet between two lines using HyperMesh Tcl","author":"gantovnik","date":"2022-06-24","format":false,"excerpt":"#285 Find min and max lengths of lines in HyperMesh database line1 id = The ID of the first line to which the fillet line is to be created. line2 id = The ID of the second line to which the fillet line is to be created. radius = The\u2026","rel":"","context":"In "HyperMesh"","block_context":{"text":"HyperMesh","link":"https:\/\/gantovnik.com\/bio-tips\/category\/hypermesh\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":773,"url":"https:\/\/gantovnik.com\/bio-tips\/2020\/11\/131-use-a-panel-to-create-an-ordered-list-of-entities-for-use-in-a-subsequent-command-in-tcl-in-hypermesh\/","url_meta":{"origin":10739,"position":2},"title":"#131 Use a panel to create an ordered list of entities for use in a subsequent command in tcl in HyperMesh","author":"gantovnik","date":"2020-11-06","format":false,"excerpt":"#131 Use a panel to create an ordered list of entities for use in a subsequent command in tcl in HyperMesh To create a line from a user specified list of nodes:","rel":"","context":"In "HyperMesh"","block_context":{"text":"HyperMesh","link":"https:\/\/gantovnik.com\/bio-tips\/category\/hypermesh\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1727,"url":"https:\/\/gantovnik.com\/bio-tips\/2022\/12\/210-parametric-curve-in-3d-2-2-2-2-2-2-2-2-2-2-2-2-2-3-2-2-2-2-2-2-2-2-2-3-2-2-2-2-2-2-2-2-2-2-4\/","url_meta":{"origin":10739,"position":3},"title":"#327 Creates nodes with coordinates from text file using HyperMesh Tcl","author":"gantovnik","date":"2022-12-14","format":false,"excerpt":"nodes.txt create_nodes.tcl","rel":"","context":"In "HyperMesh"","block_context":{"text":"HyperMesh","link":"https:\/\/gantovnik.com\/bio-tips\/category\/hypermesh\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/gantovnik.com\/bio-tips\/wp-content\/uploads\/2022\/12\/ex327.png?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":10734,"url":"https:\/\/gantovnik.com\/bio-tips\/2026\/04\/get-current-hypermesh-model-name-using-tcl\/","url_meta":{"origin":10739,"position":4},"title":"#468 How to Get the Name of the Current Model Opened in HyperMesh Using Tcl","author":"gantovnik","date":"2026-04-30","format":false,"excerpt":"When working with Tcl scripts in HyperMesh, it is often useful to get the name of the currently opened model file. For example, you may want to automatically create output files, reports, or logs using the same name as the active HyperMesh model. HyperMesh provides the command hm_info currentfile, which\u2026","rel":"","context":"In "HyperMesh"","block_context":{"text":"HyperMesh","link":"https:\/\/gantovnik.com\/bio-tips\/category\/hypermesh\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":943,"url":"https:\/\/gantovnik.com\/bio-tips\/2021\/09\/170-gets-the-distance-of-the-given-point-from-the-nearest-line-with-ids-specified-as-arguments-in-hypermesh-tcl\/","url_meta":{"origin":10739,"position":5},"title":"#170 Gets the distance of the given point from the nearest line with IDs specified as arguments in HyperMesh tcl","author":"gantovnik","date":"2021-09-01","format":false,"excerpt":"#170 Gets the distance of the given point from the nearest line with IDs specified as arguments in HyperMesh tcl. To get closest to the point with coordinates (10, 20, 30) point on the line with ID 13: To get closest line from the set with IDs 13 14 15:\u2026","rel":"","context":"In "HyperMesh"","block_context":{"text":"HyperMesh","link":"https:\/\/gantovnik.com\/bio-tips\/category\/hypermesh\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"_links":{"self":[{"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/posts\/10739","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/comments?post=10739"}],"version-history":[{"count":1,"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/posts\/10739\/revisions"}],"predecessor-version":[{"id":10740,"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/posts\/10739\/revisions\/10740"}],"wp:attachment":[{"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/media?parent=10739"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/categories?post=10739"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/tags?post=10739"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}hm_linelength<\/code>.<\/p>\nThe command<\/h2>\n
hm_linelength $line_id\n<\/code><\/pre>\nMeasuring every line in the model<\/h2>\n
proc measure_all_line_lengths {{csv_path \"\"}} {\n *createmark lines 1 \"all\"\n set line_ids [hm_getmark lines 1]\n *clearmark lines 1\n\n set total 0.0\n set rows {}\n foreach lid $line_ids {\n set len [hm_linelength $lid]\n puts \"Line $lid : length = $len\"\n lappend rows \"$lid,$len\"\n set total [expr {$total + $len}]\n }\n\n puts \"----\"\n puts \"[llength $line_ids] lines, total length = $total\"\n\n if {$csv_path != \"\"} {\n set fh [open $csv_path w]\n puts $fh \"line_id,length\"\n foreach r $rows { puts $fh $r }\n close $fh\n }\n\n return $total\n}\n\nmeasure_all_line_lengths \"line_lengths.csv\"\n<\/code><\/pre>\n*createmark lines 1 \"all\"<\/code> grabs every line in the database, hm_getmark<\/code> pulls the IDs into a Tcl list, and the loop reports each one’s length plus a running total \u2014 optionally dumped to a CSV for a spreadsheet.<\/p>\nOne gotcha<\/h2>\n
hm_createmark<\/code> \/ hm_clearmark<\/code> as convenience wrappers; others don’t, and you’ll hit invalid command name \"hm_clearmark\"<\/code>. The asterisk-prefixed originals \u2014 *createmark<\/code> and *clearmark<\/code>, used above \u2014 are the safer, universally-available choice.<\/p>\nMeasuring a specific selection instead<\/h2>\n
\"all\"<\/code> for an interactive pick if you only want a handful of curves:<\/p>\nproc measure_selected_line_lengths {} {\n *createmark lines 1\n *createmarkpanel lines 1 \"Select curves to measure\"\n set line_ids [hm_getmark lines 1]\n *clearmark lines 1\n\n set total 0.0\n foreach lid $line_ids {\n set len [hm_linelength $lid]\n puts \"Line $lid : length = $len\"\n set total [expr {$total + $len}]\n }\n puts \"Total selected length: $total\"\n return $total\n}\n<\/code><\/pre>\n*createmarkpanel<\/code> opens the standard entity-selection prompt in the modeling window and waits for you to pick curves before continuing.<\/p>\n","protected":false},"excerpt":{"rendered":"