Hi! 
The Curve plugin also has the feature that create a curve(s) from a selected edge(s) of an object(s).
This feature is very convenient for create multiple curves with object surface snapping.
It's simple ,quick and easy,Apply "convert to" command and choose a line type.
I tested it,and found some crashes.
How to reacrete it.
Note:
It occured ONLY the case when a curve generated from an edge!!
This crash doesn't occur on curve(s) created in the usual way.
For example, A Grid object and some curves create from the edge on the Grid.
Crash log is here.
The Curve plugin also has the feature that create a curve(s) from a selected edge(s) of an object(s).
This feature is very convenient for create multiple curves with object surface snapping.
It's simple ,quick and easy,Apply "convert to" command and choose a line type.
I tested it,and found some crashes.
How to reacrete it.
- Use "convert to" command , for create a curve from an object edge selection.
- Select the object body and the curve on curve plugin geometry window.
- Again,Use "convert to" command.
- Wings3d Crash(curve plugin geometry window is missing)
Note:
It occured ONLY the case when a curve generated from an edge!!
This crash doesn't occur on curve(s) created in the usual way.
For example, A Grid object and some curves create from the edge on the Grid.
Crash log is here.
Code:
Dump written 2021-1-30_8-40
Version: 2.2.6.1
OS: macOS Mojave Version 10.14.6 (Build 18G7016)
GPU: Intel Inc. | Intel Iris OpenGL Engine
Window: {plugin,{curves,geom}}
Reason: function_clause
Short stack trace:
[{curve_sel,map_1,5,[{file,"curve_sel.erl"},{line,512}]},
{curve_sel,map,2,[{file,"curve_sel.erl"},{line,119}]},
{curve_cmds,convert_curve,2,[{file,"curve_cmds.erl"},{line,1072}]},
{wpc_curves,raw_command,4,[{file,"wpc_curves.erl"},{line,867}]},
{wings_wm,handle_event,3,[{file,"wings_wm.erl"},{line,1030}]},
{wings_wm,send_event,2,[{file,"wings_wm.erl"},{line,996}]},
{wings_wm,do_dispatch,2,[{file,"wings_wm.erl"},{line,888}]},
{wings_wm,dispatch_event,1,[{file,"wings_wm.erl"},{line,797}]},
{wings_wm,get_and_dispatch,0,[{file,"wings_wm.erl"},{line,683}]},
{wings,init_part2,3,[{file,"wings.erl"},{line,108}]},
{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,249}]}]
Long stack trace:
[{curve_sel,map_1,
[#Fun<curve_cmds.54.106915862>,
[{2,{1,{0,nil,nil}}}],
[],
{cst,
{3,
{1,
{curve,1,nurbs,"Linear1",
{array,5,10,undefined,
{{cv,{-1.0,0.1,0.0},
{ctrlp,{-1.0,0.0,0.0},0.5},
{ctrlp,{1.0,0.0,0.0},0.5},
nurbs,
{1.0,1.0,0.0},
1.0},
{cv,{-0.5,0.1,0.0},
{ctrlp,{-1.0,0.0,0.0},0.5},
none,corner,
{1.0,1.0,0.0},
1.0},
{cv,{0.0,0.1,0.0},
{ctrlp,{1.0,0.0,0.0},1.0},
{ctrlp,{-1.0,0.0,0.0},0.5},
corner,
{1.0,1.0,0.0},
1.0},
{cv,{0.0,0.1,0.5},
{ctrlp,
{0.7071067811865475,0.0,0.7071067811865475},
0.7071067811865476},
{ctrlp,{0.0,0.0,-1.0},0.5},
corner,
{1.0,1.0,0.0},
1.0},
{cv,{0.5,0.1,0.5},
{ctrlp,
{0.7071067811865475,0.0,0.7071067811865475},
0.7071067811865476},
{ctrlp,{-1.0,0.0,0.0},0.5},
corner,
{1.0,1.0,0.0},
1.0},
undefined,undefined,undefined,undefined,undefined}},
{array,4,10,undefined,
{{segment,0,1},
{segment,1,2},
{segment,2,3},
{segment,3,4},
undefined,undefined,undefined,undefined,undefined,
undefined}},
6,false,true,tangent,
[{cp,{-1.0,0.1,0.0},
0.0,
{6.035001918489703e-4,2.89102826988864e-14,
-0.9999998178937427},
{0.9999998178937426,1.1577942288399038e-16,
6.035001918489702e-4},
{-1.3322676295501893e-16,1.0,2.89102075612391e-14}},
{cp,{-0.8801359953703705,0.10000000000000002,
7.233796296296297e-5},
0.11986402645761879,
{0.0025188836967441554,2.891045142943259e-14,
-0.9999968276074291},
{0.999996827607429,6.04048898119311e-17,
0.002518883696744155},
{-1.3322676295501893e-16,1.0,2.89102075612391e-14}},
{cp,{-0.7702546296296298,0.10000000000000002,
5.787037037037037e-4},
0.22974655893350332,
{0.008946648116488053,1.521591707801471e-14,
-0.9999599779428574},
{0.9999599779428573,-6.601474898902074e-17,
0.008946648116488052},
{-7.011934892369418e-17,1.0,1.5215898716441635e-14}},
{cp,{-0.669921875,0.1,0.001953125},
0.3300887269660369,
{0.021143308721553438,8.806376947389175e-16,
-0.9997764552620277},
{0.9997764552620277,-1.448668069267465e-16,
0.021143308721553438},
{1.2621482806264903e-16,1.0,8.835037964385562e-16}},
{cp,{-0.5787037037037037,0.09999999999999999,
0.0046296296296296285},
0.4213461565357595,
{0.0407654192301747,-1.3289498608657346e-14,
-0.9991687448048944},
{0.9991687448048944,0.0,0.0407654192301747},
{5.417519821407401e-16,1.0,-1.3278451643898551e-14}},
{cp,{-0.496166087962963,0.1,0.009042245370370367},
0.5040016414707691,
{0.06993901883730794,4.8019844680941475e-15,
-0.9975512686794974},
{0.9975512686794973,8.827341237421215e-17,
0.06993901883730792},
{-4.239033366750604e-16,1.0,4.784051942475684e-15}},
{cp,{-0.421875,0.1,0.015624999999999998},
0.5785838002571345,
{0.11132828538693379,4.225324576871482e-15,
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{0.9937836851512533,-9.797223030231444e-17,
0.11132828538693378},
{-3.730349362740523e-16,1.0,4.209965709378592e-15}},
{cp,{-0.3553964120370371,0.09999999999999999,
0.024811921296296287},
0.6456941733782381,
{0.1680811385619649,-1.000438492580594e-14,
-0.9857731639985507},
{0.9857731639985506,1.0893846164304924e-16,
0.16808113856196488},
{1.5741597969266176e-15,1.0,-9.880364682837279e-15}},
{cp,{-0.29629629629629634,0.10000000000000002,
0.037037037037037035},
0.7060454545199294,
{0.24342583378774083,8.08992339672232e-15,
-0.9699195139003768},
{0.9699195139003768,1.2098550163585668e-16,
0.24342583378774083},
{-2.0866425470617265e-15,1.0,7.817123571828261e-15}},
{cp,{-0.244140625,0.1,0.052734375},
0.7605121458779583,
{0.3395076921352739,-2.2495215973050015e-15,
-0.9406032782108407},
{0.9406032782108406,-1.3347003193232925e-16,
0.3395076921352738},
{8.892722354879305e-16,1.0,-2.0705932863206046e-15}},
{cp,{-0.19849537037037032,0.1,0.07233796296296299},
0.8101890009638568,
{0.4550577841940816,0.0,-0.8904619099345983},
{0.8904619099345983,0.0,0.4550577841940816},
{0.0,1.0,0.0}},
{cp,{-0.1589265046296296,0.1,0.09628182870370372},
0.856438366825665,
{0.5824484617281076,0.0,-0.8128676334007655},
{0.8128676334007655,0.0,0.5824484617281076},
{0.0,1.0,0.0}},
{cp,{-0.125,0.1,0.125},
0.9008876759202695,
{0.7038331911018929,-1.9956858201679207e-15,
-0.7103652856828847},
{0.7103652856828847,1.5664496694148627e-16,
0.7038331911018929},
{1.2933547725534111e-15,1.0,-1.5279178547293438e-15}},
{cp,{-0.09599247685185187,0.10000000000000002,
0.15863715277777776},
0.9453049523584519,
{0.7914264862155848,5.7917520452456275e-15,
-0.6112643592721998},
{0.6112643592721997,0.0,0.7914264862155846},
{-4.583745970200673e-15,1.0,3.5402916030005203e-15}},
{cp,{-0.07002314814814818,0.1,0.1961805555555555},
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{0.835623850811847,-6.554947667328161e-15,
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{0.5493020844256647,-1.4926586908380337e-16,
0.835623850811847},
{5.5594626646642325e-15,1.0,-3.475916296645923e-15}},
{cp,{-0.04492187500000007,0.1,0.23632812499999992},
1.0383035692608034,
{-0.8456313850566626,3.3539462570136323e-14,
0.533767328156333},
{0.533767328156333,-1.438222111714064e-16,
0.8456313850566626},
{-2.843878978462697e-14,-1.0,...}},
{cp,{-0.01851851851851862,0.09999999999999999,
0.2777777777777776},
1.0874483650065028,
{-0.8273559558129121,-9.661628373058788e-15,
0.561677952550127},
{0.561677952550127,0.0,...},
{7.993605777301204e-15,...}},
{cp,{0.01135706018518504,0.1,0.31922743055555536},
1.1385426300298842,
{-0.7803285914066049,2.7239312162272765e-15,...},
{0.6253697221911083,...},
{...}},
{cp,{0.04687499999999979,0.1,0.3593749999999998},
1.1921462808475785,
{-0.7018594509076441,...},
{...},...},
{cp,{0.09020543981481452,0.1,...},
1.2494789426267052,{...},...},
{cp,{0.1435185185185181,...},1.3125165695479564,...},
{cp,{...},...},
{cp,...},
{...}|...],
1.6789962282627842,
{none,none},
none,[],5,0},
nil,
{2,
{curve,2,linear,"Linear2",
{array,4,10,undefined,
{{cv,{0.5,0.1,1.0},
{ctrlp,{0.0,0.0,-1.0},0.5},
{ctrlp,{0.0,0.0,1.0},0.5},
linear,
{1.0,1.0,0.0},
1.0},
{cv,{0.5,0.1,1.5},
{ctrlp,{0.0,0.0,-1.0},0.5},
none,corner,
{1.0,1.0,0.0},
1.0},
{cv,{0.5,0.1,2.0},
{ctrlp,{0.0,0.0,1.0},1.0},
{ctrlp,{0.0,0.0,-1.0},0.5},
corner,
{1.0,1.0,0.0},
1.0},
{cv,{1.0,0.1,2.0},
{ctrlp,
{0.7071067811865475,0.0,0.7071067811865475},
0.7071067811865476},
{ctrlp,{-1.0,0.0,0.0},0.5},
corner,
{1.0,1.0,0.0},
1.0},
undefined,undefined,undefined,undefined,undefined,
undefined}},
{array,3,10,undefined,
{{segment,0,1},
{segment,1,2},
{segment,2,3},
undefined,undefined,undefined,undefined,undefined,
undefined,undefined}},
6,false,true,tangent,
[{cp,{0.5,0.1,1.0},
0.0,
{-1.0,0.0,0.0},
{0.0,0.0,1.0},
{0.0,-1.0,0.0}},
{cp,{0.5,0.1,1.5},
0.5,
{-1.0,0.0,0.0},
{0.0,0.0,1.0},
{0.0,-1.0,0.0}},
{cp,{0.5,0.1,2.0},
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{-0.7071067811865475,0.0,0.7071067811865475},
{0.7071067811865475,0.0,0.7071067811865475},
{0.0,-1.0,0.0}},
{cp,{1.0,0.1,2.0},
1.5,
{0.0,0.0,1.0},
{1.0,0.0,0.0},
{0.0,-1.0,0.0}}],
1.5,
{none,none},
none,[],4,0},
nil,
{3,
{curve,3,linear,"Linear3",
{array,3,10,undefined,
{{cv,{-1.0,0.1,1.0},
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corner,
{1.0,1.0,0.0},
1.0},
undefined,undefined,undefined,undefined,undefined,
undefined,undefined}},
{array,2,10,undefined,
{{segment,0,1},
{segment,1,2},
undefined,undefined,undefined,undefined,undefined,
undefined,undefined,undefined}},
6,false,true,tangent,
[{cp,{-1.0,0.1,1.0},
0.0,
{-1.0,0.0,0.0},
{0.0,0.0,1.0},
{0.0,-1.0,0.0}},
{cp,{-1.0,0.1,1.5},
0.5,
{-0.7071067811865475,0.0,0.7071067811865475},
{0.7071067811865475,0.0,0.7071067811865475},
{0.0,-1.0,0.0}},
{cp,{-0.5,0.1,1.5},
1.0,
{0.0,0.0,1.0},
{1.0,0.0,0.0},
{0.0,-1.0,0.0}}],
1.0,
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{0,nil},
body,
[{1,{1,{0,nil,nil}}},
{2,{1,{0,nil,nil}}},
{3,{1,{0,nil,nil}}},
{2,{1,{0,nil,nil}}}],
4,1,none,none,none,none,none,
{one,{1611,963636,278027}},
none,none,none,none,
{{curve,body},{to_curve,linear}},
none,none},
[{3,
{curve,3,linear,"Linear3",
{array,3,10,undefined,
{{cv,{-1.0,0.1,1.0},
{ctrlp,{0.0,0.0,-1.0},0.5},
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none,corner,
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{cv,{-0.5,0.1,1.5},
{ctrlp,
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corner,
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1.0},
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undefined}},
{array,2,10,undefined,
{{segment,0,1},
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undefined,undefined,undefined,undefined,undefined,undefined,
undefined,undefined}},
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{-1.0,0.0,0.0},
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{cp,{-1.0,0.1,1.5},
0.5,
{-0.7071067811865475,0.0,0.7071067811865475},
{0.7071067811865475,0.0,0.7071067811865475},
{0.0,-1.0,0.0}},
{cp,{-0.5,0.1,1.5},
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{0.0,0.0,1.0},
{1.0,0.0,0.0},
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{2,
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{{cv,{0.5,0.1,1.0},
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{ctrlp,{0.0,0.0,1.0},0.5},
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{1.0,1.0,0.0},
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{cv,{0.5,0.1,1.5},
{ctrlp,{0.0,0.0,-1.0},0.5},
none,corner,
{1.0,1.0,0.0},
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{cv,{0.5,0.1,2.0},
{ctrlp,{0.0,0.0,1.0},1.0},
{ctrlp,{0.0,0.0,-1.0},0.5},
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{0.7071067811865475,0.0,0.7071067811865475},
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{{segment,0,1},
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undefined,undefined,undefined,undefined,undefined,undefined,
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{cp,{1.0,0.1,2.0},
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{array,4,10,undefined,
{{segment,0,1},
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{segment,2,3},
{segment,3,4},
undefined,undefined,undefined,undefined,undefined,undefined}},
6,false,true,tangent,
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{0.0,0.0,-1.0},
{1.0,0.0,0.0},
{0.0,1.0,0.0}},
{cp,{-0.5,0.1,0.0},
0.5,
{0.0,0.0,-1.0},
{1.0,0.0,0.0},
{0.0,1.0,0.0}},
{cp,{0.0,0.1,0.0},
1.0,
{0.7071067811865475,0.0,-0.7071067811865475},
{0.7071067811865475,0.0,0.7071067811865475},
{0.0,1.0,0.0}},
{cp,{0.0,0.1,0.5},
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{0.7071067811865474,0.0,-0.7071067811865474},
{0.7071067811865475,0.0,0.7071067811865475},
{0.0,1.0,0.0}},
{cp,{0.5,0.1,0.5},
2.0,
{0.0,0.0,1.0},
{1.0,0.0,0.0},
{0.0,-1.0,0.0}}],
2.0,
{none,none},
none,[],5,0}}]],
[{file,"curve_sel.erl"},{line,512}]},
{curve_sel,map,2,[{file,"curve_sel.erl"},{line,119}]},
{curve_cmds,convert_curve,2,[{file,"curve_cmds.erl"},{line,1072}]},
{wpc_curves,raw_command,4,[{file,"wpc_curves.erl"},{line,867}]},
{wings_wm,handle_event,3,[{file,"wings_wm.erl"},{line,1030}]},
{wings_wm,send_event,2,[{file,"wings_wm.erl"},{line,996}]},
{wings_wm,do_dispatch,2,[{file,"wings_wm.erl"},{line,888}]},
{wings_wm,dispatch_event,1,[{file,"wings_wm.erl"},{line,797}]},
{wings_wm,get_and_dispatch,0,[{file,"wings_wm.erl"},{line,683}]},
{wings,init_part2,3,[{file,"wings.erl"},{line,108}]},
{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,249}]}]