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mikedh / trimesh

Python library for loading and using triangular meshes.
https://trimesh.org
MIT License
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trimesh 3.20.2 : Triangulation not working properly ? #1869

Closed esgn closed 1 year ago

esgn commented 1 year ago

Hi,

I know this mesh is very raw, not triangular and probably with small defects, but Meshlab, CloudCompare or even Blender are able to display it properly (and I suppose triangulate it beforehand).

When I try something as simple as :

obj = trimesh.load(obj_file)
obj.show()

I get the following result

trimeshow

Here is the obj file containing the mesh in question:

Display the obj file ```obj v 4.390864464803599 -11.0629640314728 386.0019029031517 v -6.809135535149835 -8.462964031845331 378.7678279056522 v -9.409135535126552 -3.262964031659067 380.4592533403219 v 10.79086446482688 -4.862964031286538 385.8191905168894 v 0.590864464873448 -2.662964032031596 383.5468531177094 v 4.290864464826882 9.737035968340933 386.7325877547008 v 4.348049115401979 -10.96831957490527 386.0017011256683 v 5.819433478904329 -2.873499247399263 388.0788858163373 v 2.99786673623557 4.066554636091178 388.193829173091 v -0.8487949373548349 4.859986900559198 386.7691139410543 v 4.398073344029926 0.6225427829737671 388.1367883648 v 0.6697428115114207 4.546765477152777 387.3315454842515 v 0.7252373275027034 4.488355194815303 387.3435311608218 v 4.517010704533659 -10.03877747822562 386.240227805006 v 4.365280750729498 -10.87351974191385 386.0260273928121 v 3.734049372501584 -9.611056985401403 385.998807506331 v -0.8487949373548349 4.859986900559198 386.7691139410543 v 5.325568563135984 -10.1574694361894 386.548471943338 v -1.929715150939424 3.834296186936784 386.140958447019 v 3.350358620535399 -8.762898481131952 385.9969992727083 v 5.819433478904329 -2.873499247399263 388.0788858163373 v 5.819433478904329 -2.873499247399263 388.0788858163373 v 2.318631748505117 5.737231903126768 388.221499455822 v 10.24157170977678 -3.629167996897921 386.3895097255155 v 4.370878274093778 9.557312642914878 386.8155594369132 v -9.340222897979992 -3.400789305958358 380.4144223452292 v -1.405050208829642 -4.227329587041018 378.7653210064555 v -8.612622830921795 -4.85598944013991 379.9410833991905 v -8.271886784573359 -5.537461532867294 379.7194181625337 v -1.355449248314598 -4.188453158530598 378.7652979970838 v -4.260823574140302 1.622295493380988 380.6553841632305 v 4.716760602671776 -8.939853515206339 386.5222189968841 v 5.325568563135984 -10.1574694361894 385.9374959802899 v 10.24157170977678 -3.629167996897921 386.3895097255155 v -3.869180910541344 1.993927217965248 383.5141381875911 v 0.5007317122743514 -2.733608621903892 383.5130722897796 v 0.7398458370984879 -2.992291275882096 383.5130139656794 v 0.0533020980521261 -2.249562436172206 383.5131814256566 v 0.3531580949782143 -2.849274430051178 383.457763217005 v -4.260823574140161 1.622295493380709 383.3543546531604 v -1.355449248314526 -4.188453158530757 382.8173947715839 v -2.748254393685888 0.7812667508823458 383.5138647740873 v -0.5708661814758134 -3.573509673732814 383.1114484292529 v -3.869180910541344 1.993927217965248 383.5141381875911 v -1.355449248314526 -4.188453158530757 382.8173947715839 v -4.260823574140161 1.622295493380709 383.3543546531604 v -1.92971515093935 3.834296186936916 384.3054071753174 v 4.426472798940155 9.432438787110758 386.8115248145086 v 4.366438146250399 9.539556297225776 386.8200165690359 v 3.350358620537145 -8.762898481100359 382.9200704477377 v 4.024151206383475 9.483950394634753 386.7344832145783 v 4.366438146250399 9.539556297225776 386.8200165690359 v 2.99786673623557 4.066554636091178 388.193829173091 v 4.370878274093778 9.557312642914878 386.8155594369132 v 0.7726730608315394 4.525534553371297 387.3696684871272 v 3.683048738306553 6.806639814014508 387.506023141467 v 4.348587153503988 9.468169073844617 386.8379359254183 v 4.348587153503988 9.468169073844617 386.8379359254183 v 0.6697428115114207 4.546765477152777 387.3315454842515 v 4.398073344029926 0.6225427829737671 388.1367883648 v 2.344785203064972 2.783713808501534 387.6933202648538 v 2.807410677253089 2.296781287662063 387.7932378730707 v 1.840770737541596 -4.183313242014269 383.5127454309182 v -0.1713798843861249 -2.006493016659546 383.513236229506 v -1.929715150939424 3.834296186936784 381.9008512871214 v 3.350358620536878 -8.762898481099279 384.7189324819101 v -3.276025977829594 1.352229901559377 383.5139935067704 v -1.417157494829135 2.809180874670417 384.210678280703 v -1.417157494829255 2.809180874670547 386.1630608989813 v 3.683048738306553 6.806639814014508 387.506023141467 v 2.318631748505117 5.737231903126768 388.221499455822 v 3.683048738306553 6.806639814014508 387.506023141467 v 0.7726730608315394 4.525534553371297 387.3696684871272 v 4.360506349363072 7.337620103742215 387.1507762643659 v 5.100782141081848 7.917836264799302 386.7625886362258 v -3.886536611144789 0.8737215673562819 383.2851804054433 v -1.417157494829255 2.809180874670547 382.0934385676329 v -3.886536611144755 0.8737215673563749 380.4118924366607 v -3.276025977829594 1.352229901559377 383.5139935067704 v -3.886536611144789 0.8737215673562819 383.2851804054433 v 2.318631748505117 5.737231903126768 388.221499455822 v 0.7726730608315394 4.525534553371297 387.3696684871272 v 0.311594664318217 -1.627945397418216 383.1441450931971 v 3.730210380975117 -8.465176831037763 383.0624349777024 v 0.3115946643186985 -1.627945397418553 383.6942501190611 v 3.730210380973733 -8.465176831038063 386.2062994924581 v 3.730210380974743 -8.465176831037114 384.4286482044777 v -1.76906052671117 2.53336498482688 382.3623643117663 v -2.261913684712499 3.519071300873673 382.1771807558105 v 1.292954459143892 -3.590664987157072 383.5128790528514 v 4.820836349492112 -10.64642876816981 386.2533293393261 v -2.761051186717811 0.7951108029077902 383.5138678954482 v -2.761051186717811 0.7951108029077902 383.5138678954482 v -0.7526758633380126 -3.71600915410689 383.0433080318738 v -3.46536569335235 2.377109540846574 383.1782365111238 v -3.078136257876524 1.507332655030755 383.3627653689786 v -0.09727407682287437 -1.948410086409394 383.4566042666129 v -0.09727407682277184 -1.948410086409155 383.5410103234033 v 4.437441933907831 -11.01784210827689 386.0291391190066 v -2.177929267852261 2.212900295835703 382.6748234851822 v -2.647888183387153 3.152818126947572 382.4982421612746 v -1.965993504190557 -2.967364646723118 382.9302331650461 v -1.965993504190557 -2.967364646723118 382.9302331650461 v -1.965993504190678 -2.967364646723764 379.1624864906952 v -3.730510603367683 0.9960122220961688 383.3436573471688 v -4.08402519404703 1.790060379601485 383.426485380169 v 3.765153351424738 7.134981236825073 387.4236040937453 v 2.337924294134555 5.752353087538601 388.2113827836136 v 3.765153351424738 7.134981236825073 387.4236040937453 v 2.337924294130299 5.75235308753535 387.4430024187304 v 4.358424704443244 7.709712860076761 387.0961398182457 v 2.337924294130299 5.75235308753535 387.4430024187304 v 2.337924294134555 5.752353087538601 388.2113827836136 v 4.941823930665127 8.274880860495015 386.7741245987852 v -1.183199340636554 2.341264566263234 384.1674390527479 v -1.183199340637508 2.341264566264302 386.1731496154457 v 2.319672605428146 5.734671764105771 388.2214570539938 v -3.498725248813138 0.09809884265899695 383.2135066313136 v 0.8728125797376116 4.333026114178866 387.3754043866993 v -1.183199340636516 2.341264566263949 382.1813454872394 v -1.513177261849265 2.021598455080431 382.4585093239824 v -3.498725248813221 0.09809884265858039 380.1596024358503 v 2.319672605428146 5.734671764105771 388.2214570539938 v 1.019068689872973 4.474711720876125 387.4609277752034 v -2.766528733875515 0.807414216523493 383.5112576457401 v -2.769638865520335 0.8044012767224419 383.5138699901325 v -2.769638865520335 0.8044012767224419 383.5138699901325 v -3.38136938627607 0.2117873344949974 383.2618539902113 v -1.896571677433553 1.650185114973339 382.7805401641625 v -3.498725248813138 0.09809884265899695 383.2135066313136 v -2.033617430899543 -0.6480071747541916 383.3817883750164 v -1.681910068921433 -0.3723446478087891 383.5136046741311 v -0.1624556842422781 0.8185790590583659 387.8262630965168 v 3.235567653956418 3.481894648365033 388.1841458503564 v 4.377071626476091 4.376586951119334 387.5855612085754 v 6.082326024657718 5.713137695592788 386.6913557413552 v -2.096592374300664 -0.6973659141756142 383.3581860144362 v 3.235567653956418 3.481894648365033 388.1841458503564 v -2.74896671979196 -1.208686347110181 383.1136828246923 v -1.681910068921433 -0.3723446478087891 383.5136046741311 v -2.818200497738134 -1.262950659552738 383.0877347173474 v -0.1624556842427779 0.8185790590595827 386.3118179965102 v -0.3488213814226017 0.6725086477615183 384.0132325926072 v -0.3488213814226223 0.6725086477616118 386.2091295652953 v 2.344785203064972 2.783713808501534 387.6933202648538 v -2.818200497738134 -1.262950659552738 383.0877347173474 v 2.344785203064972 2.783713808501534 387.6933202648538 v -0.3488213814226223 0.6725086477616118 382.4948528169379 v -0.7007244133045369 0.3966927579179448 382.7637785610714 v -2.818200497738122 -1.262950659552561 379.7168882539652 v -1.109593154445628 0.07622806892676766 383.0762377344872 v -1.965993504190678 -2.967364646723764 379.1624864906952 v -1.355449248314598 -4.188453158530598 378.7652979970838 v -4.260823574140302 1.622295493380988 380.6553841632305 v -3.886536611144755 0.8737215673563749 380.4118924366607 v -2.818200497738122 -1.262950659552561 379.7168882539652 v -3.498725248813221 0.09809884265858039 380.1596024358503 v 4.364927175110071 6.547400205277256 387.2668086411608 v 3.436200763318614 5.819479504168867 387.753816465836 v 5.362729734384366 7.329461670626624 386.7435784975173 v -3.601426512220147 0.3035013694818306 383.2324874757943 v -9.055112799055395 -3.97100950383308 380.2289444709959 v -3.601426512220159 0.3035013694816535 380.2264145624274 v -3.601426512220159 0.3035013694816535 380.2264145624274 v -2.816188664573911 0.9189580608583623 383.4875928892588 v -2.850599430151993 0.8919874608116971 383.5138897378246 v -1.953047787171403 1.595473883663636 382.8279770811588 v -1.132047395904856 2.238960676795844 384.157985351054 v -1.13204739590466 2.238960676795825 386.17535538369 v 2.563337214725144 5.135343209349358 388.2115307858353 v 1.157450981258178 4.033432377751454 387.4368804399501 v -1.13204739590466 2.238960676795825 382.2005652058629 v -1.483950427786574 1.963144786952158 382.4694909499966 v 2.563337214725144 5.135343209349358 388.2115307858353 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4.372935002265962 5.116005999091474 387.4769882028206 v 5.837218250942213 6.263687464232009 386.7091437756644 v -0.6156026132337016 1.206071111407676 384.0625380529627 v -0.6156026132336699 1.206071111407597 386.1976254558742 v 1.940357259650106 3.209391011704059 387.6059721289286 v -0.6156026132336699 1.206071111407597 382.3946130267142 v -0.9675056451155846 0.9302552215639305 382.6635387708479 v -1.376374386256676 0.6097905325727533 382.9759979442636 v -3.10195354430607 1.4886650521542 383.3809666372145 v -3.520172540151903 2.325103043883317 383.2238259563409 v -2.816843445381475 0.9184448542794791 383.4880932754447 v -2.748254393685888 0.7812667508823458 383.5138647740873 v -2.808783668781085 0.902325301077977 383.4911216380854 v -2.763025166805226 0.8108082971225601 383.5083148364519 v -9.16608054743414 -3.26429935553534 380.4143415623969 v -9.23868372841126 -3.101221441344736 380.4657468965342 v -7.196683524417227 -7.687868053275843 379.0199465695783 v -8.184536663858317 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457 459 f 38 460 455 f 38 329 349 461 460 f 350 343 454 462 f 352 344 456 464 f 351 350 462 463 f 208 342 358 467 466 f 411 368 469 468 f 358 359 470 467 f 349 355 465 461 f 227 226 471 472 f 60 473 474 f 325 215 60 474 475 f 11 224 262 478 477 f 11 477 476 f 228 246 480 479 f 262 431 482 478 f 246 325 475 480 f 368 348 459 469 f 359 411 468 470 f 431 310 481 482 f 485 486 483 484 f 489 490 487 488 f 493 494 491 492 f 497 498 495 496 f 501 502 499 500 f 505 506 503 504 f 509 510 507 508 f 513 514 511 512 f 517 518 515 516 f 521 522 519 520 f 525 526 523 524 f 529 530 527 528 f 533 534 531 532 f 537 538 535 536 f 541 542 539 540 f 545 546 543 544 f 549 550 547 548 f 553 554 551 552 f 557 558 555 556 f 561 562 559 560 f 565 566 563 564 f 569 570 567 568 f 573 574 571 572 f 577 578 575 576 f 581 582 579 580 f 585 586 583 584 f 589 590 587 588 f 593 594 591 592 f 597 598 595 596 f 601 602 599 600 f 605 606 603 604 f 609 610 607 608 f 613 614 611 612 f 617 618 615 616 f 621 622 619 620 f 625 626 623 624 f 629 630 627 628 f 633 634 631 632 f 637 638 635 636 f 641 642 639 640 f 645 646 643 644 f 649 650 647 648 f 653 654 651 652 f 657 658 655 656 f 661 662 659 660 f 665 666 663 664 f 669 670 667 668 f 673 674 671 672 f 677 678 675 676 f 681 682 679 680 f 685 686 683 684 f 689 690 687 688 f 693 694 691 692 f 697 698 695 696 f 701 702 699 700 f 705 706 703 704 f 709 710 707 708 f 713 714 711 712 f 717 718 715 716 f 721 722 719 720 f 725 726 723 724 f 729 730 727 728 f 733 734 731 732 f 737 738 735 736 f 741 742 739 740 f 745 746 743 744 f 749 750 747 748 f 753 754 751 752 f 757 758 755 756 f 761 762 759 760 f 765 766 763 764 f 769 770 767 768 f 773 774 771 772 f 777 778 779 780 775 776 ```

Would be interested in understanding what's happening here,

Thanks in advance

Kiord commented 1 year ago

Polygonal (#vertices>3) meshes are not yet supported in Trimesh : https://github.com/mikedh/trimesh/issues/988#issuecomment-690347848

This may be an interesting feature to add to trimesh (already mentionned in #1459)

You can either :

mikedh commented 1 year ago

Actually for OBJ files it should have triangulated this correctly, I think the check for mixed tri-quad-ngon faces hit an edge case:

if len(array) == (columns * len(face_lines))

There were quads, triangles, and ngons, and the average was exactly 4 (ngons offsetting triangles). I'll see if I can add a better check. I also noticed that one of the n-gons was non-convex which we don't handle (triangle fans):

Screenshot from 2023-03-17 13-02-14

Kiord commented 1 year ago

Ok my bad

esgn commented 1 year ago

Thanks a lot all for the explanation and the quick fix.