René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Triangle can't be solved with two angles and one distance constraint","articleBody":"Hi, I'm playing around with `python-solvespace` and it's great so far - thanks! One problem I found though is that it can't seem to solve the following file:\r\n\r\n```python\r\n# adapted from https://github.com/KmolYuan/python-solvespace/blob/master/example/PyDemo.py\r\n\r\nfrom slvs import *\r\n\r\nsys = System()\r\n\r\n# origin Point zero\r\np0 = sys.add_param(0.0)\r\np1 = sys.add_param(0.0)\r\np2 = sys.add_param(0.0)\r\nPoint0 = Point3d(p0, p1, p2)\r\n\r\n# create normal vector\r\n# quaternion represents a plane through the origin\r\nqw, qx, qy, qz = Slvs_MakeQuaternion(1, 0, 0, 0, 1, 0)\r\np3 = sys.add_param(qw)\r\np4 = sys.add_param(qx)\r\np5 = sys.add_param(qy)\r\np6 = sys.add_param(qz)\r\nNormal1 = Normal3d(p3, p4, p5, p6)\r\n\r\n# create workplane (a plane to draw 2D points on), defined by\r\n# the origin point and the normal vector\r\nWorkplane1 = Workplane(Point0, Normal1)\r\n\r\n\r\n###\r\n# triangle\r\n\r\np7 = sys.add_param(-22.92)\r\np8 = sys.add_param(-6.77)\r\nPoint1 = Point2d(Workplane1, p7, p8)\r\n\r\np9 = sys.add_param(25.55)\r\np10 = sys.add_param(-19.02)\r\nPoint2 = Point2d(Workplane1, p9, p10)\r\n\r\np11 = sys.add_param(25.55)\r\np12 = sys.add_param(-19.02)\r\nPoint3 = Point2d(Workplane1, p11, p12)\r\n\r\np13 = sys.add_param(11.92)\r\np14 = sys.add_param(29.07)\r\nPoint4 = Point2d(Workplane1, p13, p14)\r\n\r\np15 = sys.add_param(11.92)\r\np16 = sys.add_param(29.07)\r\nPoint5 = Point2d(Workplane1, p15, p16)\r\n\r\np17 = sys.add_param(-22.92)\r\np18 = sys.add_param(-6.77)\r\nPoint6 = Point2d(Workplane1, p17, p18)\r\n\r\nLine1 = LineSegment2d(Workplane1, Point1, Point2)\r\nLine2 = LineSegment2d(Workplane1, Point3, Point4)\r\nLine3 = LineSegment2d(Workplane1, Point5, Point6)\r\n\r\n# constrain edges of lines at each vertex to be coincident\r\nConstraint.on(Workplane1, Point1, Point6)\r\nConstraint.on(Workplane1, Point2, Point3)\r\nConstraint.on(Workplane1, Point4, Point5)\r\n\r\n# set one side length and two angles\r\nConstraint.distance(50, Workplane1, Point1, Point2)\r\nConstraint.angle(Workplane1, 60, Line1, Line2)\r\nConstraint.angle(Workplane1, 60, Line2, Line3)\r\n\r\n# alternatively, set two distances and one angle\r\n#Constraint.distance(50, Workplane1, Point1, Point2)\r\n#Constraint.distance(50, Workplane1, Point3, Point4)\r\n#Constraint.angle(Workplane1, 60, Line2, Line3)\r\n\r\nsys.calculateFaileds = 1\r\nsys.solve()\r\nresult = sys.result\r\n\r\nif result == SLVS_RESULT_OKAY:\r\n    print(\"OK\")\r\nelif result == SLVS_RESULT_INCONSISTENT:\r\n    print(\"solve failed\")\r\n    print(\"SLVS_RESULT_INCONSISTENT\")\r\nelif result == SLVS_RESULT_DIDNT_CONVERGE:\r\n    print(\"solve failed\")\r\n    print(\"SLVS_RESULT_DIDNT_CONVERGE\")\r\nelif result == SLVS_RESULT_TOO_MANY_UNKNOWNS:\r\n    print(\"solve failed\")\r\n    print(\"SLVS_RESULT_TOO_MANY_UNKNOWNS\")\r\n\r\nprint(\"{} DOF\".format(sys.dof))\r\n```\r\n\r\nThis is a triangle with two constrained angles and one constrained length, and should therefore be fully constrained. Instead, I get the error \"SLVS_RESULT_DIDNT_CONVERGE\". In the SolveSpace GUI it is able to solve this as \"OK\".\r\n\r\nInterestingly, setting two distance constraints and one angle constraint seems to work ok.\r\n\r\nDo you have any idea what is wrong?","author":{"url":"https://github.com/SeanDS","@type":"Person","name":"SeanDS"},"datePublished":"2018-09-12T09:24:53.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/4/python-solvespace/issues/4"}