Mismatch between projected point and parameter in ShapeAnalysis_Curve::Project

[arjan-schouten]

Description

In this case a point is projected on a wire and the returned projected point is different then the point the returned parameter yields.

Debugging yields that the correct projection and parameter are found in a first attempt. It then tries to find a better solution but it doesn't find one where the distance is less then the first found. It now restores the first found distance and parameter but doesn't restore the first projected point.

See below code

OCCT/src/ShapeAnalysis/ShapeAnalysis_Curve.cxx

Lines 392 to 398 in cc30b93

	if (distmin > aModMin)
	{
	distmin = aModMin;
	param = aModParam;
	}
	return distmin;

Expected Behavior

The returned projection and parameter match.

Actual Behavior

The returned projection and parameter mismatch.

Sample Code or DRAW Tcl Script

	
        BRep_Builder b;
	TopoDS_Shape s;
	BRepTools::Read(s, "c:/temp/wire.brep", b);
	TopoDS_Wire w = TopoDS::Wire(s);

	gp_Pnt pnt(-5.9620395625172007, 188.32957914975418, 232.57973165696146);

	BRepAdaptor_CompCurve CC(w);

	double u;
	gp_Pnt proj1;
	gp_Pnt proj2;
	ShapeAnalysis_Curve SAC;
	double dist = SAC.Project(CC, pnt, Precision::Confusion(), proj1, u);

	proj1 = proj1;		 // { coord = { x = -1.9750867608081535e-13 y = 191.32747039960771 z = 218.59562912027135 } }
	proj2 = CC.Value(u); // { coord = { x = -4.8094037238747411 y = 191.50444073117907 z = 218.44060528320776 } }

Operating System

Windows

Compiler

MSVC

Bitness

64-bit

OCCT Version

latest

Additional Files

No response

[arjan-schouten]

I don't seem to be able to add the brep file that reproduces the problem. It says that .brep is not allowed.

[arjan-schouten]

wire.zip

[dpasukhi]

Thank you for the detailed report!