View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0031605 | Community | OCCT:Foundation Classes | public | 2020-06-10 11:42 | 2020-06-10 11:42 |
| Reporter | aothms | Assigned To | |||
| Priority | normal | Severity | minor | ||
| Status | new | Resolution | open | ||
| Summary | 0031605: gp_GTrsf::SetVectorialPart sets scale to 0.0 causing non-invertable matrix | ||||
| Description | I sometimes get a 4x4 matrix from external sources that I want to convert to a shape location. So I use gp_GTrsf, check form, convert to gp_Trsf and TopLoc_Location. The most straightforward way to do this is to use gp_GTrsf::SetVectorialPart(), but that sets the internal scale value to 0.0. I don't think this is necessary: there is code in OCCT to calculate scale from the gp_Mat I think and I also don't know why gp_GTrsf carries a single scale value as it allows non-uniform scale. I'd happily provide a fix if I get some guidance on the most desirable way to address this. | ||||
| Steps To Reproduce | Execute the code below and witness an exception in gp_Trsf::Invert() --------------- #include <gp_Mat.hxx> #include <gp_GTrsf.hxx> #include <TopLoc_Location.hxx> #include <BRep_Tool.hxx> #include <BRepBuilderAPI_MakeFace.hxx> #include <gp_Pln.hxx> #include <TopoDS_Face.hxx> #include <TopExp_Explorer.hxx> #include <TopoDS.hxx> #include <TopoDS_Edge.hxx> int main(int, char**) { gp_Mat mat(gp::DX().XYZ(), gp::DY().XYZ(), gp::DZ().XYZ()); gp_GTrsf trsf; trsf.SetVectorialPart(mat); trsf.SetForm(); TopLoc_Location loc(trsf.Trsf()); TopoDS_Face f = BRepBuilderAPI_MakeFace(gp_Pln(), 0.1, 0.1, 0.2, 0.2).Face(); f.Move(loc); TopExp_Explorer exp(f, TopAbs_EDGE); TopoDS_Edge e = TopoDS::Edge(exp.Current()); double u0, u1; BRep_Tool::CurveOnSurface(e, f, u0, u1); } -------------- | ||||
| Tags | No tags attached. | ||||
| Test case number | |||||
