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Normal of a triangle

Anonymous's picture
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Hi

I have a problem to obtain the normal of a triangle (or a face)

Here is a litle example of what i did:

1/ I define a Face which have 3 vertices A:(0,0,0) B:(1,0,0) and C(1,1,0) 2/ I try to obtain U,V parameters with GeomAPI_ProjectPointOnSurf

the projectio of A gave me U=-1 V=0 and the projection of C gave me U=0 V=1 3/ I try to obtain the normal of the face by using BRepAdaptator_Surface BAS(myTrg); BRepLProp_SLProps (BAS,U,V,0,0);

When I asked the normal with U,V of C , the return was the right answers but when I ask the normal with U,V from A the function returned NAN,NAN,NAN ?

Have you an idea ? xav