**Definition**:

f(x) is analytical convolution for a triangle with Cauchy kernel [McCormack and Sherstyuk 1998]

r - distance to a skeleton point

**Call**: hfConvTriangle(x,vect,S,T);

**Parameters**:

x - point coordinates

vect - coordinate array for vertices of triangles (9 elements for each)

S - array of kernel width control parameters for each triangle

T - threshold

**Test file**: convtri.hf