Dear all,

We are working on a Surface modeller project and we

deal with B-spline surfaces. The following problem

is to be solved and we do not have many good references

to concrete work done in this area.

Problem: Intersection of two B-spline surfaces

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Given two B-spline surfaces (BSS), we want to find

the curve formed by the intersection of the two surfaces.

The representations of the resultant curve may be

piecewise linear curve or composite Bezier curve.

The issues we are struggling with are

i. Algorithm for performing surface X surface intersection

ii. Tolerance measure for distance

iii. Special cases where the boundary of one surface

touches other surface. The word "touches" has some

distance tolerance associated with it.

We are looking for some references to survey papers,

specific work done.

and I'll post a summary of replies.

Thank you.

Dinesh Shikhare

-------------------------------------------------------

National Centre for Software Technology (NCST)

Graphics and CAD Division,

Juhu, Bombay 400049,

INDIA. Phone: +91 (22) 620 1606

Fax : +91 (22) 621 0139

-------------------------------------------------------