| 摘要 |
A coordinate system R is set in which P<SUB>0 </SUB>is a coordinate origin, P<SUB>0</SUB>P<SUB>1 </SUB>conforms to a first U axis to have a unit length, P<SUB>0</SUB>P<SUB>2 </SUB>conforms to a second V axis to have a unit length, and P<SUB>0</SUB>P<SUB>1</SUB>xP<SUB>0</SUB>P<SUB>2 </SUB>is a unit vector conforming to a third N axis. A transforming matrix M that transforms an ordinary coordinate system into the coordinate system R and the u-, v- and n-coordinate values of the both ends of the line segment are calculated. It is determined whether or not the line segment intersects with the triangle, on the basis of the u-, v- and n-coordinate values. The u-, and v-coordinate values of the intersection point are calculated. It is determined whether or not the intersection point is positioned inside the triangle, on the basis of the u-, and v-coordinate values of the intersection point.
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