usage of profile in FCF of PCDIMS V44B

huangyhg

When the line2 (upper segment) dimension is line profile, the feature list should not include the 3D features such as F_PLANE, F_SPHERE, F_CYLINDER, and F_CONE. The line3 (lower segment) dimension list must not include surface profile since the upper segment is line profile. The line3 (lower segment) must include line profile.



When the line2 (upper segment) dimension is surface profile, the feature list should not include the 2D features such as F_LINE, F_CIRCLE, F_SLOT, F_POLYGON, F_ELLIPSE. The line3 (lower segment) dimension list should not include line profile since the upper segment is surface profile. The line3 (lower segment) must include surface profile.



Generally users do not use prismatic features (lines, circles, planes, spheres, and so on) when doing profile dimensions. Usually they construct a set from a scan which may be 2D or 3D, so constructed sets must always be in the feature list for both line and surface profile. It is the responsibility of the user to know which type of profile applies. If a user constructs a curve (F_CURVE) from a scan, this is a 2D feature so only line profile would apply. If a user constructs a surface (F_SURFACE) from a scan, this is a 3D feature so only surface profile would apply.