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(continued...) Projected curves can be assigned draft for moulding and casting applications.
Equivalent surface types include B-spline and C-spline lofted surfaces determined by whether the surface passes through all of the control curves, mirrored, offset, swept and revolution surfaces.
A blend surface allows two surfaces to be smoothly blended with G1 or G2 tangency.
G0 describes curves that join at an arbitrary angle and therefore have no tangency.
When curves have the same direction at the junction but dissimilar curvature such as a line tangent to an arc, G1 continuity exists.
The smoothest and most aesthetically pleasing tangency is G2 where in addition to the same direction the curves also have the same curvature at the junction.
This is commonly described as set back in applications such as casings to avoid harsh highlights where flat surfaces must transition into edge radii.
Although the required design principles must be understood in order to efficiently construct geometry capturing the design intent, surface curvature tools are available to analyse the end result.
The capture of intelligence during entity creation facilitates editing flexibility.
This combination of geometric entities and the relationships between them AeroHydro describe as Relational Geometry.