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Every point on a surface defines a single Darboux frame comprising the surface normal and the two vectors of principal curvature. This is sufficient information to place and size spine-like objects on the surface. The point provides location, the surface normal provides the direction for the top of the spine and the vectors of principal curvature provide information for further adapting the spine to context.      ... more on Design Patterns CA

PlHoHedgehog Manipulations

PlHoHedgehog Manipulations

PlHoHedgehog Manipulations