When building a developable surface, you can get very different results depending on the complexity and similarity of the two edge curves. They were not designed to be used for bending and unfolding sheet metal like duct work or for developing fabric patterns. These developable surface tools work best for designing airfoil and hydrofoil type surfaces. You can use Gaussian curvature analysis to determine which areas of a surface are not developable. Curves of similar shape without kinks work best. Since developable surfaces cannot be created from just any two curves, results from a developable style loft can be unpredictable. If the surface is not linear in one direction, Rhino will not be able to unroll the surface. If the Gaussian curvature is not zero, Rhino will not be able to unroll the surface. Examples of this type of shape are cylinders, cones, and some steel ship hulls.īecause these surfaces are linear in one direction, the Gaussian curvature is zero at every point on the surface. Rhino has commands to create and unroll developable surfaces with holes and marking curves.ĭevelopable surfaces are surfaces that can be formed by rolling a flat sheet of material such that the material does not stretch, tear, or wrinkle. If the line is 100 units long, max deviation is compared to 1. 01, the maximum deviation is compared to 0.1. If a curve is 10 units long and the relative tolerance is. Select the edges that should be open after unrolling.ĭetermines whether or not matching numbered dots are placed on the edges of the selected object and the resulting objects.ĭetermines whether or not the selected object's properties are copied to the resulting object.Ĭompares the maximum deviation of a curve from a line between its endpoints to the Relative Tolerance * length of the curve. To specify where the unrolled polysurface will split 1.
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