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Published byNancy States Modified about 1 year ago

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1 Why is surface modeling important? Many products, although they look prismatic, are not.

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2 Curvature Visual difference between curvature vs. tangent connection of surfaces Regular Fillet Curve Continuous Fillet

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3 Explanation of C0 thru C3 C0 Condition – Surface boundaries share Common edge but no tangency C1 Condition – Surface boundaries share Common edge with tangency but rate of curvature does not match at boundary C2 Condition – Surface boundaries share Common edge with curvature matching C3 Condition – Surface boundaries share Common edge with curvature matching to greater degree than C2 Surface matching conditions explained

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4 Advanced Modeling 101 Importance of visible connection No “Radii” used; all C2 connection of surfaces C0 CONDITION (Contact) C1 CONDITION (Tangency) C2 CONDITION (Continuity)

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5 Advanced Modeling 101 Importance of C2: automotive does not use C1 (Fillets) because of visible result on high-gloss surfaces. No “Radii” used; all C2 connection of surfaces

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6 Advanced Modeling 101 Bad Curves make bad surfaces Visible surface change Profile made up of arc segments

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7 Advanced Modeling 101 Good Curves make good surfaces No visible surface change Single spline element

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8 Advanced Modeling 101 Fit Spline Function Tolerance 5 arcs = C1 Fit Spline = C2 Low Tolerance Fit Spline = C2 Hi Tolerance Manually Placed Spline = C2

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9 Advanced Modeling 101 Curvature Comb – analysis tool to graphically emphasize rate of curvature Curvature approaches zero Rate of Curvature Changes Point of Inflection

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10 Advanced Modeling 101 Display analysis visualization tools No “Radii” used; all C2 connection of surfaces OpenGL CurvatureRealViewPhotoWorks Zebra Face CurvesSection w/ CombsDeviation Analysis

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11 Why surfacing modeling instead of solid modeling Solid modeling approach verses Surface Modeling approach Can not be accomplished in one or a few solid features Radii features will not do; need curve continuous surface connections Needs to look and feel like one contiguous form

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