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Why is surface modeling important?

Why is surface modeling important?. Many products, although they look prismatic, are not. Curvature. Visual difference between curvature vs. tangent connection of surfaces. Regular Fillet. Curve Continuous Fillet. Explanation of C0 thru C3. Surface matching conditions explained.

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Why is surface modeling important?

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

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

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

  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)

  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

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

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

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

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

  10. Advanced Modeling 101 • Display analysis visualization tools No “Radii” used; all C2 connection of surfaces OpenGL Curvature RealView PhotoWorks Zebra Face Curves Section w/ Combs Deviation Analysis

  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 Not Design Intent

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