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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
Why is surface modeling important?
  • Many products, although they look prismatic, are not.
curvature
Curvature
  • Visual difference between curvature vs. tangent connection of surfaces

Regular Fillet

Curve Continuous Fillet

explanation of c0 thru c3
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

advanced modeling 101
Advanced Modeling 101
  • Importance of visible connection

No “Radii” used; all C2 connection of surfaces

C0 CONDITION

(Contact)

C1 CONDITION

(Tangency)

C2 CONDITION

(Continuity)

advanced modeling 1015
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

advanced modeling 1016
Advanced Modeling 101
  • Bad Curves make bad surfaces

Visible surface change

Profile made up of arc segments

advanced modeling 1017
Advanced Modeling 101
  • Good Curves make good surfaces

No visible surface change

Single spline element

advanced modeling 1018
Advanced Modeling 101

Fit Spline Function Tolerance

Fit Spline = C2

Low Tolerance

Manually Placed Spline = C2

Fit Spline = C2

Hi Tolerance

5 arcs = C1

advanced modeling 1019
Advanced Modeling 101

Curvature Comb – analysis tool to graphically emphasize rate of curvature

Rate of Curvature Changes

Point of Inflection

Curvature approaches zero

advanced modeling 10110
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

why surfacing modeling instead of solid modeling
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