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A4.20: Feature Washout: Patch Layout Analysis

This tutorial describes how to create a smooth transition between surfaces to fade out a sharp wheel arch feature on a vehicle model. It discusses analyzing the mesh curvature, sketching the patch layout, and using square surfaces with explicit control and boundary blending to fill the gap and achieve the necessary continuity. Close attention is paid to fine-tuning the control vertex layout to create the highest quality result.

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Attila
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48 views2 pages

A4.20: Feature Washout: Patch Layout Analysis

This tutorial describes how to create a smooth transition between surfaces to fade out a sharp wheel arch feature on a vehicle model. It discusses analyzing the mesh curvature, sketching the patch layout, and using square surfaces with explicit control and boundary blending to fill the gap and achieve the necessary continuity. Close attention is paid to fine-tuning the control vertex layout to create the highest quality result.

Uploaded by

Attila
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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A4.

20: Feature Washout


This tutorial describes the patch layout to fade out a sharp
feature on a wheelach/fender model.

Patch Layout Analysis


In the first part of the tutorial Barry discusses his approach to
working out a patch layout.

Model Provided
You are given the base set of surfaces, with G2 continuity
created to create the smooth transitions either side of the sharp
edge. This leaves a discrepancy around the wheelarch that
needs to be fixed.

Close Attention to CV Layout


Building with a simple Square surface fills the gap, but more
attention is paid to fine-tuning the CV layout to create the best
quality result.

Note: Definition of an Ogee


An ogee is a verbal version of zero curvature (o for zero and
g for curvature). It simply refers to an inflection, where a curve
or surface goes from positive to negative.

TUTORIAL 4.20 FEATURE WASHOUT - WHEELARCH | Index


INDEX
Time Topic Menu/Palette Tool Options
0.34 Analysing a scan to work out the patch layout
1.37 Using the Curvature Evaluation shader to analyse the mesh Diagnostic Shading Curvature Evaluation Principal Max
2.02 Sketching the patch layout
5.38 Discussing the fade out transition area
6.36 Analysis of the fade-out feature from a different view
8.06 Working on the surfaces Laying out the patches with curves Curves > New Curves New Edit Point Curve Degree 1
9.16 Splitting up the curves to create a patch outline Curve Edit Curve Section
9.33 Project the curves onto the central blend surface Surface Edit > Create New CoS Project Normal
9.49 Create the first Square surface to blend out the wheel arch Surfaces > Boundary Surfaces Square
10.34 Using Explicit Control to create a Bezier surface Surfaces > Boundary Surfaces Square Explicit Control
10.51 Increasing to degree 6 to achieve continuity
Analysing CV flow and discussing the free row of CVs not controlled
11.00
by the G2 constraints at the boundaries
11.18 Analysing CV flow with viewing View Cube menu Non-Proportional View
11.26 Analysing surface with curvature combs Control Panel > Display Curvature U
11.49 Adjusting the central, free row of CVs using boundary blend in Square Surfaces > Boundary Surfaces Square Boundary Blend
12.44 Using Curvature evaluation shader to check the surface quality Diagnostic Shading Curvature Evaluation Mean
14.39 Create the second Square surface Surfaces > Boundary Surfaces Square
15.23 Deleting the CoS and using Align > Project to fix continuity Object Edit > Align Align Project
16.05 Final diagnostics Diagnostic Shading Iso Angle
17.25 Final refinements of CV positions on the first square surface
18.42 Using Tangency G1 to evaluate a G0 positional edge Evaluation > Continuity Surface Continuity G1

TUTORIAL 4.20 FEATURE WASHOUT - WHEELARCH | Index

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