fontys academy of architecture, tilburg giulio piacentino 2008 [email protected] doubly...
TRANSCRIPT
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FONTYS ACADEMY of ARCHITECTURE, TILBURG
Giulio Piacentino [email protected]
DOUBLY CURVEDSURFACES MODELING
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PROJECT WORKFLOWsoftware used in current architectural discourse
MESH MESH
NURBS, MESH, SUBDIVS
POINTS, LINES, MESH
MESH,NURBS
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Nov 28 Dec 5
morning
afternoon
2D/3Dinterfacepatternscurves
Complex surfacesmanipulatesolids
WORKSHOP SCHEDULE
surfacesconstruction
Intro,paper model
your project help withchoices
Solidsmodeling
morning
afternoon
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Before we start:
feel free to stop me whenever you feel it is necessary or you don’t have everything clear!
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THE RHINO INTRO
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INTERFACE
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INTERFACE
You can give instructions to Rhino by: menu items, command line and buttons.
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For architectural practice:
use the meter modelspace
with small objects (recommanded),
or the centimeter modelspace with large
objs.
Thirdly, mm (large).
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INTERFACEConstruction planes (Cplane) are view-dependent (one in each window)
GLOBAL: symbols
LOCAL: X is RED and Y is GREEN Z through right-hand rule
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SHORTCUTS
F1 (help)
F2 (commandHistory )
F3 (properties)
F6 (show camera)
F8 (ortho)
F10 (pointsOn)
F11 (pointsOff)
Alt -temporarily disable oSnap-copy object instead of dragCtrl-elevator mode
Shift-temporarily toggle ortho
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GEOMETRICALBASICS
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POINTS AND LINES
points and straight lines are the easiest set of objects in rhino
points can be grouped into pointClouds
lines can be joined into polylines. polylines are still MANY lines.
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POINTS AND LINES
pointGrid
points
pointCloud
point drapePt
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POINTS
When you give coordinates , you can add an r to make the coordinate relative to the last given point.
0,0,00,0,10 0,0,20 0,0,30
0,0,0r0,0,10 r0,0,10 r0,0,10
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CURVES
curves are renders of mathematical equationscurves in rhino are NURBS curves (Non-Uniform Rational B-Splines)
they have: a degree
they have: control points
they have: weights
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CURVES
draw 3 or more curves with the same control points and different degrees.
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CURVES
you get a straight line after… as many points edit point in a row as the degree of the curve.
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CURVES
If we use any third degree NURBS curve, and we modify any set of points,the first curve segment to coincide again will be the one between the 2nd-last and the 3rd last modified point. After that, all will coincide again.
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CURVES
If the curve has kinks, you can explode it into smaller parts
Otherwise you can divide it with split
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CURVES
You can join them back together, with Join, but they will be transformed into polyLines and polyCurves (depending on the degree).
Try the command Properties to inspect the outcome.
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CURVES
In some situations we may need to rebuild these polycurves, so that they can return to be a single entity.
A similar command to try is also rebuildCrvNonUniform.
Both these commands reconstruct selected curves or surfaces to a specified degree and with a specified number of control points.
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CURVES
Not always it is easy to rebuild a curve to something similar, if we don’t add many more points.
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IN A INSTANT
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SURFACES
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SURFACES
besides points and curves, NURBS surfaces are the basics of geometry in Rhino and can be used to draw both flat things and objects
An isoparametric curve (isocurve) is a curve of constant u- or v-value on a surface. Rhino uses isocurves and surface edge curves to visualize the shape of a NURBS surface. By default isocurves are drawn at knot locations. If the surface is a single knot-span surface like a simple rectangular plane, isocurves are drawn also in the middle of the surface.
isocu
rve
edge
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SURFACES
NURBS are inherently rectangular (U / V)
uv
also surfaces can be rebuilt.
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SURFACES
some of these commands create singular surfaces
Platonic solids and regular surfaces
default.solid toolbar
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SURFACES
curvature analysis of some singular NURBS surfaces
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SURFACES
zebra (to visualize position, tangency and curvature continuity)write help for more information about it
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SURFACES
solids always have the normal toward the interior.dir (to visualize and change direction of orientation), with crvs & srfsflip directly turns the direction of crvs and srfs.
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SrfPtcorner points
ExtrudeCrvone curveand (one size)*
SURFACES
EdgeSrf2,3,4 edgecurves
* More options of input are available
Sweep1rail (crv)profile (crv)
Loftsections(curves)
BlendSrftwosurfaces
Sweep2rail 1 (crv)rail 2 (crv) profile (crv)
Revolveprofile (crv)axis (2 pts)RailRevolverail (curveprofile ) (crv axis)
10 basic methods of surface creation in Rhino
NetworkSrf4 or morecrvs
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SURFACES
trim will cut the surface. But the control points remain.
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SURFACES
splitting along an isocurve will also automatically shrink the surface.
in some exceptional cases, we can use the command shrinkTrimmedSrf.
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TRANSFORM TOOLS
If you are familiar with any modeling software, you’ll find out thatyou can guess what each of these buttons will do.
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VARIOUS OTHERS
in the next exercises you might find also the following other commandsuseful:
- divide a curve- offset a curve
- project (parallel) onto a surface- pull a curve onto a surface
- extrudeSrf to solidify a surface (straight movement) - offsetSrf to solidify a surface (parallel movement)
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A MODEL
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which rules can you use?
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which rules can you use?
make lines, extrude,solidify
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FIND YOUR WAY
bent, twisted, cut
Your paper model
Your 3Dmodel
bend!, twist!, trim!
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PROJECTS WITH RHINO
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PROJECTS WITH RHINO RYOKO IKEDA
Social facilitation building in New York
Graduation Project Border Condition 2008
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Copyright Giulio Piacentino 2008
All rights reserved. The author may grant a different license in writing.