T-SplinesEarring.pdf

(16347 KB) Pobierz
Organic Modeling for Jewelry
®
Design with T-Splines and Rhino 4
Designing an Earring
Juan Santocono
Industrial Design
Universidad de Buenos Aires, Argentine
Matt Sederberg
T-Splines, Inc.
© Copyright 2008 T-Splines, Inc.
PAGE 1
Designing freeform objects can be difficult when working with traditional CAD software.
T-Splines
and
Rhino 4
offer an easy way to create smooth, gap-free freeform models for
jewelry design.
The best way to read this tutorial about how to model a earring using T-Splines is by look-
ing at the 3D model at the same time. You can follow the model’s progress by selecting the
differents layers in the file. T-Splines for Rhino must also be installed on your computer. Both
T-Splines for Rhino and the earring model can be downloaded at www.tsplines.com.
In this tutorial, anything in
Blue
is a Rhino command, while anything in
Red
is a T-Splines
command. Type these commands in the command line of Rhino to run them.
1
Mesh
To get the general shape of the earring,
create a
Meshtorus,
with VerticalFaces=8
and AroundFaces=16, Radius=10,
Second Radius=4.
Creating the base mesh
Mesh
2
T-Spline surface
Convert the mesh torus to a T-Spline
surface. Use
tsConvert
and select the
mesh to perform the conversion. The T-
Spline torus has the same control points
as the mesh torus.
Converting the mesh
T-Spline surface
PAGE 2
T•Splines
3
T-Spline modification
Extruding faces
The earring design is a sun, so the sun rays need to be created. There will be some long rays
and some short rays.
Create the long rays first. To make these, extrude some faces with
tsExtrude.
1-Extrude selected fa-
ces (yellow) as shown,
about 3 units.
1
2-In order to get flat rows
of control points for the
next extrusions, flatten
the selected points. Use
tsScriptFlattenPoints.
Do
this with each of the 4 ray
tips separately.
Flattened points
2
3-Extrude the flattened
faces again (tsExtrude).
3
4
4-Extrude them again.
5
Flattened rows of
control points
5-Extrude them twice more (a total of four extru-
sions). This will give you sufficient control points
to add details to the rays.
PAGE 3
T•Splines
4
T-Splines adjustments
Modifying side profile
Now, shape the sun rays by using the
FlowAlongCurve
command on the T-Spline con-
trol points. First, you need to draw a couple of curves, the base curves (the ones that pass
through the control points) and the target curves (these ones represent the new profile).
1
Base curve
2
3
Target curve
2-Use
FlowAlongCurve
on all
1-Draw the base and target
curves for both sides of the sun the left-side control points.
rays.
3-Use
FlowAlongCurve
on
all the right-side control
points.
5
T-Splines adjustments
Modifying front profile
To modify the front profile you will do something similar to the previous step, but (for the
sake of introducing an alternative workflow) instead of using the flow command, do it manu-
ally. First, draw some reference curves.
1
Rows of
points
2
Moving and
scaling to
match the
curve
3
1-Select the bottom row of
control points (shown) and use
tsManip
(scale and move) to
match the surface profile to the
curves.
2-Repeat this process with 3-Now you have the shape
you want on one sun ray.
the four rows of control
points. This manual method
can give a decently accurate
surface.
PAGE 4
T•Splines
6
T-Splines adjustments
Modifying details
Now some further adjustments are necessary. First, use
tsManip
to scale (+Y) all the center
ray control points to give a concave curvature to the sun rays. Remember to select all the
center points of the four rows on each side. Second, using
tsManip,
scale these four points on
the tip to get a smoother tip.
1
2
1-Scale center control points +Y.
2-Scale tip control points -X.
7
T-Spline adjustments
Copying the rays
One sun ray shape is completed, now you need to shape the others. The design intent is that
all four rays should have the same form, so you will copy the first sun ray shape to the other
three rays. Doing this manually would be slow and imperfect. For this reason, use the follow-
ing method, which assures the exact same shape on all the rays.
T-Splines
control points
extracted.
1
1-Select all the control points of the shaped
ray.
2-Use
ExtractPt
to make a point from each
control point.
3-Draw a
Polyline,
snapping to each row of
points. This represents the control polygon
of the ray surface. Connecting the points
is not strictly necessary, but is useful to
give a visual understanding of the control
polygon.
PAGE 5
2
Control polygons
of each row
3
T•Splines

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika:

Zgłoś jeśli naruszono regulamin