T-SplineRing.pdf

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Organic Modeling for Jewelry
®
Design with T-Splines and Rhino 4
Designing a Ring
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 organic models for jewelry
design.
The best way to read this tutorial about how to model a ring using T-Splines is by looking at
the 3D model at the same time. You can follow the model’s progress by selecting the differ-
ents layers in the file. The 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
Wireframe
Ring Profile
First, draw the main profile of the ring using
Curve.
For me, the best way to get the right pro-
file is by designing it undeveloped.
This particular design consists of two hearts connected by the body of the ring. The idea is to
have a smooth transition between the body and the hearts, with no sharp edges.
PAGE 2
T•Splines
2
Wireframe
Use
ExtractControlPolygon
to extract
the control polygons of the curves.
In step 5, you will use this control poly-
gon to generate a T-Splines surface with
the same profile as the native curves.
Control Polygon
3
Wireframe
Once you have the control polygon
profile, you need to connect the points.
Remember that the ideal thing is to
have rectangular regions (keep that rule
of thumb in mind when you draw the
curves).
Each line intersection will determine
where the control points will be on the
surface.
Inner Lines
PAGE 3
T•Splines
4
Wireframe
Delete these lines
Extrude Lines
Now, extrude these lines with
tsScriptExtrudeControlPolygon
(Thanks JB and T-Splines for
this amazing tool!) in order to get a 3D control polygon.
Remember to delete all the internal lines after extruding. These inner lines are not necessary
for the
tsControlPolygonToSrf
command (next step).
5
T-Splines surface
Before generating the T-Splines sur-
face, make sure you only have the lines
you need; for this, I usually use: first,
ungroup
all, then split selected curves
against each other (tsSplitCurves),
select duplicate curves (SelDup) and
Delete
them.
Now the curves are ready to be trans-
formed to a T-Splines surface.
Select all lines and enter the
tsControl-
PolygonToSrf
command.
Transform to T-Splines Surface
PAGE 4
T•Splines
Check the preview option to ensure the surface is correct. Now the T-Splines surface is cre-
ated.
6
T-Splines modification
Body Profile
To get the desired body profile, make some changes by moving control points using
tsManip.
First, scale -X (in the negative “X” direction) the twelve selected points shown on the screen-
shot. Scaling points is a way of moving them symmetrically.
Second, move these same points -Z in order to get a smoother curvature on the outside part
of the ring body.
Scale -X
Move -z
PAGE 5
T•Splines

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