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1 Tutorials Rhino 3D Surface Continuity (Part Two) em Qua Jan 26, 2011 1:32 am

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This
is Part 2 of Rhino 3D Tutorial: Surface Continuity. This is an article
pertaining to surface/form modelling for industrial and product design.
[Você precisa estar registrado e conectado para ver este link.]
In Part 1, we have created a curve that is tangent to the edge of
the existing surface. Now, we need to proceed to make the curve G2
(curvature) continuous to the edge.
We can use Match Curve to bring the curve to
curvature (G2) continuity with the adjacent surface edge. Match Curve
is within the Curve Tool panel. Select Continuity as Curvature from the
Match Curve option. Note: For curves that have less than 6 control
points, the curvature at the other end of the curve to match may be
modified. The Preserve other end option prevents this modification.


From the screenshot shown above, we can see that the Curvature Graph
displays a better flow with little or no sudden break or transition.
Next, we can bring up the Adjust Curve End Bulge
tool to fine tune the curve. Make sure that the side (as indicated as 1
in the screenshot below) has Continuity = Curvature at the command
line/prompt. For the other end (indicated as 2 in the screenshot
below), in our case here, Continuity = Position is to be set. This is
because we have only created enough control points for curvature to one
end of the curve.

Once we are satisfied with this curve, we can proceed to create the
other curve to match the other surface edge. Use the same method as
described to ensure curve is curvature-matched to the edge as well. See
illustration below of the other curve.

Now, we can use a surface tool with continuity to create the
surface. In this case here, a new curve is created as shown below. The
control point is turned on to adjust the profile to give it a slight
bulge.

Next, using Surface from Network of curve, create the surface. Remember to set the Edge matching option to Curvature at the Options dialog. In this case, this is indicated as edge D. This is very important as surfaces do not automatically become curvature-matched even though the curves used to create them are.

Use the Zebra tool to evaluate the surface continuity. Zebra strips
can be used to indicate whether surfaces are position, tangent or
curvature to each other. However, we are not going to go into the
details here. Please note that the zebra tool cannot detect higher end
continuity that can be seen by a curvature graph display.

What we have illustrated here is just a simple example. If we have additional adjacent surface edges to match to, the surface from network of curve tool can provide surface continuity matching options for all sides of its boundaries.
Well, that’s all for this article. Thanks for reading
About the Author: Being an industrial designer by
profession, I have done much technical modelling projects for clients
such as Razer and Creative Technology. I am proficient with
Aliasstudio, Pro-Engineer and Rhinoceros 3D.
Disclaimer: We are in no way to be held responsible if the results is not as desired by you.]

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