| Author |
Message |
    
Dan (designd)
| | Posted on Sunday, May 26, 2002 - 11:57 am: | 
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Bembo chair tutorial
1- Construct a COMPOSITE CURVE
2- Use that curve to generate a SMOOTH REVOLEVED OBJECT
Now we have the basic structure for the chair, the next steps will be to build an object that we will later use to cut of this object the Bembo chair.
3- construct a large smooth Sphere
this Sphere will later generate the cushion like seat shape
4- draw a curve
5- construct a Cylinder or any other shape that is bigger then the revolved object and BOOLEAN DIFFERENCE the Sphere from the Cylinder.
then TRIM AND STITCH it with the curve from step 4
6- Use the SINGLE PARALLEL tool (in 15mm) (keep) on the revolved object
Bring back from the ghosts, the large Sphere. DIFFERENCE it from the offset object
7- BOOLEAN UNION the tow objects (from steps 5 and 6)
8- DIFFERENCE this object (step 7) from the Revolved object (step 2)
all that is left now is to round the edges and that's it
9- 
10- 
11- 
12- now just add the base, another revolved object and we're done.
Dan |
Rod McCormick (rod)
| | Posted on Sunday, May 26, 2002 - 01:09 pm: |
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Dan,
Beautiful job! The only comment I have is that including dimensions at the start (height and width of a box to contain original composite curve would be easy) would make it possible for users to make use of the rounding values you include later in the tutorial. Thanks for your generosity.
Rod |
Dan (designd)
| | Posted on Sunday, May 26, 2002 - 01:43 pm: |
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Sorry I forgot
the height of the composite curve is 780mm and the width 266mm
dan |
simon lee clarke (simonclarke)
| | Posted on Sunday, May 26, 2002 - 07:07 pm: |
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Superb thanks so much.
Simon |
support@formZ.com (tech)
| | Posted on Tuesday, May 28, 2002 - 05:58 pm: |
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Dan,
Thanks for your tutorial. It has obviously helped out some of our users.
We would have perhaps approached this a little differently, so here is a variation on the Bombo chair tutorial:
First, draw a spline shape as shown below:
Next, Mirror a copy (using the Grid Snap to be accurate):
Generate a Nurbz by Boundary from these curves with Use Curve Degree selected, and the Length degree = 2 and the Depth degree = 1:
Edit the Nurbz surface to define the curve in Z (height) from the "Front" view:
Query, Edit, and change the Depth degree to 2. (This adds an additional depth control line between the original 2.) Edit the new control points to define the curve for the seat:
Query, Edit, and change the Depth degree to 3 to add another control line. Again Edit the new control points to further define the curve for the seat:
Here is this object again from the "Front" view
Copy your object, and derive the boundary of your shape with the 2d Derivative tool and the Boundary of Surface Object Option.
Draw some additional circles,
and move them to their appropriate height:
Make sure that their first points and directions are all aligned, and Generate a Nurbz Loft between these lines:
After the shape is Lofted, the Control Points can be further Edited as desired.
Paste in the chair surface:
Draw a profile to revolve for the base:
and Revolve it:
Finally, assign some colors and render:
Here is the model with the steps separated into layers.
ZWebTech Support |
support@formZ.com (tech)
| | Posted on Tuesday, May 28, 2002 - 06:01 pm: |
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And, of course if you forget to attach the file, you need to attach it in another post:
ZwebTech Support |
Dan (designd)
| | Posted on Tuesday, May 28, 2002 - 06:12 pm: |
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Thanks Z
I couldn't upload my file because it's to big , even after zipping it.
I think that the techniqe you demonstrated is not possible in formz 3.8.1, but it is a very cool way of modeling.
Dan |
Dan Shear (redrngr)
| | Posted on Tuesday, May 28, 2002 - 09:39 pm: |
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Dan,
You are correct. NurbZ by Boundry was part of the formZ 3.9 release as well as support for Editing of Trimmed Nurbz surfaces that maintain their controls after editing (Only when trimming process results in a Nurbz surface that consists of a single face. Example, trimming a nurbz surface with a line). The Extract Tool is really great also. 3.9 is a Great update Yet, can't wait until formZ 4.0 is released!
Fine job on the tutorial.
Dan S. |
clauser
| | Posted on Monday, February 09, 2004 - 02:36 pm: |
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I am having a bit of trouble completeing the tutorial. I am currently using version 4.05 educational and am unable to use the nurbz by boundary. I am prompted to select 4 control lines but, as in the tutorial, I have created 2 splines by mirroring. My length and degree are set as shown in the tutorial. Any thoughts would be great. Eric C. |
Dan (designd)
| | Posted on Monday, February 09, 2004 - 03:22 pm: |
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You need to pre-pick the Two curves before picking the NURBZ tool.
Dan |
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Bombo