Blender (jusqu'à 2.49)
Nurbs and Bezier
carry out a Celtic knot
Nurbs and Bezier, to design a 3D celtic
the best orientation to start
1/ At the beginning, check that
you are in the ortho/ top view :
2/ Recenter the view and the 3D
cursor with Alt-CKEY
3/ Add a NURBS or Bézier curve
(no matter what the type it is) :
The choice of the circle is arbitrary,
you can take a free curve as well and add as many vertices/nodes as you
want. With an already built form, you gain a little time and avoid
the process of looping with CKEY .
4/ We have to select all the nodes and
shift the circle towards the right (or the left, in this tutorial,
the direction of reading is privileged to facilitate comprehension
but in a real modelling, one is completely free to take a direction or
5/ In the Editing buttons window,
F9key, set the curve's [3D] property:
... otherwise it will remain plated
in the plan [ XY ] .
6/ Get out of the Edit : TABkey
7/ Add a second circle (bezier or nurbs,
8/ In the Editing buttons window,
F9key, note its name carefully .
9/ Select again the first circle:
10/ In the Editing buttons
window, F9key, modify the field [BeVOb] with the name
of the second circle.
Normally, you must see a volume
You can move without any danger the small
circle, the profile, in another layer. The process is simple:
select the object and MKEY, we chose layer 2, as you see in
the picture below (the afficionados of blender often put the objects of
this type in the last layer). Do not forget to push the [
OK ] button before to leave this window.
11/ Copy the ring in Linked
You can use the short key
the location of this copy in entering 45 degrees of rotation on the
Z axe, you do so in the field "RotZ"of the "Transform Properties"
panel that can be displayed with NKey :
You do the operation above mentionned
7 times by increasing the value of 45 degrees at each step (45,
can also do it much faster by using a python script ::
from Blender import Object
from math import pi
for n in range(1,division):
13/ All the secret of this technical
lies in the use of shared data. So , there is no other solution than
to carry out the modifications in Edit mode.
You must also stay in wireframe
display mode to be able to locate the positions of the other curves.
Each displacement,rotation or scaling will be automatically passed on all
the other curves.
This part of the realization stays very
"artistic". One must proceed by slight transformations and leave
the Edit mode to judge of the result .
With a lot of patience you
can obtain the following result :
the file, simple version
the file, complex version
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