Knead
April 16, 2015, 3:20am
1
Hi all.
In the helpfile about Command: _CreateUVCrv
http://docs.mcneel.com/rhino/5/help/en-us/index.htm#commands/createuvcrv.htm%3FTocPath%3DCommands|Alphabetical|C|_____66
CreateUV_Knead_1st.3dm (67.4 KB)
Note: The control polygon determines the sizes of the uv curves.
Do you know what’s the meaning of this?
In the attached file:
Command: _CreateUVCrv and then Command: _Length
U line length = 26.2393
V line length = 22.096
Why is this U line length = 26.2393 and V line length = 22.096?
vs
Command: _ExtractControlPolygon and then Command: _Length
However the length of control poygon did not same with length of UV line.
What is the reason?
pascal
(Pascal Golay)
April 16, 2015, 3:24am
2
Hi Knead - I believe the phrase
Simply means that the overall rectangle that is unrolled will be determined by the underlying surface and not the trimmed face. Does that clarify things?
-Pascal
Knead
April 16, 2015, 4:20am
3
Unroll? But, It is not developable because it is doubly curved.
Hmm, Sorry but i can not understand it.
Would you please attach the example 3dm file?
pascal
(Pascal Golay)
April 16, 2015, 4:25am
4
CreateUVCrv_UnderlyingSrf.3dm (72.2 KB)
Does that file help?
-Pascal
Knead
April 16, 2015, 4:47am
5
In the CreateUVCrv_UnderlyingSrf.3dm:
The overall rectangle UV curves:
U Length = 262.213 millimeters
V Length = 206.779 millimeters
Are these UV length (Maximum or Minimum) of the underlying surface edges or isocurves?
I want to know how to the calculation of UV length manually from the surface.
pascal
(Pascal Golay)
April 16, 2015, 4:52am
6
These are the surface edge lengths in parameter space - the 3d edge curves may well be and usually are, different. You can untrim the surface and measure the edges to check. As far as I know there is no reliable way to know the dimensions of the UV curves from the surface.
-Pascal