I am using Blender version 2.77a. I am attempting to make a paper model of a mesh that has been UV mapped, but not to scale. I need to:
Measure the distance between any two vertices on a UV map
Make a duplicate of a UV island
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$\begingroup$ I'm not sure I understand what you're trying to do. Can't you blow up the the UV layout and print it at whatever size you need? $\endgroup$– MattCommented Jun 24, 2016 at 21:15
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$\begingroup$ ....or are you wanting to make the papercraft version without having to print out the UV layout? $\endgroup$– MattCommented Jun 24, 2016 at 21:17
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$\begingroup$ What do you mean by "make a duplicate of a UV island", wouldn't Shift+D be sufficient, or I am I not understanding what a UV island is? $\endgroup$– Unnamed Sentient BeingCommented Jun 24, 2016 at 22:00
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$\begingroup$ Duplicate an UV island makes no sense. "Geometry" in the UV mapping is dependant on the actual geometry. You can't add anything only in the UV geometry. $\endgroup$– GunslingerCommented Jun 24, 2016 at 22:17
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$\begingroup$ By duplicate a UV island I was wondering if it was possible to copy a UV island without copying geometry(some parts of the model were mapped to the same UV coordinates) $\endgroup$– AnonymousCommented Jun 25, 2016 at 17:07
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1 Answer
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I don't believe there is any true way to measure the distance between two vertices in the uv image editor, but there is a fairly simple workaround.
Finding the (x,y) distance between two points
With your mesh unwrapped and the UV/image editor open, open the properties panel within the editor via n. At the top there will be what is called "UV vertex". Once you select a vertex it will tell you the coordinates of the vertex.
Okay, now the hard part. After finding the coordinates of the second vertex use the distance formula, which is:
√ (x2−x1)2+(y2−y1)2
This online distance caculator should make things easier.
Duplicating a UV island
In 3D View
First and foremost you must select the desired UV island, like so:
1. Enter edit mode TAB
2. Put select mode on "face" CTRL+TAB
3. Hover mouse over the desired UV island and press L.
4. Hit Shift+D
In UV/Image Editor
Whatever you copy and paste in 3-D view should appear in the image editor.
References
answered Jun 24, 2016 at 22:48
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1$\begingroup$ I'm not sure if calculating the distance in pixels is the right way here, at least calculate it with normalized coordinates so the range will be 0 to 1.00 ; by default an unwrapped mesh with no image loaded will be mapped on an empty canvas size of 256x256 pixels , once you load an image your calculated distance is off , especially if the image is not square dimension. not to mention the rounding errors between integers and decimals. i may be wrong about this though. $\endgroup$– user2816Commented Jun 24, 2016 at 23:11