Differences between circumference measurement methods

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Mike

• 2024年08月19日 16:52
• 編輯於

I was attempting to take the measurements of the fabric around the circumference of the model before cutting it out, when I noticed a discrepancy between different methods of measurement. I was wondering why the garment or avatar circumference measures were so different to the internal line approach.

Other factors for reference in case they are relevant:

• all fabric pieces have the particle distance set to 5mm
• Add'l Thickness - Collision (mm) is set to 0.1mm
• Z-Offset (mm) is set to 0

Method 1: Circumference Measure (Garment) - 1146.8mm

Using the "Circumference Measure (Garment)" tool I positioned a measurement line around the hips, which measured 1146.8mm.

Method 2: Surface Circumference Measure (Avatar) - 1130.5mm

Using the "Surface Circumference Measure (Avatar)" I aligned the circumference being measured with the Method 1 line, and got a result of 1130.5mm. This makes sense - moving the avatar into Blender I get the same measure.

Method 3: Internal Lines straight across pattern piece - 1109.4mm

I went into the 2D window and drew a line across the matching pattern piece to where the circumference line was positioned. Going back and forth to the 3D window to compare the position to the Method 1 line, I moved the end points of the internal line on the pattern piece (one half of a pant leg) until they aligned with the Method 1 line at the edges along the center line of the avatar. The internal line was not perfectly aligned along the full length, only the end points, positioned along the midline. This length was then doubled to get the full circumference, giving 1109.4mm.

Method 4: Internal lines curved to fit Method 1 line - 1112.6mm

I used the same approach as in Method 3, but added curve points and moved them in the 2D window until the internal line was closely aligned to the circumference line, getting 1112.6mm. In the attached photo the internal line is visible in yellow, aligned with the Circumference lines from Methods 1 and 2.

Thanks for any insights you can offer!

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• US Designer Support

  • 2024年08月19日 17:39

  Hi Mike. Thank you for the detailed description. You can also always add pictures/screenshots for each step which also might help to clarify, but we will do our best from how we understand your above questions

  The avatar is a solid object (obj) and will have a set measurement, but the garment is fabric which has the ability to stretch, so the material is likely stretching slightly across the avatars body. 

  This is also why if you select an Internal Line and then go to the Property Editor you will see a 2D and 3D measurement

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• Mike

  • 2024年08月19日 21:16

  I see, the stretch is exactly what I was missing! I had not seen the property editor 2D and 3D measurements, that is exactly what I need.
  
  Thank you for your help,
  
  Mike

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• US Designer Support

  • 2024年08月20日 16:05

  Wonderful! You are very welcome

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