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+6 % dimensional error with SVG not at correct size in OpenCam

Discussion in 'CAM' started by Kevl4r, Sep 13, 2021.

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  1. Kevl4r

    Kevl4r New
    Builder

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    Hi there,

    I am encountering an issue in Open Cam.

    I have this SVG that has a width of 978 mm, made with Inkscape. (purple rectangle below for the width)

    inkscape_978.png

    To be sure I have rechecked the dimension in other softwares :

    In Blender :
    blender_978.png

    In LightBurn : (See the Width below)
    lightburn_978.png

    In all 3 softwares the width is 978 mm, so I am thinking that the file is correct size wise.

    However when I drop the file in OpenCam I get a width of 917 mm :
    opencam_917.png

    opencam_910_zoomed.png


    Any help would be greatly appreciated.

    Thanks,
    Thomas.
     
    #1 Kevl4r, Sep 13, 2021
  2. Kevl4r

    Kevl4r New
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    To be sure I have also started a new project in Inkscape test_855.svg, that is 855 mm of width.
    when I open this file in OpenCam it changes to 801 mm of width.
    opencam_855_test.png
     

    Attached Files:

    #2 Kevl4r, Sep 13, 2021
  3. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
    Staff Member Moderator Builder Resident Builder

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    Play with your DPI settings, or use DXF (proper dimension info in the file): OpenBuilds CAM assumed DPI from the standards for different applications and versions as below. One of the disadvantages of SVGs. Its unitless (pixels * dpi to reconstruct to actual mm/inch) whereas proper CAD formats like DXF does maintain measurement units as well.

    Code:
    if (editor == "inkscape") {
    if (version > 1.0) {
      resol = 96dpi
    } else if (version > 0.91) {
      resol = 90dpi
    } else {
      resol = 96dpi
    }
  } else if (editor == "illustrator") {
    resol = 72dpi
  } else if (editor == "Opentype.js") {
    resol = 57dpi
  } else {
    resol = 96dpi
  }
     
    #3 Peter Van Der Walt, Sep 13, 2021
  4. Kevl4r

    Kevl4r New
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    Thanks Peter,
    changing DPI has solved the issue.

    I have tried on WIN10 / Inkscape 0.92
    I went to Extensions > Document > DPI 90 to 96
    Saved the document
    In OpenCam it has now the correct size.

    On Linux Arch / Inkscape 1.1
    works the same as in windows 10 :
    I went to Extensions > Document > DPI 90 to 96
    Saved the document
    In OpenCam it has now the correct size.
     
    #4 Kevl4r, Sep 13, 2021
    Last edited: Sep 13, 2021
  5. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
    Staff Member Moderator Builder Resident Builder

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    Thats a super old version of Inkscape (2017) - try to stay more up to date to avoid issues. You should be on 1.1.x Download Inkscape 1.1 | Inkscape
     
    #5 Peter Van Der Walt, Sep 13, 2021

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