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  1. #1
    Join Date
    Jun 2007
    Location
    Montreal
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    729

    Default Gaps on booleans

    Hi,

    There seems to be a problem with booleans leaving a visual gap even if there isn't
    Here's an example with two black squares intersected (Xar file attached) ->

    Click image for larger version. 

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    Also when a shape is cut, it produce a slight outline ->

    Click image for larger version. 

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    It is quite annoying when outputting bitmaps.
    When opened in other software the gaps doesn't appear.

    This behaviour appeared recently, I don't know in which version.

    Thanks,

    Marc
    Attached Files Attached Files
    ________________________________
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  2. #2
    Join Date
    Apr 2012
    Location
    SW England
    Posts
    9,527

    Default Re: Gaps on booleans

    MarcT, I've gone back as far as v11 and the artefact appears on them all.

    All I can think is the shapes and the cut are not exact pixels or aligned on whole pixels when rendered as images.

    Acorn
    Acorn - My currently active Xara software: occasionally serviced XDPX, purposely unserviced XDPX12 & XDPX11 (32/64-bit), unserviced XWD Premium 15 & 12, XPGD10, X3D7 and lots of 'permanently-owned' licences back through time (to CC's Artworks)

  3. #3
    Join Date
    Feb 2007
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    UK
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    16,510

    Default Re: Gaps on booleans

    it is a visual artifact caused by xara's anti-aliasing - if you drop the view quality down to 'full colour' it should disappear

    it is possible exact pixel positioning may help in some instances....
    -------------------------------

  4. #4
    Join Date
    Jun 2007
    Location
    Montreal
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    729

    Default Re: Gaps on booleans

    Thanks Acorn, I've Also checked on the latest and V11 but not before.

    Marc
    ________________________________
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  5. #5
    Join Date
    Jun 2007
    Location
    Montreal
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    729

    Default Re: Gaps on booleans

    Hi Steve,

    That's very interesting, sliding the view quality to the middle does make the artifact dissapear.
    What's most incredible is that bitmap export are also generated without those gaps.

    So that will be a workaround for exporting, I just wonder if the slider will affect other aspects also.

    Thanks,

    Marc
    ________________________________
    Illustrations

  6. #6
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    UK
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    Default Re: Gaps on booleans

    Marc

    AFAIK:

    full colour view turns off the anti-aliasing; the gap you see is not really a gap, it is an 'interference pattern' resulting from the way antialiasing is applied during the slice/intersect operation; so turing off anti-aliasing 'removes' the effect which is purely visual

    so it would therefore follow that exporting an object as a bitmap when in full colour view, would export it 'without' antialiasing - but I have not done this for far too long to remember for sure
    -------------------------------

  7. #7
    Join Date
    Nov 2013
    Location
    Hertfordshire, UK
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    1,136

    Default Re: Gaps on booleans

    Quote Originally Posted by handrawn View Post
    Marc

    AFAIK:

    full colour view turns off the anti-aliasing; the gap you see is not really a gap, it is an 'interference pattern' resulting from the way antialiasing is applied during the slice/intersect operation; so turing off anti-aliasing 'removes' the effect which is purely visual

    so it would therefore follow that exporting an object as a bitmap when in full colour view, would export it 'without' antialiasing - but I have not done this for far too long to remember for sure
    ^ This is correct. It's probably one of the oldest "bugs" we have.

  8. #8
    Join Date
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    UK
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    16,510

    Default Re: Gaps on booleans

    oh rob now you make me feel old
    -------------------------------

  9. #9
    Join Date
    Jun 2007
    Location
    Montreal
    Posts
    729

    Default Re: Gaps on booleans

    Quote Originally Posted by MarcT View Post
    This behaviour appeared recently, I don't know in which version.
    Quote Originally Posted by Rob-Xar View Post
    ^ This is correct. It's probably one of the oldest "bugs" we have.
    Quote Originally Posted by handrawn View Post
    oh rob now you make me feel old
    Indeed Hahaha!
    ________________________________
    Illustrations

 

 

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