incorrect fill with complex 2D curve (coming from an svg import) #43902

New Issue

John Allwine · 2015-03-05T19:20:09+01:00

John Allwine commented

2015-03-05 19:20:09 +01:00

System Information
Mac OS X 10.10.1

Blender Version
Broken: 2.72b

Short description of error
When I import this svg, blender doesn't fill it correctly. The svg was exported out of the GIMP (2.8.4) from a selection that was converted to a path. It opens and fills correctly in Inkscape (0.48.5 r10040).

svg_import.blend

Exact steps for others to reproduce the error
Import attached SVG file into an empty blender file. The attached blend file shows the results of a previous import that is scaled up.

**System Information** Mac OS X 10.10.1 **Blender Version** Broken: 2.72b **Short description of error** When I import this svg, blender doesn't fill it correctly. The svg was exported out of the GIMP (2.8.4) from a selection that was converted to a path. It opens and fills correctly in Inkscape (0.48.5 r10040). [svg_import.blend](https://archive.blender.org/developer/F147448/svg_import.blend) ![logo.svg](https://archive.blender.org/developer/F147449/logo.svg) **Exact steps for others to reproduce the error** Import attached SVG file into an empty blender file. The attached blend file shows the results of a previous import that is scaled up.![inkscape.png](https://archive.blender.org/developer/F147451/inkscape.png) ![blender_bug.png](https://archive.blender.org/developer/F147452/blender_bug.png)

John Allwine commented

2015-03-05 19:20:09 +01:00

Changed status to: 'Open'

John Allwine commented

2015-03-05 19:20:09 +01:00

Added subscriber: @jallwine

Bastien Montagne commented

2015-03-06 10:14:04 +01:00

Added subscribers: @ideasman42, @Sergey, @mont29

Bastien Montagne commented

2015-03-06 10:14:04 +01:00

@jallwine please do not report bugs about old Blender versions, official one is currently 2.73a, and we are about to release 2.74…

Anyway, even with current master I can confirm issues here, yet looking at the curve it seems valid (i.e. no ugly overlapping afaics). Looks like scanfill is failing (due to curve being too complex?).

Campbell, Sergey, think you know that area of code much better than me?

@jallwine please do not report bugs about old Blender versions, official one is currently 2.73a, and we are about to release 2.74… Anyway, even with current master I can confirm issues here, yet looking at the curve it seems valid (i.e. no ugly overlapping afaics). Looks like scanfill is failing (due to curve being too complex?). Campbell, Sergey, think you know that area of code much better than me?

Bastien Montagne changed title from ~~incorrect fill when using svg import~~ to incorrect fill with complex 2D curve (coming from an svg import)

2015-03-06 10:14:52 +01:00

Sergey Sharybin commented

2015-03-06 10:17:55 +01:00

It's most likely just a self-intersection happening somewhere across those pile pf vertices.. This situations are handled differently in Inkscape and Blender.

Sergey Sharybin commented

2015-03-06 10:29:09 +01:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2015-03-06 10:29:09 +01:00

Sergey Sharybin self-assigned this 2015-03-06 10:29:09 +01:00

Sergey Sharybin commented

2015-03-06 10:29:09 +01:00

There are two intersecting islands in the area highlighted with the grease pencil there: http://www.pasteall.org/pic/show.php?id=84854

This confused inner/outer detection of the scanfill. Sure improvements are possible, but it's how scanfill always worked. Just avoid having such situations.

Thanks for the report anyway!

There are two intersecting islands in the area highlighted with the grease pencil there: http://www.pasteall.org/pic/show.php?id=84854 This confused inner/outer detection of the scanfill. Sure improvements are possible, but it's how scanfill always worked. Just avoid having such situations. Thanks for the report anyway!

John Allwine commented

2015-03-06 15:16:10 +01:00

Just because that's how it's always been doesn't mean that it's not a bug. Does it give good results in other situations? Seems like matching other popular open source projects is a good idea (Gimp and Inkscape). How might I fix this situation?

Campbell Barton commented

2015-03-07 05:30:08 +01:00

@jallwine, its not a bug because the code is working as intended.

Of course adding support for self intersecting curves could be a useful enhancement.

@jallwine, its not a bug because the code is working as intended. Of course adding support for self intersecting curves could be a useful enhancement.

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incorrect fill with complex 2D curve (coming from an svg import) #43902