#413 Fails to open OFF files containing faces with less than 3 vertices

[Adrian Rossiter]

Meshlab fails to open OFF files which contain face elements which have less than three vertices, for example

OFF
3 3 0
1 1 0
1 0 0
0 1 0
3 0 1 2 1.00000 0.00000 0.00000
2 0 1 0.00000 1.00000 0.00000
1 0 0.00000 0.00000 1.00000

This file is considered valid by Geomview, which uses the 2-vertex faces to hold edge colours, and 1-vertex faces to hold vertex colours. I have followed this in the Antiprism project, and people are having difficulty importing the Antiprism models into Meshlab,

[Paolo Cignoni]

It seems not cited in the official doc
http://www.geomview.org/docs/html/OFF.html
I prefer to say on the official way of keeping per vertex color.

[Adrian Rossiter]

Hi Paolo

On Fri, 7 Nov 2014, Paolo Cignoni wrote:

It seems not cited in the official doc
http://www.geomview.org/docs/html/OFF.html
I prefer to say on the official way of keeping per vertex color.

Thanks for your reply.

The format spec doesn't put a lower limit on the number of vertices
in a face element. Files containing face elements with 1 and 2
vertices are valid by the spec.

Whether they are used for vertex or edge colours appears
to be an application issue, and outside of the spec. However,
I did speak about this to the Geomview project, the source of
the spec, and Claus, the lead developer, confirmed that
Geomview interprets the 1-vertex and 2-vertex face elements
this way

https://sourceforge.net/p/geomview/mailman/message/2004738/

If Meshlab simply discarded these elements and read the rest
of the faces, I think that would be much more useful behaviour
than not opening the file at all.

Best wishes

Adrian

Adrian Rossiter
adrian@antiprism.com
http://antiprism.com/adrian

** [bugs:#413] Fails to open OFF files containing faces with less than 3 vertices**

Status: open
Group: v1.0_(example)
Created: Thu Oct 09, 2014 12:08 PM UTC by Adrian Rossiter
Last Updated: Thu Oct 09, 2014 12:08 PM UTC
Owner: nobody

Meshlab fails to open OFF files which contain face elements which have less than three vertices, for example

OFF
3 3 0
1 1 0
1 0 0
0 1 0
3 0 1 2 1.00000 0.00000 0.00000
2 0 1 0.00000 1.00000 0.00000
1 0 0.00000 0.00000 1.00000

This file is considered valid by Geomview, which uses the 2-vertex faces to hold edge colours, and 1-vertex faces to hold vertex colours. I have followed this in the Antiprism project, and people are having difficulty importing the Antiprism models into Meshlab,

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