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Subject: [OASIS Issue Tracker] Issue Comment Edited: (OFFICE-1823) ISO/IECJTC 1/SC 34 N 1078 : DEFECT REPORT NUMBER JP2-32



    [ http://tools.oasis-open.org/issues/browse/OFFICE-1823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=19666#action_19666 ] 

Dennis Hamilton edited comment on OFFICE-1823 at 7/15/10 2:19 PM:
------------------------------------------------------------------

With respect to the replacement text of 9.4.5, there are additional questions that need to be answered.

Since the depth is a signed length, it is not clear which is the front or back surface based on the respective orientations.  Is the one that we start with always the front and the one we end at always the back?  We need to know the normal to the polygon to know which direction the depth goes.  Also, does the depth go with the normal direction or against the normal direction from the starting surface?  If we know whether we are starting at the front or at the back we have the answer to this question, once we know the orientatioh of the +X, +Y, and +Z axes relative to the viewpoint.

Finally, the planes always exist.  The question is whether or not there are open or closed surfaces defined by the shapes polygonal intersection with a plane at a beginning or ending of the translation-determined 3D Shape.  There is an ambiguity with regard to the side surfaces and whether visible edges are drawn when neither of the surfaces having the common edge are closed.  I will assume that the side surfaces are always closed.

[added 2010-07-15T18:07Z On further reflection, I have used the notion of open and closed surfaces, rather than opacity.  An open surface is never opaque, a closed surface might be rendered as translucent based on other provisions for the 3D Scene.  The open/closed-surface nomenclature is a little awkward, because it doesn't completely relate to what we usually mean by open and closed shapes in a space.  I don't have any better nomenclature to offer, and it gets even trickier when an end surface is an opening in a closed surface to which the shape being created (by extrusion or rotation) is embedded.]

      was (Author: orcmid):
    With respect to the replacement text of 9.4.5, there are additional questions that need to be answered.

Since the depth is a signed length, it is not clear which is the front or back plane based on the respective orientations.  Is the one that we start with always the front and the one we end at always the back?  We need to know the normal to the polygon to know which direction the depth goes.  (Also, does the depth go with the normal direction or against the normal direction from the starting surface?  If we know whether we are starting at the front or at the back we have the answer to this question.)

Finally, the planes always exist.  The question is whether or not there are (opaque) object surfaces defined on a given plane.  There is an ambiguity with regard to the opacity of any side surfaces and whether visible edges are drawn when neither of the surfaces having the common edge are opaque.

  
> ISO/IEC JTC 1/SC 34 N 1078 : DEFECT REPORT NUMBER JP2-32
> --------------------------------------------------------
>
>                 Key: OFFICE-1823
>                 URL: http://tools.oasis-open.org/issues/browse/OFFICE-1823
>             Project: OASIS Open Document Format for Office Applications (OpenDocument) TC
>          Issue Type: Bug
>    Affects Versions: ODF 1.0, ODF 1.0 (second edition), ODF 1.0 Errata 02
>            Reporter: Robert Weir 
>            Assignee: Svante Schubert 
>             Fix For: ODF 1.0 Errata CD 5
>
>
> Transcribed from http://www.itscj.ipsj.or.jp/sc34/open/1078.htm
> Original author: "MURATA Makoto (FAMILY Given)" <eb2m-mrt@asahi-net.or.jp>
> DEFECT REPORT NUMBER 	JP2-32
> QUALIFIER 	clarification required
> REFERENCES IN DOCUMENT 	Clause 15.22.8 thru 15.22.10
> NATURE OF DEFECT 	These subclauses are incomprehensible.
> SOLUTION PROPOSED BY THE SUBMITTER 	Add diagrams and introduce more explanatory text.

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