Results 1 to 3 of 3

Thread: Triangulation patterns in .ifc file format using coordinates and indexes

  1. #1
    Newbie
    Joined
    Apr 2018
    From
    Europe
    Posts
    2

    Triangulation patterns in .ifc file format using coordinates and indexes

    Hello,
    I have an .ifc format which is a CAD format, and it describes a wall in the xy plane by a set of coordinates and their corresponding indexes according to the link explanation:

    Explanation

    I am attaching a .txt where the data is divided into the coordinates in xyz space, then indexes and some other data.

    I was hoping that someone can help me understand how to link the indexes to their corresponding coordinates. There are 164 coordinate pairs and 324 index pairs so it doesn't make sense to me that each index relates to only 1 coordinate pair.

    The goal is to establish a relationship between indexes and coordinates such that this type of data can output the wall thickness, which is in this case '10'. I was thinking that (according to the link above) by taking the first triangle described, it should describe the edge of the wall in 3D and therefore give us one of its sides as the shortest segment in the wall which is the thickness.


    Thank you
    Attached Files Attached Files
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Sep 2012
    From
    Australia
    Posts
    6,608
    Thanks
    1714

    Re: Triangulation patterns in .ifc file format using coordinates and indexes

    Hey yafim.

    You might want to consider expanding out each coordinate in terms of X's, Y's, and Z's [instead of (X,Y,Z) triples) and then use every index triple to get the actual coordinate for the individual coordinate instead of one triple.

    So for example you have X[], Y[] and Z[] and you have an index (a,b,c) then you find X[a], Y[b], and Z[c] not Point(a,b,c).
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Apr 2018
    From
    Europe
    Posts
    2

    Re: Triangulation patterns in .ifc file format using coordinates and indexes

    Hi chiro,
    Thanks for the reply.

    Can you explain what you mean by "actual coordinate for the individual coordinate" ? it's a bit confusing.

    What I understand from your explanation is that the actual coordinates might be related to three indexes per each X Y and Z value, correct?
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Groups, subgroups and indexes
    Posted in the Advanced Algebra Forum
    Replies: 6
    Last Post: Jan 20th 2011, 04:58 AM
  2. P-Sylow subgroups, Normalizers, Indexes
    Posted in the Advanced Algebra Forum
    Replies: 5
    Last Post: Aug 26th 2010, 08:04 AM
  3. Mat lab - Referencing M-file in another M-file
    Posted in the Math Software Forum
    Replies: 5
    Last Post: Dec 16th 2009, 02:53 AM
  4. Primative roots and indexes
    Posted in the Number Theory Forum
    Replies: 0
    Last Post: Nov 9th 2009, 07:25 AM
  5. Sub-indexes
    Posted in the LaTeX Help Forum
    Replies: 5
    Last Post: Jul 29th 2008, 05:10 AM

Search Tags


/mathhelpforum @mathhelpforum