Path: chuka.playstation.co.uk!news
From: Craig Graham <c_graham@hinge.mistral.co.uk>
Newsgroups: scee.yaroze.programming.3d_graphics
Subject: Re: 3D Object Size (Vertices section of PLY file)
Date: Mon, 30 Mar 1998 12:17:34 +0100
Organization: Intelligent Research
Lines: 60
Message-ID: <351F7F4E.CD3FB3D4@hinge.mistral.co.uk>
References: <6f9emu$f1o27@chuka.playstation.co.uk> <6fnrcc$6ne6@chuka.playstation.co.uk>
NNTP-Posting-Host: 194.131.235.3
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mailer: Mozilla 4.03 [en] (Win95; I)



Steve Dunn wrote:

> Think I've got it sussed,
>     To make a 'bounding collision box',
> I've decided the best course of action
> to get the object 'size' is
> to poke around and come up with an x,y,z
> size from the Vertices section of the
> ply file associated with the particular
> RSD file.
> Though documentation sais the 'vertices'
> section contains the X,Y,Z co-ords of
> the vertices, one line for each vertex.
> I have found that this is in fact
> incorrect.
> The format I've stumbled across is.. X,
> Z, Y.
> Try it for yourself.  Create a
> 200x200x50 cube,convert it,  and look at
> the vertices in the ply file.  It is
> definitely X,Z,Y.
>
> Anyway, more to point, is there a way to
> get these dimensions from the resulting
> .tmd file ?
>
> Additionally, I should point out that
> this is all in aid of collision
> detection.  If anyone can  turn me
> around and kick me in the direction of a
> nice sample with collision detection I'd
> be very happy indeed.
>
> Any help appreciated.
>
> Steve

Steve, the tmd member of a GsDOBJ2 structure points
to the TMD objects header.

It's structure is something like:
typedef struct {
    SVECTOR *vertices; // pointer to an array with n_verts
                  //elements with the vertex coords in it
    long n_verts;
    NORMAL *norms;
    long n_norms;
    PRIMITIVE *prims;
    long n_prims;
    long scale;
} TMD_OBJECT;

I may have got this in the wrong order as I've not got my machine here,
but
that's the contents of the structure...

Craig.