# Re: determine the area on slice

From: Wanchai Rattanawong (wratta@swin.edu.au)
Date: Sat Mar 04 2000 - 00:53:25 EET

Dear Neal
Thank you for your massage. If the model got the hole inside, how can we
achieve this problem. This formulas can't do it. Can I use the matrix form? I
don't know how to do it. Could you recommend for me please?

Thank you very much.

> You can resort to a bit of programming or even an
> Excel. Assuming a set of points describing a single closed
> polygonal region, then the area can be computed as follows:
>
> Area = 0.5 * ( x1y2 - x2y1 + ... + xny1 - x1yn );
>
> This value will be positive for right-handed (CCW) polygons and
> negative for left-handed (CW) polygons. Sum the areas of each
> polygon to determine the total area of a layer.
>
> Good luck
> Neal
>
> Wanchai Rattanawong wrote:
>
> > Dear everyone
> >
> > Can anyone suggest me how to determine the area on each layer? Assume
> > that we have many points on one slice.
> >
> > Best regards,
> > Wanchai Rattanawong
> > Industrial Research Institute Swinburne (IRIS)
> > P.O. BOX 218, Hawthorn
> > Victoria 3122, Australia
> > Tel:(613)9214 5654 Fax:(613) 9214 5050
> > Email: wratta@swin.edu.au
> >
>
>
>

Wanchai Rattanawong
Industrial Research Institute Swinburne (IRIS)
P.O. BOX 218, Hawthorn
Victoria 3122, Australia
Tel:(613)9214 5654 Fax:(613) 9214 5050
Email: wratta@swin.edu.au