Area form a 3D surface

[Neumann]

Hello!

I realize that it is possible calculate the volume using Volume under Surface in the 3D Surfce plot. And how about the area? How is it calculated?

Thanks

L F Neumann

[DPlotAdmin]

Can't be done currently, sorry. I'll look into adding this to the "Find Volume Under Surface" screen.

Or... perhaps make the $AREA shortcut work for 3D surfaces. That would probably be more useful.

[Neumann]

$AREA did not work. I open box text and in Title wrote Area = $AREA. The output was Area = 0.

Neumann

[DPlotAdmin]

Understood. It isn't supposed to work. But I can modify the code to make it work for 3D.

[Neumann]

Gents

I updated to 2.3.0.2 and I was able to find the area of 3D surface using $AREA - thanks!!

First, I foun area equal to 1962 mm2 and the projectec area is 1960 mm2. Very good! After acid etching the area of same surface increase to a 2116,8 mm2 or a 7,5% area increase however another program calculates the same increase as 18%.

may I send my data to you in order to check if I had done ererything correct? How I proceed to send data

regards

L F Neumann

[DPlotAdmin]

You're welcome to send your data to support@dplot.com

Both programs may be "correct" at how they are calculating the area, just doing it differently. If you check "Borders" on the Contour Options dialog you'll see the triangular mesh that DPlot divides your surface into. The reported area is the sum of all of those 3D triangle areas. The other program may be doing some sort of smoothing or cubic spline interpolation to get a different answer (though I wouldn't think it would be that different).

Another consideration is units: DPlot makes no assumptions about units when calculating area; it just uses the numeric values of X,Y, and Z. If X, Y, and Z all have units of mm, then mm^2 is correct.