[x3d-public] Alternate Units for X3D and 3D Printing

[Alan Hudson]

Last I checked NetFabb does not support units or transforms of X3D
geometry.  We do as you suggest and scale the coordinates to m when
converting to X3D.  Most X3D implementations that I know of use Floats for
their coordinate positions.

On Fri, Dec 8, 2017 at 7:20 AM, Ryan, Justin <jryan1 at phoenixchildrens.com>
wrote:

> Hello X3D Public List,
>
>
>
> I was hoping someone could answer a question for me regarding units. I
> have been translating STL to X3D for medical 3D models. While the STLs are
> technically unitless, the de facto standard unit of medical 3D
> reconstruction is mm. A direct conversion means that the X3D are scaled up
> by a factor of 1000.
>
>
>
> While I am working on creating a script to scale the coordinate points, I
> was also hoping on utilizing xml tags to also scale.
>
>
>
> I attempted adding the following (separate and together); however, opening
> the files in netfabb had zero impact on its import scale.
>
>
>
> Option 1 (right after opening scene tag):
>
> <physical><length unit=”MILLI” basis=”1” numeral=”DEC”/></physical>
>
>
>
> Option 2 (right after opening head tag):
>
> <unit category='length' conversionFactor='0.001' name='millimeters'/>
>
>
>
> Any ideas as to why neither of these fixed my scale issue? Besides
> changing the actual coordinate points (dividing all by 1000), are there
> other unit tags that might be opened by netfabb? My concern with using a
> <transform scale…> is that the reason why there is a scale might be lost if
> the files were being disseminated.
>
>
>
> Last follow-up question, what is the maximum precision of coordinate
> points within X3D (if I do go the divide by 1000 route)?
>
>
>
> [image: cid:image001.png at 01CE68DD.51995EF0]
>
> [image: cid:image002.jpg at 01D29DA3.311203E0]
>
> *Justin Ryan, PhD*
>
> Arizona State University Adjunct Faculty
>
> Phoenix Children’s Hospital Research Scientist
>
>
>
> *Phoenix Children's Hospital*
>
> *Cardiac 3D Print Lab*
>
>
>
> p (602) 933-3902
>
>
>
> Cardiac3DPrintLab.com <http://cardiac3dprintlab.com/>
>
>
>
> [image: cid:image001.png at 01CE68DD.51995EF0]
>
>
>
>
>
>
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