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3DS Max and unit conversion

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icon4.gif  3DS Max and unit conversion [message #3694] Wed, 01 April 2009 06:42 UTC Go to previous message
avatar Magic  is currently offline Magic
Messages: 1293
Registered: August 2008
Go to my shop
Shapie Expert
Shapeways Crew
Hi all,

I was very excited by the new material made available, so I decided to print icecubes.
I wanted to take advantage of this opportunuty to test unit conversion since I had some problems with my previous model.
So I designed a 1cm3 cube in 3DS Max. As my default unit is mm, I made it 10mmx10mmx10mm.
I exported it as STL file. While uploading it to Shapeways, I specified mm as the unit. And I got an error message :

Your object is too small!
[The size is 0.0 x 0.0 x 0.0 cm / 0.0 x 0.0 x 0.0 inch (h x w x d).

I went back to 3DS Max, changed the default unit to meter, without modfying my model. The cube was now 0.01mx0.01mx0.01m (and still 1cm3). I exported it as STL file again. While uploading I specifyed meter as a unit.
New error message :

Your object is too big!
The size is 39.4 x 39.4 x 39.4 cm / 15.5 x 15.5 x 15.5 inch (h x w x d).

Note that 39.4 inches are 1 meter.
Finally I did a last conversion in 3DS MAx to change the default unit to inch. My 1cm3 was now 0.394"x0.394"x0.394". I save it as STL file. Of course while uploading I specifyed inch as a unit.
This time all was correct.

I did not make any test of "cross-unit" (saying in 3DS Mas that I work in mm and then pretending at the upload that the unit is inch). But, with this experiment, has anyone an idea on how 3DS Max and/or the upload function of Shapeways are dealing with the unit conversion ?


PS: I finally give up with the idea of printing icecubes as they seem not to be safe to add in your beverage. Laughing

So many things to design, so little time...

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