Testing a Sense3d: Size does matter

Unlike 123d catch and other photo based scanning systems Sense3d captures things to a specific scale.  Theoretically your scans appear life size.  I made a couple of scans to test this.  The first test was an empty ABS filament box it is about 165mm square and 123mm

Sense3d scan of cardboard box

high.  The scanner couldn’t track well enough to get around the whole box.  It kept making ghost boxes off the end and in the end I gave up.  A famous scientist once said the the two most important words in the laboratory are “that’s funny. . .”.  This was one of those moments.  It seems the Sense3d is unhappy with simple geometries.  It looks like it doesn’t have enough data to track and assemble the model.  This is a bit counter intuitive.  To test this I decided to increase the complexity with the first scan

Scanned pumpkin with calibration box inserted

worthy object at hand.  Which happened to be a pumpkin.  The resulting scan was effortless.  The Sense tracked perfectly and captured all sides of the object effortlessly.  So it seems the trick is to increase the geometric complexity and give it something to sink its invisible laser teeth into.

I imported the scan into Blender and inserted a cube which I sized to be identical to the box which I scanned.  As you can see they are extremely close.  The degree of inaccuracy here could be explained by the irregularity of the cardboard box.  I would like to repeat the test with an object of more accurate geometry like a machinist’s 1-2-3 block which is perfectly square, and perhaps a zucchini . . .

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