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DAVID-Laserscanner Forum • View topic - Reflective scanning?!...
Dear DAVID Community,

As you are probably aware, the entire DAVID company, team and product range has been integrated into HP Inc.
This forum is now read-only. Relevant content has been migrated to HP and merged into HP's Support Forums on November 1, 2016.

To start new discussions for 3D Scanning, please register and post your new topic at the HP Support Forums

Reflective scanning?!...

Questions, problems, comments and tips regarding the 3d scanning process.

Reflective scanning?!...

Postby RinksCustoms » Fri Jan 09, 2009 3:12 am

Hello all, first and foremost a thousand thank you's for everybody's efforts writing and experimenting with David software. In my application of David software does not involve reverse engineering but after market and custom design for local street & race cars looking for an edge or want to see how various body kits will look on their car before purchase or sign a contract for custom work. The cars I customize 80% of the time have paint jobs that are $10K+, and the customer and I would feel much better if there was a better way to obtain scan data than painting a car with even water based paints, (which involves a very tedious cleansing process to remove all the silicon based dressing and waxes used to protect the paint from UV damage).

I'd like to present a possible solution but i'm not a very experienced David user, so i would like to present my concept to all of you for your expert opinions before building an expensive motorized scanning platform. They say a picture is worth a thousand words.... NOTE: the light being reflected is not to scale due to youtube's video processing where the original one pixel width line was lost.
Image

And if a picture is worth a thousand words, a short animation should make the point that much better... a short animation and perspective view of the rig in action. For realism all the objects in this simulation are full size dimensions, ie. the front of the car is 3 meters wide.

click here for

Here is the full 16 second clip i'm using as my simulation...

click here for

The big question I have.. With Davidlaserscaner setup for background-less scanning and optimal camera settings, will it be able to detect the shape of the car by the reflection of the light in a similar way that a non glossy objects are detected when a laser line is passed over them? It is likely that i will need to use the mask feature to "hide" the windshield or similar surface which will create a double reflection which i think the David software will not cope with too good. I do not mind if i need to patch a few holes later in CAD.
Last edited by RinksCustoms on Sat Jan 10, 2009 9:27 pm, edited 1 time in total.
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Re: Reflective scanning?!...

Postby MagWeb » Fri Jan 09, 2009 8:47 am

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Re: Reflective scanning?!...

Postby RinksCustoms » Sat Jan 10, 2009 9:24 pm

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Re: Reflective scanning?!...

Postby MagWeb » Sat Jan 10, 2009 11:19 pm

Hi again.

Aha, now I´ve got your idea,....
reflection of a line (neon) instead of projecting a line (laser).

I allready wondered about the specific charakter of the line in your animation.

The either function of the laser is not to project a line on the object, but to "cut" a plane "slice" of the object. All points enlighted by the laser are exactly on one plane (and they don´t have to, if you reflect a line as your neon). DAVID calculates the position of this plane by looking onto the lines on the calibplanes (or the reference scan). Once found this position, the 3D coordinates of the line on the object (in 2D) can be calculated.

Maybe one could build a scanning system for mirroring objects on the base of mirroring a line, but DAVID nowadays thinks another way - sorry.

You´re right: I can imagine that people might be not very happy covering their expensive cars with salt - was just a quick idea

Gunter
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Re: Reflective scanning?!...

Postby florin.topala » Sun Jan 11, 2009 12:34 am

for covering the cars with salt :) ....

it is a ductape ... or maybe similar which is verry easy to remouve and it is used for painting ... I think it is usefull for XXXXXL projects

Florn

PS sorry for my bad english
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Re: Reflective scanning?!...

Postby MeatHEad » Sat Dec 11, 2010 12:12 pm

why were the youtube videos removed?

Does an ideal-like reflective tape exist that can be put over surfaces to get accurate point-cloud data that requires no background with David-Laserscanner?
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