3rdTech DeltaSphere-3000 Manuels rapides - Page 3

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Range Scanning with the DeltaSphere-3000

Your system is set up and warmed up as described in quick guide I, and SceneVision is running and connected to the
DeltaSphere-3000.
1. Raise the geared column on tripod 8 in. (20.3cm) using the 8" measuring rod or some other measurement.
2. Lock the tripod's geared column screw. If you're using the dolly, lower it.
3. Check that quick-release base is tightly screwed to tripod
4. If this is the first scan of a scene, select New Scene from the File menu. Type a name for the scene. All the scans from this scene will be
included in this name.
5. Specify the horizontal field of view.
If you are doing a 360° scan, type -182 and +182 in the min and max boxes. -4 to 360 is okay as well – but make sure you
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have enough slack in the cables.
If you're not doing a full scan, use the manual pan controls to aim the system. Move it (usually with reverse buttons) to the
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starting point and select Set Min. Then move it (forward) to the ending point and select Set Max.
Options
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Select Make Zero at the starting point and then select Set Min. This will make the starting point 0.
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If you want 0 to be a particular direction (e.g. north), use the manual pan control to aim the unit until it is facing north and select
Make Zero. Then set the Horiz. FOV as in step 5.
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You can also simply type numbers into the Horiz. FOV boxes if you want.
Note: If you can't rotate back to the starting point because it's farther than -185 (the limit), rotate it until it stops.
Then Make Zero, then rotate it some more.
6. Set the vertical field of view. -55 to 75 is typical to cover an entire scene. Outdoors you may not need to go that high.
7. Set the speed in revolutions per second. 8 is the most common setting..
8. Set resolution in sample/deg. 13.333 is the most common setting.
Options
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Use 15 if you want especially high resolution for detailed objects or for very long range scans. Use a lower number if all you're
trying to get is a simple room model or if you want a quick scan of the area. Set resolution to 5 and then set the speed to 16 to do a
scan in under 2 minutes.
9. Set the max range. This is the maximum distance you will record in the scene. Choose a number that is definitely farther than you want to
scan.
10. Clear the area and wear protective eyewear.
11. Select Start under the word Scan at the left of the window. You will be asked to name the scan. Name it something useful, e.g. westbed or
kitchdoor. It will begin to scan.
Note: The system rotates clockwise to the starting point and then scans in a counter-clockwise direction. Keep people
out of the way of where it is scanning – but it's not a disaster if someone walks through.
12. Save the scene by hitting the save button. The files are already written to the disk.
When finished, don't move anything until you capture color. Go to Capturing Color.
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Strategic Tips

Do a 'reference', 360° scan, for each individual room. It will help you align any smaller scans you do in the room.
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Do smaller scans for the backs of surfaces or for close-ups of key parts of a scene, but make sure you have enough overlap
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with other scans or with the reference scan to align them. You need more than a part of one wall to do good alignment –
floors, ceiling, and corners help.
If you need to connect 2 rooms, do a large scan with the tripod either in the doorway or very near the doorway. This will
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give you enough surfaces from the two rooms to align them. If the scanner is far from the doorway you'll only get a small
view of the adjacent room and it may not be enough for alignment.
Set the tripod high enough for furniture surfaces or low enough to see beneath tables. This might require multiple scans
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from the same tripod location but with different heights.
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Scan key elements such as faces or artwork or blood spatter, facing them – not from a very oblique angle.
Check your data. Do a quick '3D popup' after a scan to make sure you got the data you needed. It only takes a minute.
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Select the range file window and hit the 3D Popup button.
DeltaSphere-3000 3D Scene Digitizer
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9/23/05