Information on the form 3D scan

The information refers to the description of the property and the selection options in the application form (PDF; 140 kB).If you have any questions regarding the cost centre to be specified, please contact the person in charge of your department.

If you have any questions about the options, please contact the RRZK Helpdesk or bring the form with you when you handover the object to be scanned and we wil lhelp you complete it.

The scanner captures the surface of the object by projecting an image of white and black stripes onto the object and capturing the curvatures of these stripes with cameras. This means that if the color of the object also changes the curvature of the stripes, or makes it invisible, the scanner will not be able to capture the structure of the object. Problems are caused by:

• Black spots as the white light is swallowed
• Shiny spots, because not the projected image, but the reflected image is taken
• Transparent places, because not the surface but the area behind the transparent part is seen

If such spots are present on the object, the mesh (3D model) can only be completed if these spots are artificially edited (see post-processing), or if the object is pre-treated with matting spray.

The matting spray leaves a thin, white, powdery layer on the object. Thise liminates the described sources of error. The spray contains solvents. Please check before hand whether the surface of your object issuitable for this treatment.

On the other hand, water must be used to remove the matting spray. If your object is waterproof, the mattingspray can be removed under running water. Alternatively, the object can first be ’dusted' with a brush, but must then be freed of the remains with a damp cloth.

Warning: Fine traces of the powder may remain in very fine cracks or pores.

The examples on the left show from 1 to 3 a Buddha figure whose surface is glossy, the same Buddha figure treated with matting spray, and a crystal which is unsuitable for pre-treatment with mattingspray because it is not washable.

The Surface Condition option is used to specify the structure of the object’s surface. A simple object, such as a cube, requires fewer shots because the structure is already visible from a few angles. An object with loops and arcs, on the otherhand, requires a large number of shots and stronger error control.

Smooth/light shapes refer to simple objects such as cubes, closed boxes or perhaps apples. The first image on the left of a text marker can be used as an example. The surface is smooth and the shape is largely convex and therefore simple.

Rough/friggled refers to more detailed objects such as small model figures, bottles or perhaps strawberries. As an example, the image of the shiny Buddha figure in the paragraph on color and material can serve. The surface is more detailed, but the flanges are only superficial and the arms are fitted.

Angled/very inhomogeneous refers to complicated objects such as hands, glassesor perhaps the lower part of a pineapple. As an example, picture two of a Buddha-figure can be used. The arms stand away from the bodyand form an arch. The recesses between the hands and the bodyare deep and pointed, in addition the elaboration of the head is very inhomogeneous.

Some objects are too angled for the 3Dscanner to capture the surface. The holes created during the scan are also too large to be filled meaningfully. The third image serves as an example of such an object. The inside of a drive, with the deep structure between the individual discs, is not captured by the scanner.