R_Bibb_Medical_Modelling_The_Application_of_Adv.pdf

270 Medical modelling
and white image shown in Fig. 6.109 using Photoshop ® software (Adobe
Systems Inc., 345 Park Avenue, San Jose, CA 95110-2704, USA). Suitable
texture images may be obtained from databases, digital macro-photographs
or a pad print of skin produced from an impression.
Step 2 – application of textures in CAD To assess the effect of creating
textures on anatomical shapes associated with maxillofacial prosthetics,
a small section of data was taken from a three-dimensional CAD model
of a human face derived from a three-dimensional CT scan. The area
was selected to display a variety of compound curved surfaces, whilst the
size of the selected area was kept small to minimise build time and cost.
The selected region is shown in Fig. 6.110. A series of test pieces based
on the selected data were created in FreeForm ® with a 0.1 mm edge
defi nition.
A rectangular box was drawn on the contoured surface and the
‘emboss with wrapped image’ function was used to overlay the sample two-
6.109 The manipulated, high contrast version used to create the relief.