R_Bibb_Medical_Modelling_The_Application_of_Adv.pdf

6.110 The selected region of facial anatomy.
Case studies 271
dimensional texture image in the box. The ‘emboss’ function was used to
set varying depths of texture relief, at 0.1, 0.15, 0.25, 0.35, 0.5 and 0.8 mm.
These depths corresponded to the wrinkle depth scale and associated measurements
in various facial areas developed by Lemperle et al. (15). The
actual emboss depth produced in the model is also infl uenced by the grey
scale values in the image. Black areas are embossed to the full depth
selected whilst grey areas will be proportionally embossed to lesser degree.
The embossing effect may be previewed as an image (Fig. 6.111) or as the
resultant texture relief (Fig. 6.112). The ‘ruler’ function in FreeForm ® was
used to ascertain the depth of the textures by measuring the distance from
an original smooth copy of the part, to the deepest part of the grooves in
the textured part.
Step 3 – RP manufacture The blocks were manufactured using ThermoJet ®
printing with the contour surface set facing upwards. The test pieces were
18.5 mm × 35 mm × approximately 27 mm high at the tallest point. All six