6.5. Building surface

To set the surface options, click on the arrow on the right side of the Create surface for current structure button and select the Set surface creation parameters.... The dialog box shown in Fig. 6.12 will be displayed.

• The smoothness of the surface is defined by the Smoothing pass count parameter. With this parameter set at zero value, the form of the surface is as close as possible to the structure. With an increase in the value, the surface roughness disappears.
• The maximum number of polygons is defined by the Max triangles count parameter. An increase in the number of polygons heightens the accuracy of the surface construction. If the specified number of polygons is excessive or not sufficient for the construction of the surface, the DICOM Viewer will use the value from the acceptable range that is closest to that set by a user.
• The thickness of the shell is defined by the Shell thickness(mm) parameter. If the value is greater than zero, then the shell has an inner and an outer surface. Both surfaces will be exported to a file.
• To create the surface only for the largest structure, check the Remove secondary surfaces box.
• If the Use current clipping box is checked, then the surface is built only for that part of the structure which is inside the cube. If the Clipping box tool is not active, this parameter is not used.
• If the Interpolate vertex positions box is checked (checked by default), the surface is smoothed at the border of the volume.

To apply the settings, click OK. To cancel the settings, click Cancel.

To create a surface, click on the left side of the button.

The transparency of the polygon model corresponds to the transparency of the segmented structure. If CPU is selected as the rendering device and also on macOS, transparency of polygonal models is not supported.