Striations
Previous  Top  Next

Dialog Box: Striations [ Input1 Menu]

Striations are evenly spaced lines on the faces of the given form. These lines are drawn parallel to an actual edge.

Striations are often useful in showing crystal symmetry which is lower than that of the form exhibited. For example, pyrite, group mB3, often grows in cubes, which have the full symmetry of group m3m. However, striations on the cube faces are often present, which bring out the fact that 4-fold axes are not present.

A maximum of 20 forms (not faces) may be striated.

The specifications for striations on individual forms are in the Striation Data dialog, which is accessed with the Revise or Add Striation buttons.

Randomize . This causes the striations to be randomly dashed lines - it does not randomize the spacing of the striations. The Max. line parameter is the maximum length of the solid segments, while Max. interval is the maximum length of the blank interval between solid segments. Both solid and blank segments are randomized in length within these intervals. Lengths are in central distance units (c.d.u.), i.e. the same arbitrary units as the central distance for the forms.

Striations in 3D mode are always lines, not cylinders.