Add/Revise Form (Cartesian)
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Dialog Box: Add/Revise Form (Cartesian) [ Forms List Dialog]

<Cartesian Mode - see also Add/Revise Form (standard).>

The central distance is the perpendicular distance, from the center of the crystal to the faces of the form in question: the greater the distance, the smaller the area of the face. Also, if there are many forms, the greater the distance the less prominent the form (the smaller the area of the faces). Use the Next Form button to add a form.

The form indices and central distance are all decimal numbers. The indices will be normalized to length one after entry. Five or six significant figures are sufficient.

You can use negative central distances to define a crystal which does not lie on the origin; see the rutile twin example in Chapter 5.

The color, b/w pattern and pen number are used primarily for sections and growth zones.

The Rate Constants button pertains to growth zones. It brings up either the Exponential Growth-Rate Constants dialog or the Growth Intervals dialog, depending on the Exponential/Discontinuous setting in the Growth Zone Settings dialog. The rate parameters can also be set from the latter dialog.

See the Forms List Dialog for the addition of imaginary faces, edges and corners if the real faces do not define a closed shape.