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Field object are used to deform brep objects. You should not try to render it. Field objects are completely programmable, you can write you own field.
A field is a vector field. It exists only inside a volume. In the editor you will se a solid object ( like a box ) and inside two curves, each of a different color. One is the curve before to apply the field on it, the other the same curve after to apply it.
You can move a field object like any other object, you can translate, rotate, scale it. To apply it, select a brep object ( click on it with left button of the mouse ) the press `f' key. You must choose which field object apply ( you may have more that one in your layer).
Field will be applied only to control points that are inside the field volume, so you can change only a portion of an object.
It is better that you use brep object with inline models.
In directory "Library\field" you can find some predefinite fields:
Every field can be customized with same specific parameters ( different from field to field ), which modify its behaviour. You can change them with Edit|Object|Modify command.
If you want to modify a field variable, choose it in the listbox,
then click the "update" button to see the value of the variable and the
range (from,to). To change a variable value use "change" button.