The field evaluator object is capable of evaluating useful material and physical properties at its location in 3D space. Evaluation follows general hierarchy rules of material mapping i.e. only materials mapped to the evaluator object or its parent levels are considered. Evaluated properties can be used as parameter information for intelligent animations. Usually the field evaluator object itself is not the target of animation or material mapping, but it is placed into the hierarchy of other objects to examine their properties.
The Value channel shows the result of evaluation of the material channel defined in the Channel selector below it. All surface property channels and user defined channels are available for evaluation.
Velocity, Spin, Acceleration and Angular Acceleration show the respective physical properties of the Field Evaluator object during animation playback. In addition, you can use them to enter key values when key framing objects which have been parametrized with the field evaluator attributes.