FieldSampleTask

`construct.field.sample`: the values of field references at a point of a tet volume (field-presentation §FVO-2, §FVS-1).

In the namespace construct::opal. Declared in src/libs/libconstruct/construct/opal/FieldValueTasks.hpp.

Detailed description

The point is in the item's frame or in world axes. Each field reference gives its value, its unit, how it came to be (interpolated, snapped, element, outside) and its order. The answer names the element and the weights of its corners. A kernel runs at the element's nodes and the value interpolates, so the value is the color under the cursor (§FVK-3). View state: nothing changes.