A SubstructureGenerateModes object is used to define the modes to be used in a modal dynamic analysis.
import step mdb.models[name].steps[name].modeRange[i]
The SubstructureGenerateModes object has the following members:
An Int specifying the mode number of the lowest mode of a range.
An Int specifying the mode number of the highest mode of a range.
An Int specifying the increment used to define the intermediate mode numbers beginning from the lowest mode to the highest mode.