The same analysis objects are used for the elasto-plastic gravity step. The materialstage is updated to simulate elastoplastic response (one more time this applies only to PressureDependMultiYield, PressureDependMultiYield02, PressureInDependMultiYield models) :
updateMaterialStage -material 1 -stage 1
The command above specifies that material 1 should behave according to stage flag 1, which is a elasto-plastic state.