A new high-speed manipulation model for a group of individual bodies (GIB) such as sand and lava is proposed in this paper. One of the goals of this research is to use it for applications such as home VR cooking systems for representing eg. a mass of fried rice. In this model, GIB is represented as a height field. Variation in the height field represents movement of the GIB. Transformation of GIB in wide spaces which is beyond adjacent grids is considered. GIB is treated as one object, which means that calculation is done efficiently on one object. Transformation of GIB is calculated quickly. Interactivity has a priority over correct movement of GIB in this model.