Various techniques implement an electronic design with physical simulations using layout artwork. The approximate behaviors of the electronic design are determined. A region in the electronic design is identified. A first three-dimensional model is identified, if pre-existing, or generated, if non-existing, for the region in the electronic design. The behaviors of the region is determined using at least physics-based techniques or methodologies that are preconditioned upon at least a portion of the approximate behaviors determined for the electronic design.