In view of current developments in the theory and technology of digital design, certain potential for novel direction in virtual prototyping is beginning to emerge. In this paper an approach for the employment of virtual prototyping as a generative environment for performance-based design is proposed. The term combines both the concepts of performance and digital generation. In creating digital design environments for design the generative capabilities are incorporated within performance-based simulations. The potential of performance-based simulation as a digital design methodology in architectural design is explored. Experiments in digital architectural design illustrate this approach. Works in a framework of an “experimental digital design” are presented and illustrated.