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A system for creating physical simulations using hand-sketched three-dimensional (3D) objects, including: a memory device for storing a program; a processor in communication with the memory device, the processor operative with the program to enable: 3D objects to be hand-sketched and assigned physic

A system for creating physical simulations using hand-sketched three-dimensional (3D) objects, including: a memory device for storing a program; a processor in communication with the memory device, the processor operative with the program to enable: 3D objects to be hand-sketched and assigned physical descriptions; and behavior of the physical descriptions to be simulated in a physics environment.

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1. A system for creating physical simulations using hand-sketched three-dimensional (3D) objects, comprising: an electronic sketching device;a memory device for storing a program; anda processor in communication with the memory device, the processor operative with the program to enable:3D objects to

1. A system for creating physical simulations using hand-sketched three-dimensional (3D) objects, comprising: an electronic sketching device;a memory device for storing a program; anda processor in communication with the memory device, the processor operative with the program to enable:3D objects to be hand-sketched and assigned physical descriptions; andbehavior of the physical descriptions to be simulated in a physics environment,wherein more than one 3D object is hand-sketched and simulated at a time and strokes of one of the hand-sketched 3D objects are interpreted as being separate from strokes of another of the hand-sketched 3D objects when they overlap as they are being made on the electronic sketching device by modeling the hand-sketched 3D objects different from each other as they are input,wherein a first 3D object is assigned surface parameters including at least one surface friction parameter as it is sketched and a second 3D object is assigned surface parameters including at least one surface friction parameter as it is sketched, and the surface friction parameters determine how the first and second 3D objects actively move after they collide with each other. 2. The system of claim 1, wherein the electronic sketching device comprises a graphics tablet and a stylus. 3. The system of claim 1, wherein the electronic sketching device comprises a display and a stylus. 4. The system of claim 1, further comprising: a graphical user interface through which the physical descriptions are assigned. 5. The system of claim 1, further comprising: a display on which the behavior of the physical descriptions is simulated. 6. The system of claim 1, wherein the physics environment is a multi-body physics environment. 7. The system of claim 1, wherein the physical descriptions comprise body objects and constraints connected to the body objects. 8. The system of claim 7, wherein a body object's physical movement is assigned to be moving or stationary. 9. The system of claim 7, wherein a body object's physical properties are assignable. 10. The system of claim 7, wherein the physical descriptions further comprise forces or torques acting on the body objects. 11. The system of claim 7, wherein the physical descriptions further comprise behavior objects that create and delete objects from the simulation. 12. The system of claim 1, wherein the processor is further operative with the program to: operate in a drawing mode in which the 3D objects are hand-sketched and assigned physical descriptions, and a run mode in which the behavior of the physical descriptions is simulated. 13. The system of claim 1, wherein the processor is further operative with the program to: enable the 3D objects to be clicked and dragged prior to and during the simulation. 14. A method for creating a physical simulation using hand-sketched three-dimensional (3D) objects, comprising: hand-sketching first and second 3D objects on an electronic sketching device, wherein the first and second 3D objects are hand-sketched without restriction;assigning a physical description to each of the 3D objects; andactivating the 3D objects so that a behavior of each object's physical description is simulated at the same time in a physics environment,wherein surface parameters assigned to first and second 3D objects include at least one surface friction parameter for each of the first and second 3D objects as the first and second 3D objects are sketched on the electronic sketching device, and the surface friction parameters determine how the first and second 3D objects actively move when they collide, andwherein strokes of the first 3D object are interpreted as being separate from strokes of the second 3D object when they overlap as they are input by modeling the first and second 3D objects different from each other as they are input. 15. The method of claim 14, wherein the physics environment is a multi-body physics environment. 16. A computer program product comprising a non-transitory computer readable medium having computer program logic recorded thereon for creating physical simulations using hand-sketched three-dimensional (3D) objects, the computer program logic comprising: program code that enables:3D objects to be hand-sketched and assigned physical descriptions; andbehavior of the physical descriptions to be simulated in a physics environment,wherein more than one 3D object is hand-sketched and simulated at a time and strokes of one of the hand-sketched 3D objects are interpreted as being separate from strokes of another of the hand-sketched 3D objects when they overlap as they are being made on an electronic sketching device by modeling the hand-sketched 3D objects different from each other as they are input to the electronic sketching device,wherein a first 3D object is assigned surface parameters including at least one surface friction parameter in response to the first 3D object being sketched and a second 3D object is assigned surface parameters including at least one surface friction parameter in response to the second 3D object being sketched, and the surface friction parameters determine how the first and second 3D objects actively move in response to the first and second 3D objects colliding with each other. 17. The computer program product of claim 16, wherein the physics environment is a multi-body physics environment.