How to Use Blender Physics
Besides being able to model, render and animate 3-D scenes by hand with Blender, you can also automatically simulate physics, for use in games and animated videos. It can be difficult to figure out on your own, but once you know how to use Blender physics, simulating interactions between solid objects is easy.
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Instructions
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If you haven't used Blender much in the past, have a look at the Blender QuickStart Guide (see References) to get up to speed.
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Create a plane. Press the spacebar while the mouse cursor is in the 3-D window, and choose Mesh > Plane from the Add menu. Scale it up by pressing S and moving the mouse. Left-click when it reaches the size desired.
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Switch to front-view (press 1 on the numeric keypad), and press Z to change the view to wireframe. This will allow you to see the plane better from the current angle. Right-click on the cube to select it, and drag it upwards.
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Return to top-view and create another plane, as well as a sphere (from the Add menu, choose Mesh > UVsphere). Increase the scale of the new plane as well, but only along the horizontal axis of the screen. Hold down the middle mouse button while scaling to constrain the deformation.
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Now go to side view again to finish setting up the scene. Move the sphere up and to one side, and position the long, narrow plane underneath it. Rotate the plane with the R key, to form a ramp sloping down to the large, flat plane.
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Set up the physical properties of all the objects. Press F4 to change the Buttons window to the Logic panel, and depress the Actor button for both planes. This make them physically solid objects. Do the same for the cube and the sphere, but also turn on the Dynamic and Rigid Body properties---this makes them affected by gravity and other forces, and allows them to tumble and roll. Click the Bounds button just beneath Actor, and set the bounding box shape to "sphere" for the sphere, and "box" for the cube.
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Having finished putting the physics in place, it's time to run the simulation. Press Shift-Z to switch from wireframe to shaded view, drag on the 3-D window with your middle mouse button to get a better viewing angle, and press 5 on the keypad to turn on perspective. Press P to play the simulation, and enjoy! When you're done, press Esc to return to the regular 3-D window.
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