Global Physics Settings (New for 5)

Setting Simulating Environments

Because Gravity is the major influence in the physics phenomena, you need to set the direction of the gravity before simulating.

1. Click the Physics Settings (Shortcut: Shift + F9) button on the right-side of the Tool bar.
2. In the Physics Object Settings panel, click the Physics World Settings button.
   
3. Set the gravity direction by typing values in the Gravity fields. By default, the (X, Y, Z) equal to (0, 0, -9.8), which are the gravity values of the earth in iClone.
   
4. Drag the World Scale slider in accordance to the size of your 3D world.
   • A larger world scale value can increase the animation speed, which speeds up the slow default motion physics; and vice versa. Remember that you must adjust the value according to the size of your 3D world. If you want to create sharper and faster speed physics animation, then you may increase the value to 6 or 7.

     3D World of Common Size
     World Scale = 5 (Default value) The speed is normal.	World Scale = 8 The physics animations are accelerated.

   • If you create tiny physics objects, then every physics animation will increase in speed in a default world scale where you can hardly see these objects. For this, please decrease the world scale to decelerate the global simulation speed.

     Physics Object Size < (0.1, 0.1, 0.1)
     World Scale = 8 The physics animation is too fast. (Observe the shadow of the ball)	World Scale = 2 The physics animation is back to normal.

   • If you create massive physics objects, such as a world with giants, then every physics animation will turn slow. Please increase the world scale to accelerate the global simulation speed.

     Physics Object Size > (1000, 1000, 1000)
     World Scale = 1 The physics animation is too slow.	World Scale = 10 The physics animation is back to normal.

Once you adjust the physics world settings, then you may start to simulate the animations for the physics objects including Rigid Body and Soft Body.

• The Rigid Body Simulation
• The Soft Body Simulation

After you construct a physics structure with different rigid bodies, you may experience slight jittering during the simulation. Possible causes include:

• The Mass differences are too high between the components in the structure.
• The Bounds that compose your structure collide with each other too sensitively.

By increasing the value of the Constraint Stability, the occurrence of jittering can be alleviated. However, when the value is too high, the Spring effect will be diminished.