Rotation

After emission, mesh particles can possess an initial angle and rotate by a set value over its lifetime. This can help to randomize the movement pattern of the emitted meshes.

Velocity Related Settings

• Forward to Velocity: This check box determine if the Z axis of the emitted meshes are to be aligned to the moving trajectories (it is very similar to the Align to Velocity mode of the texture emitter).
  
• Initial Roll along Velocity: This value is able to determine the angle when the emitted meshes are first generated.
  
• Initial Roll Randomness along Velocity: Increase this value to assign random rolling angles for each mesh when it is generated.
  
• Spin Speed along Velocity: Increase this value to have the emitted meshes keep spinning during their lifetime. The value can be positive or negative.
  
  Note:

  Currently, you need to set this parameter to -1 for stopping the spinning.

Initial Rotation

• (X / Y / Z): You can use the Initial Rotation to determine the direction for each particle when it is generated.
  
  In the following example, the initial rotation angle is set to (-20.00, -50.00, 0.00).
  
• Initial Rotation Randomness: However, if you want the emitted meshes to have different angle, then you can increase this value.
  

Mesh Particle Rotations

• Free Rotation Speed (X / Y / Z): These three sliders can be used to determine the rotation speed for the emitted meshes.
  
• Rotation Speed Randomness: You can increase this value to have the emitted meshes to rotate in random angle and constant speed based on the Free Rotation Speed values.
  
• Rotation Speed Increment Amount: This setting accelerate the rotating speed for each emitted meshes.