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The reactor Utility
 
 
 
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Utility panel reactor

You can access much of reactor's functionality through the reactor utility. It lets you preview the simulation, change world and display parameters, and analyze the convexity of objects. It also lets you see and edit the rigid body properties associated with objects in the scene. Perhaps most important, it lets you switch between the Havok 1 and Havok 3 engines.

The utility is divided into a number of rollouts. For more information, follow the links. More information about the two different Havok versions is available later in this topic, in Differences between Havok 1 and Havok 3.

Differences between Havok 1 and Havok 3

You can use either of two different dynamics solvers in reactor: Havok 1 or Havok 3. To switch between them, choose the desired solver from the drop-down list on the About rollout. The active solver is saved with the scene file.

The difference between the two, in a nutshell, is that Havok 1 provides a broader range of functionality, but Havok 3 is faster and more accurate. If your simulation requires only rigid bodies, you'll generally get better results with Havok 3.

Following is a more detailed list of differences:

Feature Havok 1 Havok 3
Simulation Discrete only Discrete or Continuouswith extra parameters
Supported bodies Rigid/Cloth/Soft/Rope/Deforming Mesh/Water Rigid only
Rigid Body Properties Standard Standard + Shell/Penetration/Quality
Cooperative Constraints Breakable Constraints Linear, Angular Threshold
Cooperative Constraints Strength settings Strength, Tau Strength only
Preview Window: display Textures, smoothing, actual geometry Simulation geometry only
Preview Window: interaction during preview right-button drag hold Spacebar and move mouse
Toy Car Standard Additional parameters
NoteIf you preview a simulation or create an animation using Havok 3 and the scene contains non-supported entities such as soft bodies, reactor simply ignores these entities and excludes them from the simulation.