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.
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.
|Feature||Havok 1||Havok 3|
|Simulation||Discrete only||Discrete or with extra parameters|
|Supported bodies||Rigid/Cloth/Soft/Rope/Deforming Mesh/Water||Rigid only|
|Cooperative Constraints||Linear, Angular||Threshold|
|Cooperative Constraints||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|
This rollout lets you set some general parameters for your simulated world, such as the strength and direction of gravity, the scale of the world, and how easily objects can collide with each other. When Choose Solver is set to Havok 1, the rollout name is Havok 1 World, and when Choose Solver is set to Havok 3, the name is Havok 3 World.
These settings let you store collision details from your scene, and enable and disable collision detection for specific pairs of objects. Pairs of objects with collisions disabled pass through each other during the simulation.
This rollout lets you specify display options for your simulation, including cameras and lighting. These options have no effect on the actual behavior of the final animation; they affect only the appearance of the .
reactor provides a number of helpful utilities that you can use to analyze and optimize your simulation. For instance, you can check your reactor world for the presence of any unusual physical states that might cause problems with the simulation, such as excessive gravity, and you can remove redundant keyframes from a generated animation.