Physical Options

Physical engine : Define which physical engine You want to use. Take into account that Physx engine supports only 32 bit MAX, you can use it on 64 bit OS, but only with 32 bit Max.

Start frame : Define simulation start frame.

Time range : Define how many frames will be simulated starting from Start frame.

Collision tolerance (cm) : One of the tasks that reactor performs at each simulation step is detection of whether any objects in the scene are colliding, and then updates the scene accordingly. If objects are closer together than the Collision Tolerance value, reactor considers them to be colliding. A high Collision Tolerance value results in a stable simulation, but it can also cause gaps between "colliding" objects. (3ds Max reference)

For PhysX engine Collision tolerance works in a little bit different way, while reactor add collision tolerance distance to simulated geometry which cause gaps between objects, PhysX engine subtract it, so with high value objects will start interpentrate with each other.

Substeps : Defines simulation substeps for physical engine. Keep it in range between 2 and 10. It is desirable to increase it in case simulation objects pass through each other.
Pay atention that for PhysX engine high value doesn't mean more stable and correct simulation, default value 3 will work in most cases. But in case your simulation contains fast moving objects you should increase it. Decrease it in case you start notice "popcorn" effect.

Gravity : Multiplier for default gravity.

Move timeslider during simulation (only for PhysX) : Check ON if You want to bake animation for simulated objects. Check OFF if You just want to physically spread objects around.

Simulate by dragging timeslider (only for PhysX) : Check ON if You want to create simulation manually dragging timeslider.

Start simulation from timeslider (only for PhysX) : Check ON if You want to start simulation from timeslider frame instead of Start spinner value. That might be useful when you need to create a lot od simple simulations.
Scale Factor (only for reactor): Using it RayFire scales down fragments BEFORE send them into reactor simulation and scale them BACK AFTER simulation finished. It seriously decrease simulation time and completely removes gaps between fragments and collision objects like walls and ground. Set it to 0 to turn it off.

Override properties (only for reactor): when ON, RayFire will override the reactor properties in the simulation.
Turn this OFF, if you want to use your own reactor properties, such as gravity, substeps, and worldscale.

Preview and Create Animation buttons (only for reactor): Gives you ability to use reactor via RayFire User interface.

PhysX simulations buttons.

1. Start preview: Check ON this button to start simulation in preview mode. After Time range will be simulated Physx will start simulation again. So You can interactively adjust properties like gravity, time scale, etc in real time and get instant result. Also You can start simulation again manually Right clicking on this button. Check OFF if you want to stop simulation and restore all objects postion.

2. Bake animation: This mode works in the same way as Preview mode, but in this case it bakes animation for simulated objects. After Time range will be simulated Physx will stop simulation. Check OFF if you want to stop simulation and restore all objects postion.

3. Pause: Check ON if You want to pause simulation and make some adjustments, like add space warps, change physical properties, etc. Check OFF to continue simulation.

4. Stop: Hit this button to stop simulation.