Collisions Rollout
 
 
 
Bottom of the Page

Utility panel reactor Collisions rollout

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.

Disabling collisions can be useful when you have objects that are attached together, such as the wheels of a car and its chassis. This means reactor doesn't check for every small collision between the objects, which can slow down the simulation.

Interface

Collisions rollout

Store Collisions
Filter Before Storing
Define Collision Pairs

Opens the Define Collisions dialog . This allows you to toggle collision detection between specified pairs of objects. Pairs of objects with disabled collisions pass through each other during the simulation.

Selected Pair: Enable

Lets you quickly enable collisions between the selected pair of objects. This button is available only when both objects are part of a collection (not necessarily the same collection) and their collisions are currently disabled.

Selected Pair: Disable

Click this button to quickly disable collisions between the selected pair of objects. This button is available only when both objects are part of a collection (not necessarily the same collection) and their collisions are currently enabled (the default condition).

Define Collisions Dialog

Entities

Lists the names of the reactor bodies in the scene (any object added to a collection). Highlighting one object populates the Enabled Collisions and Disabled Collisions lists for that object with respect to the other bodies in the scene. If you select more than one object in this list, how the Enabled/Disabled lists are populated depends on the value of Common Collisions.

Common Collisions

When on, if more than one object is highlighted in the Entities list, the Enabled and Disabled lists are populated from the list of possible pairs that can be made using only the highlighted objects. When off, the lists contain all possible pairs from the scene that contain at least one of your selected objects.

For example, take a scene containing four bodies: Box01, Box02, Box03, and Box04. If Common Collisions is on, and you then highlight Box01 and Box02 in the Entities list, then the only possible pair that just includes your selected objects is Box01<->Box02.

If you highlight Box01, Box02, and Box03, the possible pairs using these objects are Box01<->Box02, Box02<->Box03 and Box01<->Box03. If you highlight the same objects with Common Collisions off, then the lists also include the highlighted objects paired with the remaining objects in the collection. This means that the available pairs would now include Box01<->Box04, Box02<->Box04 and Box03<->Box04.

This option is on by default.

Enabled Collisions

Lists pairs with collisions enabled.

Disabled Collisions

Lists pairs with collisions disabled.

Disable Selection (Right Arrow)

Moves pairs highlighted in the Enabled list to the Disabled list.

Disable All (Double Right Arrow)

Moves all pairs in the Enabled list to the Disabled list.

Enable Selection (Left Arrow)

Moves the pairs highlighted in the Disabled list to the Enabled list.

Enable All (Double Left Arrow)

Moves all pairs in the Disabled list to the Enabled list.

OK

Closes the dialog, saving any changes carried out while the dialog was open.

Cancel

Closes the dialog without saving changes.