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Help GMS escreveu:Collision Group: By default, the collision group for all physics objects is 0, and this means that they will interact as normal, which means they must have a collision event to interact (a simple comment will do to trigger the collision) otherwise no collision will be registered. However, you can also specify that an object should belong to a specific collision group. Now, by assigning objects to a positive collision group (ie: three objects are all in group "2") you are telling GameMaker: Studio that instances of these objects should always collide, even if they have nothing in their collision event, obeying the physical properties that you have assigned them and the room they are in. Conversely, if you have objects with a negative collision group (ie: four objects assigned "-1"), you are telling GameMaker: Studio that these should never collide, and any collision events between them will be ignored. Note: Using collision groups dramatically increases the processing required by the physics system and should be used only when absolutely necessary, and you should have as few groups as possible!