Collision Effects
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Collision effects between objects are sometimes defined through a PhysicalMaterial reference.
Definitions asking for a Physical Material usually expect a subtypeId of a PhysicalMaterial Definition.
Then using a MaterialProperties Definition with the same subtypeId, it defines interactions with other physical materials and the produced sounds and/or particle effects.
However, not all things using a physical material will use all of the things there, some will use only particles, others will use only sounds.
In some cases (which will be marked in the element's documentation if known), the physical material subtypeId is also used to place decals, using the Decal Definition's Source or Target.
Examples for all of these can be found in sbc files with similar names of the definitions.