PhysicsMaterial Extension

Physics properties (only game physics properties are supported) are exported to something like this in ogex:

Extension (applic = "Blender", type = "PhysicsMaterial")
{
	Extension (applic = "Blender", type = "PM/type")
	{
		string {"STATIC"}
	}

	Extension (applic = "Blender", type = "PM/mass")
	{
		float {0.1}
	}

	Extension (applic = "Blender", type = "PM/collision_group")
	{
		unsigned_int16 {65535}
	}

	Extension (applic = "Blender", type = "PM/collision_mask")
	{
		unsigned_int16 {65535}
	}

	Extension (applic = "Blender", type = "PM/shape")
	{
		Extension (applic = "Blender", type = "TriangleMeshShape")
		{
			ref {$geometry1}

			Extension (applic = "Blender", type = "PM/margin")
			{
				float {0.04}
			}
		}
	}
}

PhysicsMaterial

This extension contains all attributes of a physics object. Only objects will contain this extension structure.

PM/type

PM is short for physics material. type here means the "physics type" and only contains a string which can be one of: (from the Blender Python API documentation)

• NO_COLLISION No Collision, Disable collision for this object.
• STATIC Static, Stationary object.
• DYNAMIC Dynamic, Linear physics.
• RIGID_BODY Rigid Body, Linear and angular physics.
• SOFT_BODY Soft Body, Soft body.
• OCCLUDER Occluder, Occluder for optimizing scene rendering.
• SENSOR Sensor, Collision Sensor, detects static and dynamic objects but not the other collision sensor objects.
• NAVMESH Navigation Mesh, Navigation mesh.
• CHARACTER Character, Simple kinematic physics appropriate for game characters.

PM/mass

Substructures: 1 float primitive.

Default: 1.0

Mass of the physics object.

PM/collision_group

Substructures: 1 unsigned_int16 primitive.

Default: 0x01

Collision group of the physics object found in the Blender Game physics properties panel.

PM/collision_mask

Substructures: 1 unsigned_int16 primitive.

Default: 0xFF

Collision mask of the physics object found in the Blender Game physics properties panel.

PM/shape

Collision shape of this physics object. Will only exist if the type is neither OCCLUDER or NAVMESH. Contains one extension substructure of the following:

• BoxShape specified by a float array of size 3 for the half extents.
• SphereShape specified by a float array of size 3 for the half extents.
• CylinderShape specified by a float array of size 3 for the half extents.
• ConeShape specified by a float array of size 3 for the half extents.
• ConvexHullShape specified by a ref to the objects geometry.
• TriangleMeshShape specified by a ref to the objects geometry.
• CapsuleShape specified by a float array of size 3 for the half extents.
• CompoundShape see below.

In addition to the above, the individual specific shape will also contain a PM/margin extension structure containing exactly one shape primitive which represents the collision margin for the shape.

CompoundShape

Compound shapes are specified similar to:

			Extension (applic = "Blender", type = "CompoundShape")
			{
				Extension (applic = "Blender", type = "CompoundChild")
				{
					Extension (applic = "Blender", type = "BoxShape")
					{
						float[3] {{1.0, 1.0, 1.0}}

						Extension (applic = "Blender", type = "PM/margin")
						{
							float {0.0}
						}
					}
				}

				Extension (applic = "Blender", type = "CompoundChild")
				{
					float[16]
					{
						{1.0, 0.0, 0.0, 0.0,
						 0.0, 1.0, 0.0, 0.0,
						 0.0, 0.0, 1.0, 0.0,
						 0.0, 0.0, 1.0, 1.0}
					}

					Extension (applic = "Blender", type = "SphereShape")
					{
						float {1.0}

						Extension (applic = "Blender", type = "PM/margin")
						{
							float {0.0}
						}
					}
				}
			}

They consist of a set of "CompoundChild", which have a float[16] for their relative compound child offset (may be omitted if it is an identity transformation) and a collision shape, see PM/shape.