4.3.6 Material

Any product or product type can have associated materials indicating the physical composition of an object.

EXAMPLE  An object can be comprised of a single material or a set of materials with a particular layout. Several examples include:

Materials can have representations for surface styles indicating colors, textures, and light reflectance for 3D rendering. Materials can have representations for fill styles indicating colors, tiles, and hatch patterns for 2D rendering. Materials can have properties such as density, elasticity, thermal resistance, and others as defined in this specification. Materials can also be classified according to a referenced industry standard.

EXAMPLE  Material information can also be given at object type, defining the common material data for all occurrences of the same type. It is then accessible by the inverse IsTypedBy relationship pointing via HasAssociations and via IfcRelAssociatesMaterial.RelatingMaterial to the material information. If both are given, then the material directly assigned to object occurrence overrides the material assigned to object type.

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