ISO 10303-214:2010(E)

Figure — Arrowleft Figure — Clause 4 Figure — Arrowright

4.2.312 Light_source

A Light_source is a luminous source that affects the display of surfaces within a defined Model_image.

The position of the Light_source, if specified, is defined in the coordinate space of the presented model.

The data associated with a Light_source are the following:

4.2.312.1 colour

The colour specifies the colour of a light source that is defined by the intensities of red, green, and blue proportions. The colour is either user-defined or pre-defined. Figure 23 shows the pre-defined colours.

The colour need not be specified for a particular Light_source.

4.2.312.2 is_defined_for

The is_defined_for specifies the set of Model_image objects that the Light_source is applied to.

See light_source to model_image for the application assertion.

4.2.312.3 light_type

The light_type specifies the kind of Light_source.

NOTE Position and attenuation as well as additional characteristics of the Light_source are specified dependent on the kind of Light_source.

EXAMPLE 'directional', 'positional', 'spot light', or 'ambient' are examples of the light_type.



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