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16.90.5.27 - lightsource (SceneScript element)

 <lightsource 0/1

This language element may be used inside a  <trait block.

The parameter is an integer, either 0 or 1.

This language element allows you to define an object as a light source; this means that you can put a light inside it, and the light will come through the object. This is useful for making suns, light bulbs, candles, panel lamps, any object that would emit light.

Normally, objects in the tracer block light — so for the special case where one is to emit light, you need to use  <lightsource 1 to make it work. You should remember to use  <lightsource 0 to turn the option back off, or else make use of the  <stack and  <unstack (or their various synonyms,  <push,  <pop and  <pull) commands to save and restore the environment so that all objects defined afterwards do not also pass light.

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