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VectorGraphics :: Light

Light -- A source of light

Description

A source of light for a 3d SVG picture. This corresponds to the SVG "specular" lighting, use the property Specular. The location is given by Center. By default a Light is invisible (it has opacity 0) and is unaffected by matrix transformations outside it (Static true).

i1 : Light{Radius=>10,"opacity"=>"1","fill"=>"yellow"}

o1 = Light{Blur => .3           }
           cache => CacheTable{}
           Center => | 0 |
                     | 0 |
                     | 0 |
                     | 1 |
           fill => yellow
           Is3d => true
           opacity => 1
           Radius => 10
           Specular => 64
           Static => true
           stroke => none

o1 : Light
i2 : v={(74.5571, 52.0137, -41.6631),(27.2634, -29.9211, 91.4409),(-81.3041, 57.8325, 6.71156),(-20.5165, -79.9251, -56.4894)};
i3 : f={{v#2,v#1,v#0},{v#0,v#1,v#3},{v#0,v#3,v#2},{v#1,v#2,v#3}};
i4 : c={"red","green","blue","yellow"};
i5 : tetra=gList(apply(4,i->Polygon{f#i,"fill"=>c#i,"stroke"=>"none"}),
         Light{(110,0,0),Radius=>10,"opacity"=>"1"},ViewPort=>{(-110,-100),(110,100)},
         SizeY=>30,TransformMatrix=>rotation(-1.5,(4,1,0)))

o5 = tetra

o5 : GraphicsList

Caveat

Do not use the same Light object multiple times in a given GraphicsList.

For the programmer

The object Light is an instance of the type GraphicsType, with ancestor classes Circle < GraphicsObject < HashTable < Thing.