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-- File: Vrml_SpotLight.cdl
-- Created: Wed Feb 12 11:19:05 1997
-- Author: Alexander BRIVIN
-- <brivin@meteox.nizhny.matra-dtv.fr>
---Copyright: Matra Datavision 1997
class SpotLight from Vrml
---Purpose: specifies a spot light node of VRML nodes specifying
-- properties of lights.
-- This node defines a spotlight light source.
-- A spotlight is placed at a fixed location in 3D-space
-- and illuminates in a cone along a particular direction.
-- The intensity of the illumination drops off exponentially
-- as a ray of light diverges from this direction toward
-- the edges of cone.
-- The rate of drop-off and agle of the cone are controlled
-- by the dropOfRate and cutOffAngle
-- Color is written as an RGB triple.
-- Light intensity must be in the range 0.0 to 1.0, inclusive.
uses
Color from Quantity,
Vec from gp
is
-- defaults :
Create returns SpotLight from Vrml;
-- myOnOff(Standard_True)
-- myIntensity(1)
-- myColor(1 1 1)
-- myLocation(0 0 1)
-- myDirection(0 0 -1)
-- myDropOffRate(0)
-- myCutOffAngle(0.785398)
Create ( aOnOff : Boolean from Standard;
aIntensity : Real from Standard;
aColor : Color from Quantity;
aLocation : Vec from gp;
aDirection : Vec from gp;
aDropOffRate : Real from Standard;
aCutOffAngle : Real from Standard )
returns SpotLight from Vrml;
SetOnOff ( me : in out; anOnOff : Boolean from Standard );
OnOff ( me ) returns Boolean from Standard;
SetIntensity ( me : in out; aIntensity : Real from Standard );
Intensity ( me ) returns Real from Standard;
SetColor ( me : in out; aColor : Color from Quantity );
Color ( me ) returns Color from Quantity;
SetLocation ( me : in out; aLocation : Vec from gp );
Location ( me ) returns Vec from gp;
SetDirection ( me : in out; aDirection : Vec from gp );
Direction ( me ) returns Vec from gp;
SetDropOffRate ( me : in out; aDropOffRate : Real from Standard );
DropOffRate ( me ) returns Real from Standard;
SetCutOffAngle ( me : in out; aCutOffAngle : Real from Standard );
CutOffAngle ( me ) returns Real from Standard;
Print ( me; anOStream: in out OStream from Standard) returns OStream from Standard;
---C++: return &
fields
myOnOff : Boolean from Standard; -- Whether light is on
myIntensity : Real from Standard; -- Source intensity (0 to 1)
myColor : Color from Quantity; -- RGB source color
myLocation : Vec from gp; -- Source location
myDirection : Vec from gp; -- Primary direction of illumination
myDropOffRate : Real from Standard; -- Rate of intensity drop-off from primary
-- direction: 0 = constant intensity,
-- 1 = sharp drop-off
myCutOffAngle : Real from Standard; -- Angle (in radians) outside of which
-- intensity is zero, measured from
-- edge of cone to other edge
end SpotLight;
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