spotlight

SpotLight {
  exposedField SFFloat ambientIntensity  0 
  exposedField SFVec3f attenuation       1 0 0
  exposedField SFFloat beamWidth         1.570796
  exposedField SFColor color             1 1 1 
  exposedField SFFloat cutOffAngle       0.785398
  exposedField SFVec3f direction         0 0 -1
  exposedField SFFloat intensity         1  
  exposedField SFVec3f location          0 0 0  
  exposedField SFBool  on                TRUE
  exposedField SFFloat radius            100 
}

• The most computationally expensive of the lighting options
• beamWidth used for max intensity range
• cutOffAngle is added to beamwidth, nothing lit beyond this
• Fall off of light between beamWidth and beamWidth+cutOffAngle
• Best on curved surfaces
• Needs highly faceted objects to work well
• Incorrect effect on single large flat polygon as lighting calculated at vertices only
• Perhaps use a transparent 1 component texture to simulate

Example