Logic that feeds Engine light values into the shader before a renderable is to be drawn. This module is designed to work with the engine's default shader library, although it can be used for custom shaders or replaced outright. An instance of LightLogic is always created with a Material. A unique LightLogic should only be associated with one Material at a given time. GlobalAmbient is expected to be a 3-component float vector. LightCount is expected to be an integer (or float equivalent), and the expected light list is expected to be composed of the following structure:

CopyC#

//Light struct that represents a Point, Spot, or Directional
//light. Point lights are with a 180 degree inner/outer angle,
//and directional lights have their position's w = 1.0 .
struct Light {
  //Color properties
  float3 Ambient;
  float3 Diffuse;
  float3 Specular;

  //Attenuation properties
  bool Attenuate;
  float Constant;
  float Linear;
  float Quadratic;

  //Positional (in world space) properties
  float4 Position; //Note: w = 1 means direction is used
  float3 Direction;
  float InnerAngle;
  float OuterAngle;
};

public class LightLogic : BaseMaterialLogic