props.js

  this._renderState = {
    lighting: {
      ambient: {
        colors: []
      },
      specular: {
        colors: [1, 1, 1]
      },
      directional: {
        directions: [],
        colors: {
          diffuse: [],
          specular: []
        }
      },
      point: {
        positions: [],
        colors: {
          diffuse: [],
          specular: []
        }
      },
      spot: {
        positions: [],
        directions: [],
        angle: [],
        conc: [],
        colors: {
          diffuse: [],
          specular: []
        }
      }
    },
    shaders: {
      default: {
        light: undefined,
        immediate: undefined,
        normal: undefined,
        color: undefined,
        point: undefined
      },
      user: {
        fill: undefined,
        stroke: undefined,
        point: undefined
      }
    },
    stroke: {
      color: [0, 0, 0, 1],
      weight: 1,
      perspective: 1
    },
    matrices: {
      modelView: new p5.Matrix(),
      projection: new p5.Matrix(),
      normals: new p5.Matrix('mat3')
    }
  }
    
    /*********************** VS ********************/
    /**********************************************/

  this.ambientLightColors = [];
  this.specularColors = [1, 1, 1];

  this.directionalLightDirections = [];
  this.directionalLightDiffuseColors = [];
  this.directionalLightSpecularColors = [];

  this.pointLightPositions = [];
  this.pointLightDiffuseColors = [];
  this.pointLightSpecularColors = [];

  this.spotLightPositions = [];
  this.spotLightDirections = [];
  this.spotLightDiffuseColors = [];
  this.spotLightSpecularColors = [];
  this.spotLightAngle = [];
  this.spotLightConc = [];

  this.curFillColor = this._cachedFillStyle = [1, 1, 1, 1];
  this.curStrokeColor = this._cachedStrokeStyle = [0, 0, 0, 1];

  this.uMVMatrix = new p5.Matrix();
  this.uPMatrix = new p5.Matrix();
  this.uNMatrix = new p5.Matrix('mat3');

  this._defaultLightShader = undefined;
  this._defaultImmediateModeShader = undefined;
  this._defaultNormalShader = undefined;
  this._defaultColorShader = undefined;
  this._defaultPointShader = undefined;


  this.userFillShader = undefined;
  this.userStrokeShader = undefined;
  this.userPointShader = undefined;