Axiom.SceneManagers.Bsp.TextureLight.CalculateForPointLight C# (CSharp) Method

		protected bool CalculateForPointLight( Plane plane, Vector3[] vertices, out Vector2[] texCoors, out ColorEx[] colors )
		{
			texCoors = new Vector2[ vertices.Length ];
			colors = new ColorEx[ vertices.Length ];

			Vector3 lightPos, faceLightPos;

			lightPos = this.DerivedPosition;

			float dist = plane.GetDistance( lightPos );
			if ( Utility.Abs( dist ) < range )
			{
				// light is visible

				//light pos on face
				faceLightPos = lightPos - plane.Normal * dist;

				Vector3 verAxis = plane.Normal.Perpendicular();
				Vector3 horAxis = verAxis.Cross( plane.Normal );
				Plane verPlane = new Plane( verAxis, faceLightPos );
				Plane horPlane = new Plane( horAxis, faceLightPos );

				float lightRadiusSqr = range * range;
				float relRadiusSqr = lightRadiusSqr - dist * dist;
				float relRadius = Utility.Sqrt( relRadiusSqr );
				float scale = 0.5f / relRadius;

				float brightness = relRadiusSqr / lightRadiusSqr;
				ColorEx lightCol = new ColorEx( brightness * textureColor.a,
					textureColor.r, textureColor.g, textureColor.b );

				for ( int i = 0; i < vertices.Length; i++ )
				{
					texCoors[ i ].x = horPlane.GetDistance( vertices[ i ] ) * scale + 0.5f;
					texCoors[ i ].y = verPlane.GetDistance( vertices[ i ] ) * scale + 0.5f;
					colors[ i ] = lightCol;
				}

				return true;
			}

			return false;
		}