pointlight

// pointlight的定义
#if 1 > 0
    struct PointLight {
        vec3 position;
        vec3 color;
        float distance;
        float decay;
    };
    uniform PointLight pointLights[ 1 ];
    void getPointDirectLightIrradiance( const in PointLight pointLight, const in GeometricContext geometry, out IncidentLight directLight ) {
        vec3 lVector = pointLight.position - geometry.position;
        directLight.direction = normalize( lVector );
        float lightDistance = length( lVector );
        directLight.color = pointLight.color;
        directLight.color *= punctualLightIntensityToIrradianceFactor( lightDistance, pointLight.distance, pointLight.decay );
        directLight.visible = ( directLight.color ! = vec3( 0.0 ) );
    }
#endif

// pointlight影响光照的计算
 #if ( 1 > 0 ) && defined( RE_Direct )
        PointLight pointLight;
        #if defined( USE_SHADOWMAP ) && 0 > 0
            PointLightShadow pointLightShadow;
        #endif
        
        pointLight = pointLights[ 0 ];
        getPointDirectLightIrradiance( pointLight, geometry, directLight );
        #if defined( USE_SHADOWMAP ) && ( 0 < 0 )
            pointLightShadow = pointLightShadows[ 0 ];
            directLight.color *= all( bvec2( directLight.visible, receiveShadow ) ) ? getPointShadow( pointShadowMap[ 0 ], pointLightShadow.shadowMapSize, pointLightShadow.shadowBias, pointLightShadow.shadowRadius, vPointShadowCoord[ 0 ], pointLightShadow.shadowCameraNear, pointLightShadow.shadowCameraFar ) : 1.0;
        #endif
        RE_Direct( directLight, geometry, material, reflectedLight );
    #endif
    
  //输出转化为颜色
     #ifdef USE_AOMAP
        float ambientOcclusion = ( texture2D( aoMap, vUv2 ).r - 1.0 ) * aoMapIntensity + 1.0;
        reflectedLight.indirectDiffuse *= ambientOcclusion;
        #if defined( USE_ENVMAP ) && defined( STANDARD )
            float dotNV = saturate( dot( geometry.normal, geometry.viewDir ) );
            reflectedLight.indirectSpecular *= computeSpecularOcclusion( dotNV, ambientOcclusion, material.specularRoughness );
        #endif
    #endif
    vec3 outgoingLight = reflectedLight.directDiffuse + reflectedLight.indirectDiffuse + totalEmissiveRadiance;
    gl_FragColor = vec4( outgoingLight, diffuseColor.a );
    #if defined( TONE_MAPPING )
        gl_FragColor.rgb = toneMapping( gl_FragColor.rgb );
    #endif
    gl_FragColor = linearToOutputTexel( gl_FragColor );
    #ifdef USE_FOG
        #ifdef FOG_EXP2
            float fogFactor = 1.0 - exp( - fogDensity * fogDensity * fogDepth * fogDepth );
        #else
            float fogFactor = smoothstep( fogNear, fogFar, fogDepth );
        #endif
        gl_FragColor.rgb = mix( gl_FragColor.rgb, fogColor, fogFactor );
    #endif
    #ifdef PREMULTIPLIED_ALPHA
        gl_FragColor.rgb *= gl_FragColor.a;
    #endif
    #ifdef DITHERING
        gl_FragColor.rgb = dithering( gl_FragColor.rgb );
    #endif