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shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","const ambientLight = new THREE.AmbientLight(0xffffff, 0.5); // 环境光\nconst directionalLight = new THREE.DirectionalLight(0xffffff, 1.5); // 平行光\nconst pointLight = new THREE.PointLight(0xffffff, 30); // 点光源\n","js","",[1577,1638,1639,1691,1725],{"__ignoreMap":1636},[1640,1641,1644,1648,1652,1656,1659,1662,1665,1668,1671,1675,1678,1681,1684,1687],"span",{"class":1642,"line":1643},"line",1,[1640,1645,1647],{"class":1646},"s50WR","const",[1640,1649,1651],{"class":1650},"sndM8"," ambientLight ",[1640,1653,1655],{"class":1654},"s86vT","=",[1640,1657,1658],{"class":1654}," new",[1640,1660,1661],{"class":1650}," THREE",[1640,1663,1664],{"class":1654},".",[1640,1666,1579],{"class":1667},"swgpB",[1640,1669,1670],{"class":1650},"(",[1640,1672,1674],{"class":1673},"smPcV","0xffffff",[1640,1676,1677],{"class":1654},",",[1640,1679,1680],{"class":1673}," 0.5",[1640,1682,1683],{"class":1650},")",[1640,1685,1686],{"class":1654},";",[1640,1688,1690],{"class":1689},"syuKq"," // 环境光\n",[1640,1692,1694,1696,1699,1701,1703,1705,1707,1709,1711,1713,1715,1718,1720,1722],{"class":1642,"line":1693},2,[1640,1695,1647],{"class":1646},[1640,1697,1698],{"class":1650}," directionalLight ",[1640,1700,1655],{"class":1654},[1640,1702,1658],{"class":1654},[1640,1704,1661],{"class":1650},[1640,1706,1664],{"class":1654},[1640,1708,1595],{"class":1667},[1640,1710,1670],{"class":1650},[1640,1712,1674],{"class":1673},[1640,1714,1677],{"class":1654},[1640,1716,1717],{"class":1673}," 1.5",[1640,1719,1683],{"class":1650},[1640,1721,1686],{"class":1654},[1640,1723,1724],{"class":1689}," // 平行光\n",[1640,1726,1728,1730,1733,1735,1737,1739,1741,1743,1745,1747,1749,1752,1754,1756],{"class":1642,"line":1727},3,[1640,1729,1647],{"class":1646},[1640,1731,1732],{"class":1650}," pointLight ",[1640,1734,1655],{"class":1654},[1640,1736,1658],{"class":1654},[1640,1738,1661],{"class":1650},[1640,1740,1664],{"class":1654},[1640,1742,1611],{"class":1667},[1640,1744,1670],{"class":1650},[1640,1746,1674],{"class":1673},[1640,1748,1677],{"class":1654},[1640,1750,1751],{"class":1673}," 30",[1640,1753,1683],{"class":1650},[1640,1755,1686],{"class":1654},[1640,1757,1758],{"class":1689}," // 点光源\n",[1530,1760,1761],{},"环境光没有方向，放进场景就生效；平行光和点光源需要设置位置：",[1631,1763,1765],{"className":1633,"code":1764,"language":1635,"meta":1636,"style":1636},"directionalLight.position.set(3, 5, 4); // 从右上方斜照下来\npointLight.position.set(2, 3, 2); // 挂在这个坐标的“灯泡”\n",[1577,1766,1767,1804],{"__ignoreMap":1636},[1640,1768,1769,1772,1774,1777,1779,1782,1784,1787,1789,1792,1794,1797,1799,1801],{"class":1642,"line":1643},[1640,1770,1771],{"class":1650},"directionalLight",[1640,1773,1664],{"class":1654},[1640,1775,1776],{"class":1650},"position",[1640,1778,1664],{"class":1654},[1640,1780,1781],{"class":1667},"set",[1640,1783,1670],{"class":1650},[1640,1785,1786],{"class":1673},"3",[1640,1788,1677],{"class":1654},[1640,1790,1791],{"class":1673}," 5",[1640,1793,1677],{"class":1654},[1640,1795,1796],{"class":1673}," 4",[1640,1798,1683],{"class":1650},[1640,1800,1686],{"class":1654},[1640,1802,1803],{"class":1689}," // 从右上方斜照下来\n",[1640,1805,1806,1809,1811,1813,1815,1817,1819,1822,1824,1827,1829,1832,1834,1836],{"class":1642,"line":1693},[1640,1807,1808],{"class":1650},"pointLight",[1640,1810,1664],{"class":1654},[1640,1812,1776],{"class":1650},[1640,1814,1664],{"class":1654},[1640,1816,1781],{"class":1667},[1640,1818,1670],{"class":1650},[1640,1820,1821],{"class":1673},"2",[1640,1823,1677],{"class":1654},[1640,1825,1826],{"class":1673}," 3",[1640,1828,1677],{"class":1654},[1640,1830,1831],{"class":1673}," 2",[1640,1833,1683],{"class":1650},[1640,1835,1686],{"class":1654},[1640,1837,1838],{"class":1689}," // 挂在这个坐标的“灯泡”\n",[1840,1841,1842],"warning",{},[1530,1843,1844,1845,1848,1849,1852],{},"点光源的强度量级和前两种光不同：新版 Three.js 中点光源按物理距离衰减，亮度掉得很快，",[1577,1846,1847],{},"30"," 这类偏大的值才够亮。平行光和环境光的强度一般在 ",[1577,1850,1851],{},"0.5 ~ 2"," 之间调整。",[1534,1854],{},[1525,1856,1858],{"id":1857},"组合布光环境光打底-平行光主光源","🛠 组合布光：环境光打底 + 平行光主光源",[1530,1860,1861],{},"只用平行光，背光面会黑得看不清；只用环境光，画面平得像纸片。实际开发中的常用套路是两种光配合：",[1863,1864,1865,1871],"ul",{},[1866,1867,1868,1870],"li",{},[1622,1869,1573],{},"：低强度，负责把背光面“兜底”提亮。",[1866,1872,1873,1875],{},[1622,1874,1590],{},"：高强度，负责制造明暗层次，当主光源。",[1631,1877,1879],{"className":1633,"code":1878,"language":1635,"meta":1636,"style":1636},"// 环境光打底：强度低一点\nscene.add(new THREE.AmbientLight(0xffffff, 0.4));\n\n// 平行光当主光源：从右上方照下来\nconst directionalLight = new THREE.DirectionalLight(0xffffff, 1.5);\ndirectionalLight.position.set(3, 5, 4);\nscene.add(directionalLight);\n",[1577,1880,1881,1886,1922,1928,1934,1963,1992],{"__ignoreMap":1636},[1640,1882,1883],{"class":1642,"line":1643},[1640,1884,1885],{"class":1689},"// 环境光打底：强度低一点\n",[1640,1887,1888,1891,1893,1896,1898,1901,1903,1905,1907,1909,1911,1913,1916,1919],{"class":1642,"line":1693},[1640,1889,1890],{"class":1650},"scene",[1640,1892,1664],{"class":1654},[1640,1894,1895],{"class":1667},"add",[1640,1897,1670],{"class":1650},[1640,1899,1900],{"class":1654},"new",[1640,1902,1661],{"class":1650},[1640,1904,1664],{"class":1654},[1640,1906,1579],{"class":1667},[1640,1908,1670],{"class":1650},[1640,1910,1674],{"class":1673},[1640,1912,1677],{"class":1654},[1640,1914,1915],{"class":1673}," 0.4",[1640,1917,1918],{"class":1650},"))",[1640,1920,1921],{"class":1654},";\n",[1640,1923,1924],{"class":1642,"line":1727},[1640,1925,1927],{"emptyLinePlaceholder":1926},true,"\n",[1640,1929,1931],{"class":1642,"line":1930},4,[1640,1932,1933],{"class":1689},"// 平行光当主光源：从右上方照下来\n",[1640,1935,1937,1939,1941,1943,1945,1947,1949,1951,1953,1955,1957,1959,1961],{"class":1642,"line":1936},5,[1640,1938,1647],{"class":1646},[1640,1940,1698],{"class":1650},[1640,1942,1655],{"class":1654},[1640,1944,1658],{"class":1654},[1640,1946,1661],{"class":1650},[1640,1948,1664],{"class":1654},[1640,1950,1595],{"class":1667},[1640,1952,1670],{"class":1650},[1640,1954,1674],{"class":1673},[1640,1956,1677],{"class":1654},[1640,1958,1717],{"class":1673},[1640,1960,1683],{"class":1650},[1640,1962,1921],{"class":1654},[1640,1964,1966,1968,1970,1972,1974,1976,1978,1980,1982,1984,1986,1988,1990],{"class":1642,"line":1965},6,[1640,1967,1771],{"class":1650},[1640,1969,1664],{"class":1654},[1640,1971,1776],{"class":1650},[1640,1973,1664],{"class":1654},[1640,1975,1781],{"class":1667},[1640,1977,1670],{"class":1650},[1640,1979,1786],{"class":1673},[1640,1981,1677],{"class":1654},[1640,1983,1791],{"class":1673},[1640,1985,1677],{"class":1654},[1640,1987,1796],{"class":1673},[1640,1989,1683],{"class":1650},[1640,1991,1921],{"class":1654},[1640,1993,1995,1997,1999,2001,2004],{"class":1642,"line":1994},7,[1640,1996,1890],{"class":1650},[1640,1998,1664],{"class":1654},[1640,2000,1895],{"class":1667},[1640,2002,2003],{"class":1650},"(directionalLight)",[1640,2005,1921],{"class":1654},[1530,2007,2008],{},"下面是对比效果：左边只有平行光，背光面接近全黑；右边加上环境光后，背光面也能看清轮廓：",[2010,2011],"three-light-demo",{},[1534,2013],{},[1525,2015,2017],{"id":2016},"给场景加上阴影","🧱 给场景加上阴影",[1530,2019,2020],{},"有了光，自然就有影子。Three.js 的阴影默认是关闭的，需要三步手动开启：",[1631,2022,2024],{"className":1633,"code":2023,"language":1635,"meta":1636,"style":1636},"// 1. 渲染器开启阴影贴图\nrenderer.shadowMap.enabled = true;\n\n// 2. 灯光声明“产生阴影”\ndirectionalLight.castShadow = true;\n\n// 3. 物体声明“投出阴影”或“接收阴影”\ncube.castShadow = true; // 立方体投出阴影\nplane.receiveShadow = true; // 地面接收阴影\n",[1577,2025,2026,2031,2054,2058,2063,2078,2082,2087,2106],{"__ignoreMap":1636},[1640,2027,2028],{"class":1642,"line":1643},[1640,2029,2030],{"class":1689},"// 1. 渲染器开启阴影贴图\n",[1640,2032,2033,2036,2038,2041,2043,2046,2048,2052],{"class":1642,"line":1693},[1640,2034,2035],{"class":1650},"renderer",[1640,2037,1664],{"class":1654},[1640,2039,2040],{"class":1650},"shadowMap",[1640,2042,1664],{"class":1654},[1640,2044,2045],{"class":1650},"enabled ",[1640,2047,1655],{"class":1654},[1640,2049,2051],{"class":2050},"sPKOg"," true",[1640,2053,1921],{"class":1654},[1640,2055,2056],{"class":1642,"line":1727},[1640,2057,1927],{"emptyLinePlaceholder":1926},[1640,2059,2060],{"class":1642,"line":1930},[1640,2061,2062],{"class":1689},"// 2. 灯光声明“产生阴影”\n",[1640,2064,2065,2067,2069,2072,2074,2076],{"class":1642,"line":1936},[1640,2066,1771],{"class":1650},[1640,2068,1664],{"class":1654},[1640,2070,2071],{"class":1650},"castShadow ",[1640,2073,1655],{"class":1654},[1640,2075,2051],{"class":2050},[1640,2077,1921],{"class":1654},[1640,2079,2080],{"class":1642,"line":1965},[1640,2081,1927],{"emptyLinePlaceholder":1926},[1640,2083,2084],{"class":1642,"line":1994},[1640,2085,2086],{"class":1689},"// 3. 物体声明“投出阴影”或“接收阴影”\n",[1640,2088,2090,2093,2095,2097,2099,2101,2103],{"class":1642,"line":2089},8,[1640,2091,2092],{"class":1650},"cube",[1640,2094,1664],{"class":1654},[1640,2096,2071],{"class":1650},[1640,2098,1655],{"class":1654},[1640,2100,2051],{"class":2050},[1640,2102,1686],{"class":1654},[1640,2104,2105],{"class":1689}," // 立方体投出阴影\n",[1640,2107,2109,2112,2114,2117,2119,2121,2123],{"class":1642,"line":2108},9,[1640,2110,2111],{"class":1650},"plane",[1640,2113,1664],{"class":1654},[1640,2115,2116],{"class":1650},"receiveShadow ",[1640,2118,1655],{"class":1654},[1640,2120,2051],{"class":2050},[1640,2122,1686],{"class":1654},[1640,2124,2125],{"class":1689}," // 地面接收阴影\n",[1530,2127,2128],{},"完整示例：一个悬空的立方体，影子投在地面上：",[1631,2130,2132],{"className":1633,"code":2131,"language":1635,"meta":1636,"style":1636},"const scene = new THREE.Scene();\nconst camera = new THREE.PerspectiveCamera(75, 320 / 240, 0.1, 1000);\ncamera.position.set(2, 2, 4);\ncamera.lookAt(0, 0, 0);\n\nscene.add(new THREE.AmbientLight(0xffffff, 0.4));\nconst directionalLight = new THREE.DirectionalLight(0xffffff, 1.5);\ndirectionalLight.position.set(3, 5, 4);\ndirectionalLight.castShadow = true;\nscene.add(directionalLight);\n\n// 悬空的立方体\nconst cube = new THREE.Mesh(\n    new THREE.BoxGeometry(1, 1, 1),\n    new THREE.MeshStandardMaterial({ color: 0x44aa88 })\n);\ncube.position.y = 0.8;\ncube.castShadow = true;\nscene.add(cube);\n\n// 地面：用一个大平面充当\nconst plane = new THREE.Mesh(\n    new THREE.PlaneGeometry(6, 6),\n    new THREE.MeshStandardMaterial({ color: 0xdddddd })\n);\nplane.rotation.x = -Math.PI / 2; // 平面默认竖着，转成水平\nplane.position.y = -0.5;\nplane.receiveShadow = true;\nscene.add(plane);\n\nconst renderer = new THREE.WebGLRenderer({ antialias: true });\nrenderer.setSize(320, 240);\nrenderer.shadowMap.enabled = true; // 别忘了渲染器这一步\ncontainerRef.value.appendChild(renderer.domElement);\nrenderer.render(scene, camera);\n",[1577,2133,2134,2157,2205,2234,2261,2265,2295,2323,2351,2365,2378,2383,2389,2411,2443,2476,2483,2504,2519,2533,2538,2544,2564,2590,2616,2623,2661,2683,2698,2712,2717,2753,2776,2798,2824],{"__ignoreMap":1636},[1640,2135,2136,2138,2141,2143,2145,2147,2149,2152,2155],{"class":1642,"line":1643},[1640,2137,1647],{"class":1646},[1640,2139,2140],{"class":1650}," scene ",[1640,2142,1655],{"class":1654},[1640,2144,1658],{"class":1654},[1640,2146,1661],{"class":1650},[1640,2148,1664],{"class":1654},[1640,2150,2151],{"class":1667},"Scene",[1640,2153,2154],{"class":1650},"()",[1640,2156,1921],{"class":1654},[1640,2158,2159,2161,2164,2166,2168,2170,2172,2175,2177,2180,2182,2185,2188,2191,2193,2196,2198,2201,2203],{"class":1642,"line":1693},[1640,2160,1647],{"class":1646},[1640,2162,2163],{"class":1650}," camera ",[1640,2165,1655],{"class":1654},[1640,2167,1658],{"class":1654},[1640,2169,1661],{"class":1650},[1640,2171,1664],{"class":1654},[1640,2173,2174],{"class":1667},"PerspectiveCamera",[1640,2176,1670],{"class":1650},[1640,2178,2179],{"class":1673},"75",[1640,2181,1677],{"class":1654},[1640,2183,2184],{"class":1673}," 320",[1640,2186,2187],{"class":1654}," /",[1640,2189,2190],{"class":1673}," 240",[1640,2192,1677],{"class":1654},[1640,2194,2195],{"class":1673}," 0.1",[1640,2197,1677],{"class":1654},[1640,2199,2200],{"class":1673}," 1000",[1640,2202,1683],{"class":1650},[1640,2204,1921],{"class":1654},[1640,2206,2207,2210,2212,2214,2216,2218,2220,2222,2224,2226,2228,2230,2232],{"class":1642,"line":1727},[1640,2208,2209],{"class":1650},"camera",[1640,2211,1664],{"class":1654},[1640,2213,1776],{"class":1650},[1640,2215,1664],{"class":1654},[1640,2217,1781],{"class":1667},[1640,2219,1670],{"class":1650},[1640,2221,1821],{"class":1673},[1640,2223,1677],{"class":1654},[1640,2225,1831],{"class":1673},[1640,2227,1677],{"class":1654},[1640,2229,1796],{"class":1673},[1640,2231,1683],{"class":1650},[1640,2233,1921],{"class":1654},[1640,2235,2236,2238,2240,2243,2245,2248,2250,2253,2255,2257,2259],{"class":1642,"line":1930},[1640,2237,2209],{"class":1650},[1640,2239,1664],{"class":1654},[1640,2241,2242],{"class":1667},"lookAt",[1640,2244,1670],{"class":1650},[1640,2246,2247],{"class":1673},"0",[1640,2249,1677],{"class":1654},[1640,2251,2252],{"class":1673}," 0",[1640,2254,1677],{"class":1654},[1640,2256,2252],{"class":1673},[1640,2258,1683],{"class":1650},[1640,2260,1921],{"class":1654},[1640,2262,2263],{"class":1642,"line":1936},[1640,2264,1927],{"emptyLinePlaceholder":1926},[1640,2266,2267,2269,2271,2273,2275,2277,2279,2281,2283,2285,2287,2289,2291,2293],{"class":1642,"line":1965},[1640,2268,1890],{"class":1650},[1640,2270,1664],{"class":1654},[1640,2272,1895],{"class":1667},[1640,2274,1670],{"class":1650},[1640,2276,1900],{"class":1654},[1640,2278,1661],{"class":1650},[1640,2280,1664],{"class":1654},[1640,2282,1579],{"class":1667},[1640,2284,1670],{"class":1650},[1640,2286,1674],{"class":1673},[1640,2288,1677],{"class":1654},[1640,2290,1915],{"class":1673},[1640,2292,1918],{"class":1650},[1640,2294,1921],{"class":1654},[1640,2296,2297,2299,2301,2303,2305,2307,2309,2311,2313,2315,2317,2319,2321],{"class":1642,"line":1994},[1640,2298,1647],{"class":1646},[1640,2300,1698],{"class":1650},[1640,2302,1655],{"class":1654},[1640,2304,1658],{"class":1654},[1640,2306,1661],{"class":1650},[1640,2308,1664],{"class":1654},[1640,2310,1595],{"class":1667},[1640,2312,1670],{"class":1650},[1640,2314,1674],{"class":1673},[1640,2316,1677],{"class":1654},[1640,2318,1717],{"class":1673},[1640,2320,1683],{"class":1650},[1640,2322,1921],{"class":1654},[1640,2324,2325,2327,2329,2331,2333,2335,2337,2339,2341,2343,2345,2347,2349],{"class":1642,"line":2089},[1640,2326,1771],{"class":1650},[1640,2328,1664],{"class":1654},[1640,2330,1776],{"class":1650},[1640,2332,1664],{"class":1654},[1640,2334,1781],{"class":1667},[1640,2336,1670],{"class":1650},[1640,2338,1786],{"class":1673},[1640,2340,1677],{"class":1654},[1640,2342,1791],{"class":1673},[1640,2344,1677],{"class":1654},[1640,2346,1796],{"class":1673},[1640,2348,1683],{"class":1650},[1640,2350,1921],{"class":1654},[1640,2352,2353,2355,2357,2359,2361,2363],{"class":1642,"line":2108},[1640,2354,1771],{"class":1650},[1640,2356,1664],{"class":1654},[1640,2358,2071],{"class":1650},[1640,2360,1655],{"class":1654},[1640,2362,2051],{"class":2050},[1640,2364,1921],{"class":1654},[1640,2366,2368,2370,2372,2374,2376],{"class":1642,"line":2367},10,[1640,2369,1890],{"class":1650},[1640,2371,1664],{"class":1654},[1640,2373,1895],{"class":1667},[1640,2375,2003],{"class":1650},[1640,2377,1921],{"class":1654},[1640,2379,2381],{"class":1642,"line":2380},11,[1640,2382,1927],{"emptyLinePlaceholder":1926},[1640,2384,2386],{"class":1642,"line":2385},12,[1640,2387,2388],{"class":1689},"// 悬空的立方体\n",[1640,2390,2392,2394,2397,2399,2401,2403,2405,2408],{"class":1642,"line":2391},13,[1640,2393,1647],{"class":1646},[1640,2395,2396],{"class":1650}," cube ",[1640,2398,1655],{"class":1654},[1640,2400,1658],{"class":1654},[1640,2402,1661],{"class":1650},[1640,2404,1664],{"class":1654},[1640,2406,2407],{"class":1667},"Mesh",[1640,2409,2410],{"class":1650},"(\n",[1640,2412,2414,2417,2419,2421,2424,2426,2429,2431,2434,2436,2438,2440],{"class":1642,"line":2413},14,[1640,2415,2416],{"class":1654},"    new",[1640,2418,1661],{"class":1650},[1640,2420,1664],{"class":1654},[1640,2422,2423],{"class":1667},"BoxGeometry",[1640,2425,1670],{"class":1650},[1640,2427,2428],{"class":1673},"1",[1640,2430,1677],{"class":1654},[1640,2432,2433],{"class":1673}," 1",[1640,2435,1677],{"class":1654},[1640,2437,2433],{"class":1673},[1640,2439,1683],{"class":1650},[1640,2441,2442],{"class":1654},",\n",[1640,2444,2446,2448,2450,2452,2455,2457,2460,2464,2467,2470,2473],{"class":1642,"line":2445},15,[1640,2447,2416],{"class":1654},[1640,2449,1661],{"class":1650},[1640,2451,1664],{"class":1654},[1640,2453,2454],{"class":1667},"MeshStandardMaterial",[1640,2456,1670],{"class":1650},[1640,2458,2459],{"class":1654},"{",[1640,2461,2463],{"class":2462},"sd2Uz"," color",[1640,2465,2466],{"class":1654},":",[1640,2468,2469],{"class":1673}," 0x44aa88",[1640,2471,2472],{"class":1654}," }",[1640,2474,2475],{"class":1650},")\n",[1640,2477,2479,2481],{"class":1642,"line":2478},16,[1640,2480,1683],{"class":1650},[1640,2482,1921],{"class":1654},[1640,2484,2486,2488,2490,2492,2494,2497,2499,2502],{"class":1642,"line":2485},17,[1640,2487,2092],{"class":1650},[1640,2489,1664],{"class":1654},[1640,2491,1776],{"class":1650},[1640,2493,1664],{"class":1654},[1640,2495,2496],{"class":1650},"y ",[1640,2498,1655],{"class":1654},[1640,2500,2501],{"class":1673}," 0.8",[1640,2503,1921],{"class":1654},[1640,2505,2507,2509,2511,2513,2515,2517],{"class":1642,"line":2506},18,[1640,2508,2092],{"class":1650},[1640,2510,1664],{"class":1654},[1640,2512,2071],{"class":1650},[1640,2514,1655],{"class":1654},[1640,2516,2051],{"class":2050},[1640,2518,1921],{"class":1654},[1640,2520,2522,2524,2526,2528,2531],{"class":1642,"line":2521},19,[1640,2523,1890],{"class":1650},[1640,2525,1664],{"class":1654},[1640,2527,1895],{"class":1667},[1640,2529,2530],{"class":1650},"(cube)",[1640,2532,1921],{"class":1654},[1640,2534,2536],{"class":1642,"line":2535},20,[1640,2537,1927],{"emptyLinePlaceholder":1926},[1640,2539,2541],{"class":1642,"line":2540},21,[1640,2542,2543],{"class":1689},"// 地面：用一个大平面充当\n",[1640,2545,2547,2549,2552,2554,2556,2558,2560,2562],{"class":1642,"line":2546},22,[1640,2548,1647],{"class":1646},[1640,2550,2551],{"class":1650}," plane ",[1640,2553,1655],{"class":1654},[1640,2555,1658],{"class":1654},[1640,2557,1661],{"class":1650},[1640,2559,1664],{"class":1654},[1640,2561,2407],{"class":1667},[1640,2563,2410],{"class":1650},[1640,2565,2567,2569,2571,2573,2576,2578,2581,2583,2586,2588],{"class":1642,"line":2566},23,[1640,2568,2416],{"class":1654},[1640,2570,1661],{"class":1650},[1640,2572,1664],{"class":1654},[1640,2574,2575],{"class":1667},"PlaneGeometry",[1640,2577,1670],{"class":1650},[1640,2579,2580],{"class":1673},"6",[1640,2582,1677],{"class":1654},[1640,2584,2585],{"class":1673}," 6",[1640,2587,1683],{"class":1650},[1640,2589,2442],{"class":1654},[1640,2591,2593,2595,2597,2599,2601,2603,2605,2607,2609,2612,2614],{"class":1642,"line":2592},24,[1640,2594,2416],{"class":1654},[1640,2596,1661],{"class":1650},[1640,2598,1664],{"class":1654},[1640,2600,2454],{"class":1667},[1640,2602,1670],{"class":1650},[1640,2604,2459],{"class":1654},[1640,2606,2463],{"class":2462},[1640,2608,2466],{"class":1654},[1640,2610,2611],{"class":1673}," 0xdddddd",[1640,2613,2472],{"class":1654},[1640,2615,2475],{"class":1650},[1640,2617,2619,2621],{"class":1642,"line":2618},25,[1640,2620,1683],{"class":1650},[1640,2622,1921],{"class":1654},[1640,2624,2626,2628,2630,2633,2635,2638,2640,2643,2646,2648,2651,2654,2656,2658],{"class":1642,"line":2625},26,[1640,2627,2111],{"class":1650},[1640,2629,1664],{"class":1654},[1640,2631,2632],{"class":1650},"rotation",[1640,2634,1664],{"class":1654},[1640,2636,2637],{"class":1650},"x ",[1640,2639,1655],{"class":1654},[1640,2641,2642],{"class":1654}," -",[1640,2644,2645],{"class":1650},"Math",[1640,2647,1664],{"class":1654},[1640,2649,2650],{"class":1650},"PI ",[1640,2652,2653],{"class":1654},"/",[1640,2655,1831],{"class":1673},[1640,2657,1686],{"class":1654},[1640,2659,2660],{"class":1689}," // 平面默认竖着，转成水平\n",[1640,2662,2664,2666,2668,2670,2672,2674,2676,2678,2681],{"class":1642,"line":2663},27,[1640,2665,2111],{"class":1650},[1640,2667,1664],{"class":1654},[1640,2669,1776],{"class":1650},[1640,2671,1664],{"class":1654},[1640,2673,2496],{"class":1650},[1640,2675,1655],{"class":1654},[1640,2677,2642],{"class":1654},[1640,2679,2680],{"class":1673},"0.5",[1640,2682,1921],{"class":1654},[1640,2684,2686,2688,2690,2692,2694,2696],{"class":1642,"line":2685},28,[1640,2687,2111],{"class":1650},[1640,2689,1664],{"class":1654},[1640,2691,2116],{"class":1650},[1640,2693,1655],{"class":1654},[1640,2695,2051],{"class":2050},[1640,2697,1921],{"class":1654},[1640,2699,2701,2703,2705,2707,2710],{"class":1642,"line":2700},29,[1640,2702,1890],{"class":1650},[1640,2704,1664],{"class":1654},[1640,2706,1895],{"class":1667},[1640,2708,2709],{"class":1650},"(plane)",[1640,2711,1921],{"class":1654},[1640,2713,2715],{"class":1642,"line":2714},30,[1640,2716,1927],{"emptyLinePlaceholder":1926},[1640,2718,2720,2722,2725,2727,2729,2731,2733,2736,2738,2740,2743,2745,2747,2749,2751],{"class":1642,"line":2719},31,[1640,2721,1647],{"class":1646},[1640,2723,2724],{"class":1650}," renderer ",[1640,2726,1655],{"class":1654},[1640,2728,1658],{"class":1654},[1640,2730,1661],{"class":1650},[1640,2732,1664],{"class":1654},[1640,2734,2735],{"class":1667},"WebGLRenderer",[1640,2737,1670],{"class":1650},[1640,2739,2459],{"class":1654},[1640,2741,2742],{"class":2462}," antialias",[1640,2744,2466],{"class":1654},[1640,2746,2051],{"class":2050},[1640,2748,2472],{"class":1654},[1640,2750,1683],{"class":1650},[1640,2752,1921],{"class":1654},[1640,2754,2756,2758,2760,2763,2765,2768,2770,2772,2774],{"class":1642,"line":2755},32,[1640,2757,2035],{"class":1650},[1640,2759,1664],{"class":1654},[1640,2761,2762],{"class":1667},"setSize",[1640,2764,1670],{"class":1650},[1640,2766,2767],{"class":1673},"320",[1640,2769,1677],{"class":1654},[1640,2771,2190],{"class":1673},[1640,2773,1683],{"class":1650},[1640,2775,1921],{"class":1654},[1640,2777,2779,2781,2783,2785,2787,2789,2791,2793,2795],{"class":1642,"line":2778},33,[1640,2780,2035],{"class":1650},[1640,2782,1664],{"class":1654},[1640,2784,2040],{"class":1650},[1640,2786,1664],{"class":1654},[1640,2788,2045],{"class":1650},[1640,2790,1655],{"class":1654},[1640,2792,2051],{"class":2050},[1640,2794,1686],{"class":1654},[1640,2796,2797],{"class":1689}," // 别忘了渲染器这一步\n",[1640,2799,2801,2804,2806,2809,2811,2814,2817,2819,2822],{"class":1642,"line":2800},34,[1640,2802,2803],{"class":1650},"containerRef",[1640,2805,1664],{"class":1654},[1640,2807,2808],{"class":1650},"value",[1640,2810,1664],{"class":1654},[1640,2812,2813],{"class":1667},"appendChild",[1640,2815,2816],{"class":1650},"(renderer",[1640,2818,1664],{"class":1654},[1640,2820,2821],{"class":1650},"domElement)",[1640,2823,1921],{"class":1654},[1640,2825,2827,2829,2831,2834,2837,2839,2842],{"class":1642,"line":2826},35,[1640,2828,2035],{"class":1650},[1640,2830,1664],{"class":1654},[1640,2832,2833],{"class":1667},"render",[1640,2835,2836],{"class":1650},"(scene",[1640,2838,1677],{"class":1654},[1640,2840,2841],{"class":1650}," camera)",[1640,2843,1921],{"class":1654},[1530,2845,2846],{},"代码里两个新面孔解释一下：",[1863,2848,2849,2855],{},[1866,2850,2851,2854],{},[1577,2852,2853],{},"camera.lookAt(0, 0, 0)","：让相机转头盯住原点，不管相机摆在哪都朝向场景中心。",[1866,2856,2857,2860],{},[1577,2858,2859],{},"plane.rotation.x = -Math.PI / 2","：新建的平面是竖立的（正对着相机），绕 x 轴转 90° 才平躺在地上。",[1530,2862,2863,2864,2867],{},"下面是这段代码的",[1622,2865,2866],{},"真实渲染效果","，注意立方体投在地面上的影子：",[2869,2870],"three-shadow-demo",{},[2872,2873,2874],"tip",{},[1530,2875,2876,2877,2880],{},"阴影是有渲染开销的。场景很大或物体很多时，可以只让关键物体 ",[1577,2878,2879],{},"castShadow","，小物件不投影，兼顾效果和性能。",[1534,2882],{},[1525,2884,2886],{"id":2885},"小节总结","🧾 小节总结",[1863,2888,2889,2892,2895,2898,2914],{},[1866,2890,2891],{},"三种常用灯光：环境光（均匀兜底）、平行光（像太阳，当主光源）、点光源（像灯泡）。",[1866,2893,2894],{},"组合套路：低强度环境光打底 + 高强度平行光制造层次。",[1866,2896,2897],{},"点光源按物理距离衰减，强度要给得比平行光大很多。",[1866,2899,2900,2901,2904,2905,2907,2908,2910,2911,1629],{},"阴影三步开启：渲染器 ",[1577,2902,2903],{},"shadowMap.enabled","、灯光 ",[1577,2906,2879],{},"、物体 ",[1577,2909,2879],{}," / ",[1577,2912,2913],{},"receiveShadow",[1866,2915,2916,2919],{},[1577,2917,2918],{},"camera.lookAt()"," 让相机盯住指定点；平面默认竖立，要转 90° 才能当地面。",[1534,2921],{},[1525,2923,2925],{"id":2924},"知识问答","❓ 知识问答",[1530,2927,2928],{},[1622,2929,2930],{},"Q1：灯光越多画面越亮吗？",[1530,2932,2933],{},"总体趋势是变亮，但过亮会一片惨白。亮度主要靠一主一辅两盏灯控制，不够再微调强度，不建议堆数量。",[1530,2935,2936],{},[1622,2937,2938],{},"Q2：为什么我的阴影边缘粗糙、有锯齿？",[1530,2940,2941,2942,2945,2946,2949],{},"阴影贴图默认分辨率较低。可以提高灯光的 ",[1577,2943,2944],{},"shadow.mapSize","，比如 ",[1577,2947,2948],{},"light.shadow.mapSize.set(1024, 1024)","，代价是多一点显存开销。",[1530,2951,2952],{},[1622,2953,2954],{},"Q3：Basic 材质会受到灯光影响吗？",[1530,2956,2957,2958,2961,2962,1629],{},"不会。",[1577,2959,2960],{},"MeshBasicMaterial"," 天生不响应灯光，加再多灯颜色也不变。想要明暗效果请用 ",[1577,2963,2454],{},[1530,2965,2966],{},[1622,2967,2968],{},"Q4：环境光会产生阴影吗？",[1530,2970,2971],{},"不会。环境光没有方向，到处都一样亮，无从产生影子。能产生阴影的是平行光、点光源这类有方向的光。",[1534,2973],{},[1525,2975,2977],{"id":2976},"小练习","🧪 小练习",[1530,2979,2980],{},"搭一个“黄昏小场景”：",[2982,2983,2984,2987,2994],"ol",{},[1866,2985,2986],{},"创建一个球体放在地面上，球体和地面都用 Standard 材质。",[1866,2988,2989,2990,2993],{},"添加低强度环境光，再加一盏暖色调（如 ",[1577,2991,2992],{},"0xffaa55","）的平行光。",[1866,2995,2996],{},"开启阴影，让球体的影子投在地面上。",[1631,2998,3003],{"className":2999,"code":3000,"filename":3001,"language":3002,"meta":1636,"style":1636},"language-vue shiki shiki-themes material-theme-lighter material-theme material-theme-palenight","\u003Ctemplate>\n    \u003Cdiv ref=\"containerRef\" class=\"container\">\u003C/div>\n\u003C/template>\n\n\u003Cscript setup>\nimport { onMounted, ref } from 'vue';\nimport * as THREE from 'three';\n\nconst containerRef = ref(null);\n\nonMounted(() => {\n    // 请在这里编写代码\n});\n\u003C/script>\n\n\u003Cstyle scoped>\n.container {\n    width: 320px;\n    height: 240px;\n}\n\u003C/style>\n","views/DuskScene.vue","vue",[1577,3004,3005,3016,3056,3065,3069,3081,3112,3137,3141,3161,3165,3180,3185,3194,3202,3206,3218,3227,3240,3252,3257],{"__ignoreMap":1636},[1640,3006,3007,3010,3013],{"class":1642,"line":1643},[1640,3008,3009],{"class":1654},"\u003C",[1640,3011,3012],{"class":2462},"template",[1640,3014,3015],{"class":1654},">\n",[1640,3017,3018,3021,3024,3027,3029,3032,3035,3037,3040,3042,3044,3047,3049,3052,3054],{"class":1642,"line":1693},[1640,3019,3020],{"class":1654},"    \u003C",[1640,3022,3023],{"class":2462},"div",[1640,3025,3026],{"class":1646}," ref",[1640,3028,1655],{"class":1654},[1640,3030,3031],{"class":1654},"\"",[1640,3033,2803],{"class":3034},"sIEYB",[1640,3036,3031],{"class":1654},[1640,3038,3039],{"class":1646}," class",[1640,3041,1655],{"class":1654},[1640,3043,3031],{"class":1654},[1640,3045,3046],{"class":3034},"container",[1640,3048,3031],{"class":1654},[1640,3050,3051],{"class":1654},">\u003C/",[1640,3053,3023],{"class":2462},[1640,3055,3015],{"class":1654},[1640,3057,3058,3061,3063],{"class":1642,"line":1727},[1640,3059,3060],{"class":1654},"\u003C/",[1640,3062,3012],{"class":2462},[1640,3064,3015],{"class":1654},[1640,3066,3067],{"class":1642,"line":1930},[1640,3068,1927],{"emptyLinePlaceholder":1926},[1640,3070,3071,3073,3076,3079],{"class":1642,"line":1936},[1640,3072,3009],{"class":1654},[1640,3074,3075],{"class":2462},"script",[1640,3077,3078],{"class":1646}," setup",[1640,3080,3015],{"class":1654},[1640,3082,3083,3087,3090,3093,3095,3097,3099,3102,3105,3107,3110],{"class":1642,"line":1965},[1640,3084,3086],{"class":3085},"s8pZq","import",[1640,3088,3089],{"class":1654}," {",[1640,3091,3092],{"class":1650}," onMounted",[1640,3094,1677],{"class":1654},[1640,3096,3026],{"class":1650},[1640,3098,2472],{"class":1654},[1640,3100,3101],{"class":3085}," from",[1640,3103,3104],{"class":1654}," '",[1640,3106,3002],{"class":3034},[1640,3108,3109],{"class":1654},"'",[1640,3111,1921],{"class":1654},[1640,3113,3114,3116,3119,3122,3125,3128,3130,3133,3135],{"class":1642,"line":1994},[1640,3115,3086],{"class":3085},[1640,3117,3118],{"class":1654}," *",[1640,3120,3121],{"class":3085}," as",[1640,3123,3124],{"class":1650}," THREE ",[1640,3126,3127],{"class":3085},"from",[1640,3129,3104],{"class":1654},[1640,3131,3132],{"class":3034},"three",[1640,3134,3109],{"class":1654},[1640,3136,1921],{"class":1654},[1640,3138,3139],{"class":1642,"line":2089},[1640,3140,1927],{"emptyLinePlaceholder":1926},[1640,3142,3143,3145,3148,3150,3152,3154,3157,3159],{"class":1642,"line":2108},[1640,3144,1647],{"class":1646},[1640,3146,3147],{"class":1650}," containerRef ",[1640,3149,1655],{"class":1654},[1640,3151,3026],{"class":1667},[1640,3153,1670],{"class":1650},[1640,3155,3156],{"class":1654},"null",[1640,3158,1683],{"class":1650},[1640,3160,1921],{"class":1654},[1640,3162,3163],{"class":1642,"line":2367},[1640,3164,1927],{"emptyLinePlaceholder":1926},[1640,3166,3167,3170,3172,3174,3177],{"class":1642,"line":2380},[1640,3168,3169],{"class":1667},"onMounted",[1640,3171,1670],{"class":1650},[1640,3173,2154],{"class":1654},[1640,3175,3176],{"class":1646}," =>",[1640,3178,3179],{"class":1654}," {\n",[1640,3181,3182],{"class":1642,"line":2385},[1640,3183,3184],{"class":1689},"    // 请在这里编写代码\n",[1640,3186,3187,3190,3192],{"class":1642,"line":2391},[1640,3188,3189],{"class":1654},"}",[1640,3191,1683],{"class":1650},[1640,3193,1921],{"class":1654},[1640,3195,3196,3198,3200],{"class":1642,"line":2413},[1640,3197,3060],{"class":1654},[1640,3199,3075],{"class":2462},[1640,3201,3015],{"class":1654},[1640,3203,3204],{"class":1642,"line":2445},[1640,3205,1927],{"emptyLinePlaceholder":1926},[1640,3207,3208,3210,3213,3216],{"class":1642,"line":2478},[1640,3209,3009],{"class":1654},[1640,3211,3212],{"class":2462},"style",[1640,3214,3215],{"class":1646}," scoped",[1640,3217,3015],{"class":1654},[1640,3219,3220,3222,3225],{"class":1642,"line":2485},[1640,3221,1664],{"class":1654},[1640,3223,3046],{"class":3224},"sYGMc",[1640,3226,3179],{"class":1654},[1640,3228,3229,3233,3235,3238],{"class":1642,"line":2506},[1640,3230,3232],{"class":3231},"sug0G","    width",[1640,3234,2466],{"class":1654},[1640,3236,3237],{"class":1673}," 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