天气预报 > 其他 > 椭圆内法线方向怎么求
椭圆内法线方向怎么求
更新时间: 2020-11-01 00:00:00  

求椭圆内法线方向的方法是掌握外法线指向曲面外侧,内法线指向内侧。可以在曲面内侧取一点Q,如果法线方向和向量PQ的夹角大于90°,可以判定其为外法线,反之为内法线。三维平面的法线是垂直于该平面的三维向量。曲面在某点P处的法线为垂直于该点切平面的向量。

关键词: 椭圆 法线 方向 怎么

椭圆内法线方向怎么求相关经验

天气预报

最新推荐

页面:/news/view-1367537/ | 耗时:0.9053 s | 内存:2.11 MB | 查询:4 | 缓存读取:3 写入:0 | 加载文件:25
select * from tbl_Articles WHERE ArticleID=1367537 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1367537 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1367537 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1121102,1063147,1088484,1499493,1049542,1131985,1096603,1045005,1065131,1594630,1106882,1096711,1131625,960752,1047881,1097743,1079219,1121218,1130394,1493313,1131263,1067025,1066160,1122104,1072655,1078358,1068080,1046100,1129287,2223504) ORDER BY field (ArticleID,1121102,1063147,1088484,1499493,1049542,1131985,1096603,1045005,1065131,1594630,1106882,1096711,1131625,960752,1047881,1097743,1079219,1121218,1130394,1493313,1131263,1067025,1066160,1122104,1072655,1078358,1068080,1046100,1129287,2223504)