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| 函数名
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| Function:list llCastRay(vector start,vector end,list options );
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参数：vector start -starting location
vector end -ending location
list options -can consists of any number of option flags and their parameters.
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| 返回值：Returns a list of strided values with an additional integer status code on the end.Each stride consists of two mandatory values {key uuid,vector position}and possibly some optional values {integer link_number,vector normal}see RC DATA FLAGS for details.The status_code if it is negative is an error code,otherwise it is the number of hits (and strides)returned.
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