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| 函数名
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| Function: float llAcos( float val );
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| 参数：float val –must fall in the range [-1.0, 1.0]
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| 返回值：Returns a float that is the arccosine in radians of val.
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| 示例
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示例1
// This example exercises the full valid range of argument from -1.0 to +1.0
default
{
touch_start(integer num_detected)
{
float random = llFrand(2.0) - 1.0;
llOwnerSay("The arccosine of " + (string)random + " is " + (string)llAcos(random));
}
}
示例2
//An example for the Law of Cosines to calculate any angle of a triangle from 3 known side lengths.
default
{
touch_start(integer num_detected)
{
vector t=< llFrand(9.0)+1.0 , llFrand(9.0)+1.0 , llFrand(9.0)+1.0 >; //the 3 values of this vector are used to set the lengths of 3 sides of a triangle.
float anglexy=llAcos( (t.x*t.x+t.y*t.y-(t.z*t.z)) / ( 2*t.x*t.y) ) //Law Of Cosines
llOwnerSay("Using the Law Of Cosines, the angle of a triangle between side a="+(string)t.x+"and side b="+(string)t.y+"is = "+(string)anglexy+" radians="+(string)(anglexy*RAD_TO_DEG)+"° and that angle is not on side c="+(string)t.z);
}
}
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