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llAcos

float llAcos(float Value)

Returns the arc-cosine of Value, in radians.

Parameters

Value (float): A floating-point value.

Technical Details

Return Type: float
Energy: 10

Triggers a Math Error for complex results if not compiled in Mono.

Examples

Basic Example - Valid Range

//  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));
    }
}

Law of Cosines - Triangle Angle Calculation

//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);
    }
}

See Also

llSin - sine function
llAsin - inverse sine function
llCos - cosine function
llTan - tangent function
llAtan2 - inverse tangent function