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|p1_hover=must fall in the range {{Interval/Text2|gte=-1.0|center=val|lte=1.0}} | |p1_hover=must fall in the range {{Interval/Text2|gte=-1.0|center=val|lte=1.0}} | ||
|return_text=that is the arccosine in radians of {{LSLP|val}} | |return_text=that is the arccosine in radians of {{LSLP|val}} | ||
|func_footnote=The returned value is in the range {{Interval|gte=0.0|center=return|lte=[[PI]]|lteh=PI}}{{Interval/Footnote}} | |func_footnote=The returned value is in the range {{Interval|gte=0.0|center=return|lte=[[PI]]|lteh=PI}}{{Interval/Footnote}}, or {{abbr|NaN|not a number}} signifying a complex result when the parameter is out of range. | ||
|spec | |spec | ||
|caveats | |caveats=*Triggers a {{LSLGC|Error/Math|Math Error}} for complex results if not compiled in Mono. | ||
|examples= | |examples= | ||
< | <syntaxhighlight lang="lsl2"> | ||
// This example exercises the full valid range of argument from -1.0 to +1.0 | // This example exercises the full valid range of argument from -1.0 to +1.0 | ||
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} | } | ||
} | } | ||
</ | </syntaxhighlight> | ||
<syntaxhighlight lang="lsl2"> | |||
// An example for the Law of Cosines to calculate any angle of a triangle from 3 known side lengths. | |||
default | default | ||
{ | { | ||
touch_start(integer num_detected) | touch_start(integer num_detected) | ||
{ | { | ||
vector t=< llFrand(9.0)+1.0 , llFrand(9.0)+1.0 , llFrand(9.0)+1.0 >; // | 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 | 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); | 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); | ||
} | } | ||
} | } | ||
</ | </syntaxhighlight> | ||
|helpers|related | |helpers|related | ||
|also_functions= | |also_functions= | ||
Latest revision as of 15:11, 15 July 2026
| LSL Portal | Functions | Events | Types | Operators | Constants | Flow Control | Script Library | Categorized Library | Tutorials |
Summary
Function: float llAcos( float val );| 0.0 | Forced Delay |
| 10.0 | Energy |
Returns a float that is the arccosine in radians of val
| • float | val | – | must fall in the range [-1.0, 1.0] |
The returned value is in the range [0.0, PI][1], or NaN signifying a complex result when the parameter is out of range.
Caveats
- Triggers a Math Error for complex results if not compiled in Mono.
Examples
// 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));
}
}
// 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
Deep Notes
Footnotes
- ^ The ranges in this article are written in Interval Notation.
Signature |
|---|
function float llAcos( float val ); |