Difference between revisions of "LlAcos"
Jump to navigation
Jump to search
Search JIRA for related Issues
Omei Qunhua (talk | contribs) (Corrected invalid misleading comment. Tested.) |
(added an example, applying "the law of cosines") |
||
| Line 20: | Line 20: | ||
llOwnerSay("The arccosine of " + (string)random + " is " + (string)llAcos(random)); | llOwnerSay("The arccosine of " + (string)random + " is " + (string)llAcos(random)); | ||
} | |||
} | |||
</lsl> | |||
<lsl> | |||
//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); | |||
} | } | ||
} | } | ||
Revision as of 15:55, 30 August 2014
| LSL Portal | Functions | Events | Types | Operators | Constants | Flow Control | Script Library | Categorized Library | Tutorials |
Summary
Function: float llAcos( float val );| 172 | Function ID |
| 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] |
Caveats
Examples
<lsl> // 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));
}
} </lsl>
<lsl> //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);
}
}
</lsl>See Also
Deep Notes
Footnotes
- ^ The ranges in this article are written in Interval Notation.
Signature |
|---|
function float llAcos( float val ); |