Difference between revisions of "LlVecMag"
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m (Added how the calculation works.) |
Lady Sumoku (talk | contribs) m (Replaced old <LSL> block with <source lang="lsl2">) |
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|p1_type=vector|p1_name=vec|p1_desc | |p1_type=vector|p1_name=vec|p1_desc | ||
|return_type=float | |return_type=float | ||
|return_text=that is the magnitude of the vector (the undirected | |return_text=that is the magnitude of the vector (the undirected non-negative distance from {{LSLP|vec}} to {{LSL VR|0.0|0.0|0.0}}). | ||
|spec | |spec | ||
|caveats | |caveats | ||
|examples=< | |examples= | ||
<source lang="lsl2"> | |||
default { | default { | ||
state_entry() | state_entry() | ||
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} | } | ||
} | } | ||
</ | </source> | ||
|helpers | |helpers | ||
|also_functions= | |also_functions= | ||
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|also_tests | |also_tests | ||
|also_articles | |also_articles | ||
|notes | |notes= | ||
* Mathematically the formula for vector magnitude is | |||
** <code>[[llSqrt]](vec.x * vec.x + vec.y * vec.y + vec.z * vec.z)</code> | |||
* Knowing this, there are ways to circumvent llVecMag for more efficient code. | |||
** vec*vec < 16.0 is over twice as fast as llVecMag(vec) < 4.0. | |||
** vec*vec < (dist*dist) is about twice as fast as llVecMag(vec) < dist. | |||
** This can work in many other ways, too, with other comparisons. | |||
|permission | |permission | ||
|negative_index | |negative_index | ||
Latest revision as of 11:00, 22 January 2015
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Summary
Function: float llVecMag( vector vec );| 0.0 | Forced Delay |
| 10.0 | Energy |
Returns a float that is the magnitude of the vector (the undirected non-negative distance from vec to <0.0, 0.0, 0.0>).
| • vector | vec |
Examples
default {
state_entry()
{
vector input = <1.0,2.0,3.0>;
llSay(0,"The magnitude of "+(string)input+" is "+(string)llVecMag(input) + ".");
}
}
Notes
- Mathematically the formula for vector magnitude is
llSqrt(vec.x * vec.x + vec.y * vec.y + vec.z * vec.z)
- Knowing this, there are ways to circumvent llVecMag for more efficient code.
- vec*vec < 16.0 is over twice as fast as llVecMag(vec) < 4.0.
- vec*vec < (dist*dist) is about twice as fast as llVecMag(vec) < dist.
- This can work in many other ways, too, with other comparisons.
Deep Notes
Signature |
|---|
function float llVecMag( vector vec ); |