Walking Jun

//

// File: swarm.lsl

// Date            Author        number of nodes

// 2007/9/24       walkinglint   164

//

// Swarm script

// by Apotheus Silverman

// This script is my implementation of the well-known swarm algorithm

// which can be found in numerous open-source programs.

// Due to the specifics of the SL environment, I have strayed from some

// of the traditional rules slightly. Regardless, the end effect is

// indistiguishable from the original algorithm.

// Configurable parameters

// Determines whether or not to enable STATUS_SANDBOX.

//

integer sandbox = FALSE;

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STATUS_SANDBOX というのは

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If value is TRUE, object can't cross region boundaries or move more than 10m 

from its start location (and loses physical attribute). 

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というものらしい... ふむ～

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// Timer length

float timer_length = 0.5;

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llSensorRepeat の時間間隔のようだ

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// Die after this many seconds

integer kill_time = 300;

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使われてないぞ

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// Enables or disables schooling behavior

integer school = TRUE;

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群れるか群れないかを切り分けているのか

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// Schooling comm channel

integer school_comm_channel = 9284;

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群れのコミュニケーション用のチャネル

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// Schooling behavior update interval (should be a multiple of timer_length)

float school_update_interval = 2.0;

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群れの動きをアップデートする時間間隔?

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// How much force to apply with each impulse

float force_modifier = 0.7;

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llSetForce でかける力の大きさ

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// How much force to apply when repulsed by another like me

float repulse_force_modifier = 0.86;

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llApplyImpulse でかける力の大きさ（衝突時）

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//

// How much friction to use on a scale from 0 to 1.

// Note that friction takes effect each timer cycle, so the lower the timer length, 

// the more the friction you specify here will take effect, thereby increasing actual

// friction applied.

//

float friction = 0.45;

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llApplyImpulse でかける摩擦? の大きさ

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//

// How much to modify the rotation strength. Higher numbers produce greater strength

// Note that if the modifier is too small, the object may not rotate at all.

//

float rotation_strength_modifier = 2.8;

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llLookAt でかける回転力の大きさ

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// How much to modify rotation damping. Higher numbers produce slower rotation.

float rotation_damping_modifier = 5000000.0;

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llLookAt でかけるダンピングの大きさ

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//

// Does this object "swim" in air or water?

// 2 = air

// 1 = water

// 0 = both

//

integer flight_mode = 2;

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領域指定 2 は空を指示

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// Maximum distance from spawn point

float max_distance = 2.5;

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初期位置から離れる事のできる距離の最大値?

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// How far away to scan for others like me

float sensor_distance = 5.0;

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他を探すスキャン距離の最大値

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// *** Don’t change anything below unless you *really* know what you’re doing ***

float mass;

vector spawn_location;

float school_timer = 0.0;

vector school_modifier = <0, 0, 0>;

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後で用いられる変数

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// Update rotation function

do_rotation(vector mypos, vector myvel) {

    llLookAt(mypos + myvel, mass * rotation_strength_modifier, mass * rotation_damping_modifier);

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今の位置から進行（速度）方向を向く

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}

// Collision function

collide(vector loc) {

    vector mypos = llGetPos();

    // Apply repulse force

    vector impulse = llVecNorm(mypos - loc);

    llApplyImpulse(impulse * repulse_force_modifier * mass, FALSE);

    // llSay(0, "collide() - impulse " + (string)impulse + " applied.");

    // Update rotation

    do_rotation(mypos, llGetVel());

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与えられた位置から今の位置への差分を impulse とし その方向に力を加え その方向を向く

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位置を与えることで反発する動きを作っている

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}