float llCos(float theta)
Returns the
cosine of
theta radians.
Given a point on a circumference, it is the horizontal distance from the center, measured in radians.
____
| \
| B
| /|\
| / | \
| / | \
| / | |
A/____C___|D
not a good circle, but measures the distance
AC where
DB is the number of radians (
usually between 0 and TWO_PI) you must go around the circumference.
| Radians | Angle | Cosine |
| 0 | 0 | 1 |
| 0.392699 | 22.5 | 0.923880 |
| 0.785398 | 45 | 0.707107 |
| 1.178097 | 67.5 | 0.382683 |
| 1.570796 | 90 | 0 |
| 1.963495 | 112.5 | -0.382684 |
| 2.356194 | 135 | -0.707107 |
| 2.748893 | 157.5 | -0.923880 |
| 3.141593 | 180 | -1 |
| 3.534292 | 202.5 | -0.923880 |
| 3.926991 | 225 | -0.707107 |
| 4.319690 | 247.5 | -0.382684 |
| 4.712389 | 270 | 0 |
| 5.105088 | 292.5 | 0.382684 |
| 5.497787 | 315 | 0.707107 |
| 5.890487 | 337.5 | 0.923880 |
The following will rez 16 objects around the object containing the script in a circle. It will use the first object in its inventory as the object to rez.
default
{
state_entry()
{
// name of first object in inventory
string name = llGetInventoryName(INVENTORY_OBJECT, 0);
// number of objects to rez
float count = 16;
// size of circle from center to the edge
float radius = 5.0;
// distance in radians between each object
float step = (1.0 / count) * TWO_PI;
// position on circumference to place object
float radians;
// move along circumference
for(radians = 0.0; radians < TWO_PI; radians += step)
{
// get x/y position of circumference
float x = llCos(radians) * radius;
float y = llSin(radians) * radius;
// translate relative to objects current position
vector pos = llGetPos();
pos.x += x;
pos.y += y;
// rez the object
llRezObject(name, pos, ZERO_VECTOR, ZERO_ROTATION, 0);
}
}
}
Compare with
llAcos.
Functions |
Math