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functions:llapplyimpulse [2015-07-10 04:09 SLT] sei more style, still lacking |
functions:llapplyimpulse [2015-09-22 19:54 SLT] (current) sei style |
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| === impulse === | === impulse === | ||
| - | A [[types/vector]] specifying the impulse to apply. Impulse is expressed in units of $lart[lindogram|lindograms]·m/s. For example, in absence of other effects such as gravity or friction, applying an impulse vector of `<1, 0, 0> to an object with a mass of 1.25 $art[lindograms] will add a velocity of 0.8 m/s in the given direction (applied according to the **local** parameter). | + | A $lty[vector] specifying the impulse to apply. Impulse is expressed in units of $lart[lindogram|lindograms]·m/s. For example, in absence of other effects such as gravity or friction, applying an impulse vector of `<1, 0, 0> to an object with a mass of 1.25 $art[lindograms] will add a velocity of 0.8 m/s in the given direction (applied according to the $prm[local] parameter). |
| === local === | === local === | ||
| - | [[types/Boolean]] value indicating whether the **impulse** vector applies its effect in coordinates local to the root prim or avatar (if [[constants/TRUE]]) or in sim coordinates (if [[constants/FALSE]]). | + | $lty[Boolean] value indicating whether the $prm[impulse] vector applies its effect in coordinates local to the root prim or avatar (if $lct[TRUE]) or in sim coordinates (if $lct[FALSE]). |
| - | When **TRUE**, the **impulse** vector specifies coordinates local to the root prim. For example, if **impulse** is `<1, 0, 0> and the X axis of the root prim is looking northwest, then the impulse will be applied in the northwest direction, aligned with the root prim's X axis. If it's an attachment, the vector is relative to the avatar's orientation. | + | When $ct[TRUE], the $prm[impulse] vector specifies coordinates local to the root prim. For example, if $prm[impulse] is `<1, 0, 0> and the X axis of the root prim is looking northwest, then the impulse will be applied in the northwest direction, aligned with the root prim's X axis. If it's an attachment, the vector is relative to the avatar's orientation. |
| - | When **FALSE**, the vector specifies sim coordinates, where positive X is east, positive Y is north, positive Z is up, and vice versa for negative; for example, if **impulse** is `<-1, 0, 0>, the impulse will be applied in the westward direction, no matter how the root prim or the avatar is oriented. | + | When $ct[FALSE], the vector specifies sim coordinates, where positive X is east, positive Y is north, positive Z is up, and vice versa for negative; for example, if $prm[impulse] is `<-1, 0, 0>, the impulse will be applied in the westward direction, no matter how the root prim or the avatar is oriented. |
| ===== Notes ===== | ===== Notes ===== | ||
| - | * To change the velocity of the object by a given amount, multiply the desired velocity difference by its [[llGetMass|mass in Lindograms]] (see example below). | + | * To change the velocity of the object by a given amount, multiply the desired velocity difference by its $lfn[llGetMass|mass in Lindograms] (see example below). |
| - | * The maximum speed (magnitude of the velocity vector) of an object seems to be limited to 202.8125 m/s, although the value measured by [[llGetVel]] can be greater for an instant before it is actually applied. The value returned by **llGetVel** seems to be limited to a magnitude of 250 m/s. | + | * The maximum speed (magnitude of the velocity vector) of an object seems to be limited to 202.8125 m/s, although the value measured by $lfn[llGetVel] can be greater for an instant before it is actually applied. The value returned by $fn[llGetVel] seems to be limited to a magnitude of 250 m/s. |
| * FIXME: official wiki says total momentum has a cap too. Test. | * FIXME: official wiki says total momentum has a cap too. Test. | ||
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| ===== See also ===== | ===== See also ===== | ||
| - | * [[llApplyRotationalImpulse]] is the same but for [[http://en.wikipedia.org/wiki/Angular_momentum|angular momentum]] instead of linear. | + | * $lfn[llApplyRotationalImpulse] is the same but for [[http://en.wikipedia.org/wiki/Angular_momentum|angular momentum]] instead of linear. |
| - | * [[llSetForce]] applies a force to an object continuously. | + | * $lfn[llSetForce] applies a force to an object continuously. |
| - | * [[llSetTorque]] is the angular equivalent to **llSetForce**. | + | * $lfn[llSetTorque] is the angular equivalent to $fn[llSetForce]. |
| - | * [[llSetForceAndTorque]] sets both force and torque at the same time. | + | * $lfn[llSetForceAndTorque] sets both force and torque at the same time. |
| - | * [[llSetVelocity]] applies the necessary impulse to an object for its velocity to match the given value. | + | * $lfn[llSetVelocity] applies the necessary impulse to an object for its velocity to match the given value. |
| - | * [[llGetVel]] returns the current velocity of the object. | + | * $lfn[llGetVel] returns the current velocity of the object. |
| - | * [[llSetAngularVelocity]] and [[llGetOmega]] are the angular equivalents of **llSetVelocity/llGetVel**. | + | * $lfn[llSetAngularVelocity] and $lfn[llGetOmega] are the angular equivalents of $fn[llSetVelocity]/$fn[llGetVel]. |
| - | * [[llGetMass]] returns the mass in $lart[lindogram|Lindograms] of an object. | + | * $lfn[llGetMass] returns the mass in $lart[lindogram|Lindograms] of an object. |
| - | * [[llGetMassMKS]] returns the mass in kilograms of an object. Most LSL functions use $art[Lindograms], so this function is of limited use in physics calculations. | + | * $lfn[llGetMassMKS] returns the mass in kilograms of an object. Most LSL functions use $art[Lindograms], so this function is of limited use in physics calculations. |