Linear sound and velocity issue

colander

I need some help with sound and motion. I am using the Windows version and i have created a rule to play a sound if self.motion.linearVelocity.x is > 1. This is fine while the actor moves from left to right however when it moves the other way the sound won't play.

I have searched the forum and from what I can see this is correct.

gyroscope

Hi @colander

For the actor moving right to left, use When self.motion.linearVelocity.x is < 0 (or -1).

colander

Thanks gyroscope I had tried that with two attributes in my rule one > 1 and the other < -1 and it didn't work. But your answer let me know I was on the right track so I went back and looked harder at what I had done. I found I hadn't changed All to Any in my rule, duh rookie mistake.

ericzingeler

Sounds like you want to use speed and not velocity. Like so:

attribute:

speedTrigger = 1

rule type 1 (x plane only):

if speedTrigger < abs(motionLinearVelocity.x)

rule type 2 (x and y plane):

if speedTrigger < magnitude(motionLinearVelocity.x , motionLinearVelocity.y)

Velocity is not speed, but instead a vector quantity. Go here for the difference:

http://www.physicsclassroom.com/class/1dkin/u1l1d.cfm

colander

Thanks Eric that works better. Using velocity I needed two rules because I also have a collision condition. Now I only need one rule to achieve the same thing.

A further question how can I get the sound to change as an object changes speed i.e rolling up and down hills?