CBEffects : Rotate vent to match object rotation

Gymbyl Coding
#1

Hi, I’m just getting started with CBE and I’m liking it so far.  In my current project I have a player ship that can be rotated through 360 degrees, and I’d like an emitter a vent to rotate with it for an exhaust effect.

Looking through the docs I can’t see anything obvious that would enable me to do this.  Is it possible, and if so how?

Many thanks.

#2

An emitter object has the “angle” property, as stated in the docs.

https://docs.coronalabs.com/api/type/EmitterObject/index.html

Mabye you could ajust it to your needs?

#3

Cheers for that Torben, but I’m wanting to use CBEffects rather than Corona’s particle system.

Anyone else have an idea?

#4

Below is some sample code that uses a timer to change the angle of the laser, both the velocity and the rotation of the individual particles. Hopefully, this points you in the right direction.

local angle = 0 timer.performWithDelay(100, function() angle = angle - 5 end, -1) local angles = CBE.newVent({ title = "angles", preset = "lasergun", onCreation = function(particle, vent) particle:setVelocity(10 \* math.cos(angle\*(math.pi/180)), 10 \* math.sin(angle\*(math.pi/180))) particle.rotation = angle end, }) angles:start()
#5

Hi and sorry for not seeing this sooner.

This is built into CBE:

vent.angles = {10, 15, 20} vent:resetAngles() -- Use this to make the vent recalculate particle trajectories
  • Caleb
#6

An emitter object has the “angle” property, as stated in the docs.

https://docs.coronalabs.com/api/type/EmitterObject/index.html

Mabye you could ajust it to your needs?

#7

Cheers for that Torben, but I’m wanting to use CBEffects rather than Corona’s particle system.

Anyone else have an idea?

#8

Below is some sample code that uses a timer to change the angle of the laser, both the velocity and the rotation of the individual particles. Hopefully, this points you in the right direction.

local angle = 0 timer.performWithDelay(100, function() angle = angle - 5 end, -1) local angles = CBE.newVent({ title = "angles", preset = "lasergun", onCreation = function(particle, vent) particle:setVelocity(10 \* math.cos(angle\*(math.pi/180)), 10 \* math.sin(angle\*(math.pi/180))) particle.rotation = angle end, }) angles:start()
#9

Hi and sorry for not seeing this sooner.

This is built into CBE:

vent.angles = {10, 15, 20} vent:resetAngles() -- Use this to make the vent recalculate particle trajectories
  • Caleb