Emitters radiate from a point or circle

[Flexman]

I added some dusty rotor downwash from a helicopter but I'm not getting the effect I want and wondered if anyone has any ideas on how to do this.

 

I want the particles to emanate around a circumference (mid rotor length), or a single point (under the rotor shaft) and move away in a circle. Leadwerks particles, as far as I can see support a rectangular area and a linear acceleration (one direction only from a 'wind' direction). But since they wind is blowing 360', the rotor downwash, it doesn't quite give the desired results.

 

Any help or suggestions?

 

[Paul Thomas]

I haven't messed with LE particles in a while so I can't exactly give any help, but I just wanted to say how fantastic that looks. Instantly gives me the vision that the helicopter is about to take off, or landing.

[macklebee]

eh... needs fine tuning, but this might work for your purpose...

 

require("scripts/class")
local class=CreateClass(...)

function class:CreateObject(model)
local object=self.super:CreateObject(model)
SetWorld(fw.transparency.world)
object.circlevalue = 0
object.emitter=CreateEmitter(5000,10000,Vec3(math.cos(object.circlevalue),0,math.sin(object.circlevalue)))
object.emitter:SetParent(object.model)
object.emitter:Paint(LoadMaterial("abstract::smoke.mat"))
object.emitter:SetColor(Vec4(1,0,0,1))
object.emitter:SetRadius( .3, .01 )
object.emitter:SetRotationSpeed( .5 )
object.emitter:SetWaver( .5 )
object.emitter:SetPosition(object.model.position,1)
SetWorld(fw.main.world)		


function object:Update()
	object.emitter:SetVelocity(Vec3(math.cos(object.circlevalue),0,math.sin(object.circlevalue)) )
	object.circlevalue = object.circlevalue +.5
end

function object:Free()
	object.emitter:Free()
	self.super:Free()
end

end

 

EDIT-- parented the emitter to model to remove the need for the UpdateMatrix function

[macklebee]

or just rotate the emitter around a point/object...

require("scripts/class")
local class=CreateClass(...)

function class:CreateObject(model)
local object=self.super:CreateObject(model)
SetWorld(fw.transparency.world)
object.emitter=CreateEmitter(500,5000,Vec3(1,0,1))
object.emitter:SetParent(object.model)
object.emitter:Paint(LoadMaterial("abstract::smoke.mat"))
object.emitter:SetColor(Vec4(1,0,0,1))
       object.emitter:SetRadius( .3, .01 )
object.emitter:SetPosition(Vec3(model.position.x+2,model.position.y,model.position.z),1)
SetWorld(fw.main.world)		

function object:Update()
	TurnEntity(object.model,Vec3(0,-10,0))
end

function object:Free()
	object.emitter:Free()
	self.super:Free()
end
end

 

EDIT--- added radius setting to allow you to see the emitter

[Flexman]

Brilliant, I added the emmiter.Turn(...) to the Update() method and it seems to have the desired effect. I'll play around with the parameters while I write this reply...at some frame rates you can see a 'spiral' pattern emerge. In the cockpit it looks pretty convincing.

 

*more edits*

 

After some more parameter experimentation I get a really nice 'shockwave' effect in the dust.

 

...CreateEmitter(300, 1200, Vec3(0, 1, 0), 0) ;

...SetVelocity(Vec3(8, 0.01, 0))

...Turn(Vec3(0, -33, 0))

...AlignToTerrain(TTerrain(game.scene.terrain)) ;

 

I set the Area and Radius according to the helicopters altitude from the ground and rotor RPM (which is a percentage). Above 60 feet it's "hidden". Maybe I should pause it? Not clear what's more efficient.

 

Thanks for those suggestions. Got a good result /thumbup

[Pixel Perfect]

Nice solution Mack.