; ParticleSeed Example
; --------------------
; Requires Extended mode.

Graphics3D 640,480,0,2
SetBuffer BackBuffer()

SeedRnd MilliSecs()

camera=CreateCamera()
PositionEntity camera,0,2,-6
CameraClsColor camera,8,12,24

floor=CreatePlane()
EntityColor floor,30,34,44

; A firework emitter - bursts only, so each pattern is easy to compare
emitter=CreateParticleEmitter(1000)
PositionEntity emitter,0,2,0
ParticleEmissionRate emitter,0
ParticleLifetime emitter,2,3
ParticleVelocity emitter,0,0,0,2.5,2.5,2.5
ParticleGravity emitter,0,-1,0
ParticleDrag emitter,1
ParticleColor emitter,150,220,255,1,255,120,220,0
ParticleSize emitter,0.1,0.02,0.3
EntityBlend emitter,3

seed=12345
ParticleSeed emitter,seed
EmitParticles emitter,300

While Not KeyDown(1)

    ; R replays the SAME seed - the burst pattern repeats exactly
    If KeyHit(19)
        ParticleSeed emitter,seed
        ClearParticles emitter
        EmitParticles emitter,300
    EndIf

    ; Space picks a new random seed - a brand new pattern
    If KeyHit(57)
        seed=Rand(1,99999)
        ParticleSeed emitter,seed
        ClearParticles emitter
        EmitParticles emitter,300
    EndIf

    ; Arrow keys move the camera
    If KeyDown(200) Then MoveEntity camera,0,0,0.1
    If KeyDown(208) Then MoveEntity camera,0,0,-0.1
    If KeyDown(203) Then TurnEntity camera,0,1,0
    If KeyDown(205) Then TurnEntity camera,0,-1,0

    ; UpdateWorld also advances the particle simulation
    UpdateWorld
    RenderWorld

    Text 0,0,"Arrow keys: move camera   R: replay same seed   Space: new seed   Esc: exit"
    Text 0,20,"ParticleSeed emitter,"+seed+" (same seed = identical firework)"

    Flip

Wend

End