; ParticleRenderMode Example
; --------------------------
; Requires Extended mode.

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

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

; Mode 3 renders lit meshes, so give the scene a light
light=CreateLight()
RotateEntity light,45,-30,0

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

; Mode names for the overlay
Dim mode_name$(3)
mode_name$(1)="1 billboard"
mode_name$(2)="2 stretched billboard"
mode_name$(3)="3 mesh"

; A spark fountain to view in each render mode
emitter=CreateParticleEmitter(800)
PositionEntity emitter,0,0.5,0
ParticleEmissionRate emitter,150
ParticleLifetime emitter,1.5,2.5
ParticleVelocity emitter,0,4,0,1,0.5,1
ParticleGravity emitter,0,-5,0
ParticleColor emitter,255,220,120,1,255,80,0,0
ParticleSize emitter,0.1,0.03,0.2

; Mode 3 needs a source mesh to batch
cone=CreateCone(6)
HideEntity cone
ParticleMesh emitter,cone

mode=1
stretch#=0.08
ParticleRenderMode emitter,1,stretch

While Not KeyDown(1)

    ; Keys 1-3 pick the render mode, [ / ] tune the mode-2 stretch factor
    If KeyHit(2) Then mode=1
    If KeyHit(3) Then mode=2
    If KeyHit(4) Then mode=3
    If KeyDown(26) And stretch>0 Then stretch=stretch-0.002
    If KeyDown(27) And stretch<0.3 Then stretch=stretch+0.002

    ; Apply the current mode and stretch
    ParticleRenderMode emitter,mode,stretch

    ; 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   1/2/3: render mode   [ / ] : stretch   Esc: exit"
    Text 0,20,"ParticleRenderMode emitter,"+mode+","+stretch+" ("+mode_name$(mode)+")"

    Flip

Wend

End