; AddEntityLOD Example
; --------------------

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

camera=CreateCamera()
PositionEntity camera,0,4,-15
CameraClsColor camera,20,30,50

light=CreateLight()
RotateEntity light,45,45,0

ground=CreatePlane()
EntityColor ground,60,80,55

; Each detail level is painted its own colour so switches are easy to spot
green_brush=CreateBrush(60,200,80)
amber_brush=CreateBrush(230,180,50)
red_brush=CreateBrush(220,70,60)

; Detailed base tree, plus two cruder stand-in meshes
tree=CreateSphere(16)
ScaleMesh tree,1,2,1
PositionMesh tree,0,2,0
PaintMesh tree,green_brush

tree_mid=CreateSphere(6)
ScaleMesh tree_mid,1,2,1
PositionMesh tree_mid,0,2,0
PaintMesh tree_mid,amber_brush

tree_far=CreateCube()
ScaleMesh tree_far,0.9,1.8,0.9
PositionMesh tree_far,0,1.8,0
PaintMesh tree_far,red_brush

; Register the LOD levels: amber takes over at 12 units, red at 24
AddEntityLOD tree,tree_mid,12
AddEntityLOD tree,tree_far,24

; A forest of copies - CopyEntity copies the complete LOD table
For n=0 To 59
    copy=CopyEntity(tree)
    PositionEntity copy,(n Mod 6)*4-10,0,(n/6)*5
Next
HideEntity tree
HideEntity tree_mid
HideEntity tree_far

While Not KeyDown(1)

    ; 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

    RenderWorld

    Text 0,0,"Arrow keys: move camera   Esc: exit"
    Text 0,20,"Green=base mesh   Amber=LOD from 12   Red=LOD from 24"
    Text 0,40,"Trees drawn with a LOD mesh: "+RenderLODSelections()

    Flip

Wend

End