; SimplifyMesh Example
; --------------------

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

camera=CreateCamera()
PositionEntity camera,0,0,-5

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

; The left ball keeps every triangle
full=CreateSphere(32)
PositionEntity full,-1.3,0,0
EntityColor full,90,160,230

; The right ball is a copy, simplified to keep about half its triangles
keep#=0.5
simple=CopyMesh(full)
SimplifyMesh simple,keep
PositionEntity simple,1.3,0,0
EntityColor simple,230,160,90

wire=True

While Not KeyDown(1)

    ; [ / ] keep fewer or more triangles: simplify a fresh copy each time
    old#=keep
    If KeyHit(26) And keep>0.15 Then keep=keep-0.1
    If KeyHit(27) And keep<0.95 Then keep=keep+0.1
    If keep<>old
        FreeEntity simple
        simple=CopyMesh(full)
        SimplifyMesh simple,keep
        PositionEntity simple,1.3,0,0
        EntityColor simple,230,160,90
    EndIf

    ; Space shows or hides the triangles
    If KeyHit(57) Then wire=Not wire
    WireFrame wire

    TurnEntity full,0,0.5,0
    TurnEntity simple,0,0.5,0

    ; 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   [ / ] : keep   Space: wireframe   Esc: exit"
    Text 0,20,"SimplifyMesh copy,"+keep
    Text 0,40,"Left: "+CountTriangles(GetSurface(full,1))+" triangles   Right: "+CountTriangles(GetSurface(simple,1))

    Flip

Wend

End