; CollisionEntity Example
; -----------------------

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

; Collision type ids
type_player=1
type_scenery=2

; NOTE: fixed overhead camera - the arrow keys steer the PLAYER, not the camera
camera=CreateCamera()
PositionEntity camera,0,13,-13
RotateEntity camera,45,0,0

light=CreateLight()
RotateEntity light,60,30,0

floor=CreatePlane()
EntityColor floor,70,110,70

; The player ball is the collision SOURCE, so it needs an ellipsoid radius
player=CreateSphere()
EntityColor player,220,60,60
PositionEntity player,0,1,0
EntityRadius player,1
EntityType player,type_player

; Two walls meeting in a corner, plus a crate
wall1=CreateCube()
ScaleEntity wall1,7,1.5,0.5
PositionEntity wall1,0,1.5,7
EntityType wall1,type_scenery

wall2=CreateCube()
ScaleEntity wall2,0.5,1.5,7
PositionEntity wall2,7,1.5,0
EntityType wall2,type_scenery

crate=CreateCube()
ScaleEntity crate,1.2,1.2,1.2
PositionEntity crate,-4,1.2,3
EntityType crate,type_scenery

; Ellipsoid-to-polygon collisions with a sliding response
Collisions type_player,type_scenery,2,2

While Not KeyDown(1)

    ; Repaint the scenery; whatever is being touched is flashed white below
    EntityColor wall1,150,150,160
    EntityColor wall2,150,150,160
    EntityColor crate,200,160,60

    ; Arrow keys steer the player ball
    If KeyDown(200) Then MoveEntity player,0,0,0.1
    If KeyDown(208) Then MoveEntity player,0,0,-0.1
    If KeyDown(203) Then MoveEntity player,-0.1,0,0
    If KeyDown(205) Then MoveEntity player,0.1,0,0

    ; UpdateWorld performs the collision checks and the slide response
    UpdateWorld

    ; Flash every entity the ball is currently touching
    For i=1 To CountCollisions(player)
        hit=CollisionEntity(player,i)
        EntityColor hit,255,255,255
    Next

    RenderWorld

    Text 0,0,"Arrow keys: drive the ball into the walls and crate   Esc: exit"
    ; CollisionEntity returns the other entity involved in each collision
    n=CountCollisions(player)
    If n=0 Then Text 0,20,"CollisionEntity: no collisions this frame - push against something"
    For i=1 To n
        hit=CollisionEntity(player,i)
        name$="?"
        If hit=wall1 Then name$="back wall"
        If hit=wall2 Then name$="side wall"
        If hit=crate Then name$="crate"
        Text 0,20*i,"CollisionEntity(player,"+i+") = "+hit+" ("+name$+")"
    Next

    Flip

Wend

End