Try this example :)
Open in online IDE;Break glass example, by Jeppe Nielsen 2003 Type glass Field e Field s Field w#,h# Field sx#,sy# Field broken End Type Type glasspiece Field p Field pivot[3] Field x#,y#,z# Field vx#,vy#,vz# Field pitch#,yaw#,roll# Field g.glass Field index End Type Const gravity#=0.004 Graphics3D 800,600,16,2 pivot=CreatePivot() camera=CreateCamera(pivot) CameraClsColor camera,255,255,255 MoveEntity camera,0,1,-4 light=CreateLight(1) RotateEntity light,-10,40,0 g.glass=glassnew(2,2,20,20) PositionEntity g\e,0,0,-1 g.glass=glassnew(2,2,20,20) PositionEntity g\e,0,0,1 g.glass=glassnew(2,2,20,20) PositionEntity g\e,0,0,-1 TurnEntity g\e,0,90,0 g.glass=glassnew(2,2,20,20) PositionEntity g\e,2,0,-1 TurnEntity g\e,0,90,0 Color 0,0,0 Repeat TurnEntity pivot,0,1,0 If MouseHit(1)>0 p=CameraPick(camera,MouseX(),MouseY()) g.glass=Last glass While g<>Null If g\e=p glassbreak(g) Exit EndIf g=Before g Wend EndIf glassupdate() RenderWorld() mx=MouseX() my=MouseY() Text 400,20,"SHOOT the glass cube :)",1 Oval mx-30,my-30,60,60,0 Plot mx,my Flip Until KeyDown(1) End Function glassnew.glass(wid#,hei#,secx,secy,parent=0) g.glass=New glass g\w#=wid# g\h#=hei# g\e=CreateMesh(parent) g\s=CreateSurface(g\e) dx#=1/Float(secx) dy#=1/Float(secy) g\sx#=dx# g\sy#=dy# y#=0 For yy=1 To secy x#=0 For xx=1 To secx gp.glasspiece=New glasspiece gp\g=g gp\index=AddVertex(g\s,x#,y#,0,x#,y#,0) AddVertex(g\s,x#+dx#,y#,0,x#+dx#,y#,0) AddVertex(g\s,x#,y#+dy#,0,x#,y#+dy#,0) AddVertex(g\s,x#+dx#,y#+dy#,0,x#+dx#,y#+dy#,0) AddTriangle g\s,gp\index,gp\index+3,gp\index+1 AddTriangle g\s,gp\index,gp\index+3,gp\index+2 x#=x#+dx# Next y#=y#+dy# Next ScaleMesh g\e,wid#,hei#,1 EntityFX g\e,16 EntityPickMode g\e,2 EntityColor g\e,0,0,255 EntityAlpha g\e,0.5 Return g End Function Function glassbreak(g.glass) If g\broken=1 Then Return g\broken=1 For gp.glasspiece=Each glasspiece If gp\g=g gp\p=CreatePivot() gp\x#=(VertexX(g\s,gp\index)+VertexX(g\s,gp\index+3))/2 gp\y#=(VertexY(g\s,gp\index)+VertexY(g\s,gp\index+3))/2 gp\z#=(VertexZ(g\s,gp\index)+VertexZ(g\s,gp\index+3))/2 gp\vx#=Rnd(-.02,.02) gp\vy#=Rnd(-.02,.02) gp\vz#=Rnd(-.02,.02) gp\pitch#=Rnd(-2,2) gp\yaw#=Rnd(-2,2) gp\roll#=Rnd(-2,2) PositionEntity gp\p,gp\x,gp\y,gp\z For n=0 To 3 gp\pivot[n]=CreatePivot(gp\p) PositionEntity gp\pivot[n],VertexX(g\s,gp\index+n),VertexY(g\s,gp\index+n),VertexZ(g\s,gp\index+n),1 Next EndIf Next End Function Function glassupdate() For g.glass=Each glass If g\broken=1 For gp.glasspiece=Each glasspiece If gp\g=g gp\vy=gp\vy-gravity# gp\x=gp\x+gp\vx gp\y=gp\y+gp\vy gp\z=gp\z+gp\vz PositionEntity gp\p,gp\x+gp\g\sx#/2,gp\y+gp\g\sy#/2,gp\z,1 TurnEntity gp\p,gp\pitch,gp\yaw,gp\roll For n=0 To 3 VertexCoords gp\g\s,gp\index+n,EntityX(gp\pivot[n],1),EntityY(gp\pivot[n],1),EntityZ(gp\pivot[n],1) Next If gp\y<-10 Then glassdelete(g) EndIf Next EndIf Next End Function Function glassdelete(g.glass) For gp.glasspiece=Each glasspiece If gp\g=g For n=0 To 3 FreeEntity gp\pivot[n] Next FreeEntity gp\p Delete gp EndIf Next FreeEntity g\e Delete g End Function