;notes on the naming/numbering of files to give consistent structure
; all pieces are for wide track unless there is a v in the name, in 
; which case they are for very wide track [ this only applies to corners ]

track piece	cutting	d.hill	vd.hill mount	dist.mount	notes
straight	01	01	01	01	01		normal [also x,y,z - modified versions]
		01l	01l	01l	01l	01l		left hand side going from ground up to full
		01r	01r	01r	01r	01r		right hand side going from ground up to full
				01a				moving out 5000 to cope with track changes
				01b				moving in 5000 to cope with track changes
corner20 in	02	02		02	02		also cut02r
corner20 out	03	03		03	03		also cut03l,x,y and dhill03x,y
corner40 out	04	04		04	04		also cut04x,y,l - variants and ground up
corner40 in	05	05		05			also cut05l - ground up
corner45 out	06	06
corner45 in	07	
corner10 in				08
corner10 out				09

other size corners currently do not have hills, and are unlikely to need them, except for corner10.

need distant hills : 20i,20o,40i
need v.d. hills    : 
need mountains for : 40i,40o,10i,10o[extra wide?]
need d.mountains   : 

radii of corner sizes :
10 : 200000
20 : 100000
40 : 50000
45 : 20000
90 : 15000

track widths :
narrow : 10000
medium : 15000
wide   : 20000
extra  : 30000


also require curved tunnel sections to fit corner40
and curved bridge sections to fit corner20,corner40,corner90 !

size changes :
cutxx[l,r] are from ground up
dhillxx[l,r] are from cutxx distance moving out to dhill distance
vhillxx[l,r] likewise but from dhill
mtxx[l,r] are from cutxx height up to mt height
dmtxx[l,r] are the mtxx[l,r] but at dmt distance (10000 more)

extras : 
dhill01j,k are ground-up versions starting at a distance


reduced detail versions are suffixed with m for medium distance and f for far distance
