vcmi/config/terrainViewPatterns.json

// Defines terrain view patterns.

// The following properties are mandatory:
// data:		the 3x3 pattern
// mapping:		maps the pattern to a range of terrain view images/frames of the .DEF, e.g. 10-15
//				for patterns which represent two transitions a comma can be used to distinct between dirt and sand
//				e.g. 10-15, 25-35 whereas the first value is always dirt and the second sand

// The following properties are optional:
// flipMode:	should the same be flipped or different images be used(see rock) or is flip not supported at all; allowed values: sameImage | diffImages; default is: sameImage
// id:			the identifier for the pattern if it's referenced by other patterns
// minPoints:	the minimum points to reach to validate the pattern successfully

// The following table shows the rules for the 3x3 pattern of all terrain types: 
// I) normal(e.g. grass, lava, ...):
// N:		Native type
// D:		Dirt border
// S:		Sand border
// T:		Sand OR dirt border(all Ts in the pattern are replaced by dirt OR sand)
// ?:		T or N
// II) dirt:
// N:		Native type
// D:		Dirt border
// S:		Sand border
// ?:		Any border
// III) sand:
// N:		Native type
// S:		Sand border
// IV) water:
// N:		Native type
// S:		Sand border
// ?:		Any border
// V) rock:
// N:		Native type
// S:		Sand border
// ?:		Any border

// Some additional info:
// Rules can be combined with comma. e.g. T, N which would be the same meaning of ?. It's most useful in combination with pattern chaining.
// Chaining of patterns is supported. To reference a another pattern you simply add the <Ref Id> to the relevant field of the pattern.
// Rules can be given points: <[Rule OR Ref Id]-Points> With the property minPoints simple conditions can be built.

{
	"normal" :
	[
		// Standard transitions
		{
			"data" :
			[
				"?", "?", "T",
				"?", "N", "N",
				"T", "N", "N"
			],
			"mapping" : "0-3, 20-23"
		},
		{
			"data" :
			[
				"?", "N", "N",
				"T", "N", "N",
				"?", "N", "N"
			],
			"mapping" : "4-7, 24-27"
		},
		{
			"data" :
			[
				"?", "T", "?",
				"N", "N", "N",
				"N", "N", "N"
			],
			"mapping" : "8-11, 28-31"
		},
		{
			"data" :
			[
				"N", "N", "N",
				"N", "N", "N",
				"N", "N", "T"
			],
			"mapping" : "12-15, 32-35"
		},
		{
			"data" :
			[
				"T", "T", "a-1,?",
				"T", "N", "N",
				"a-1,?", "N", "N"
			],
			"mapping" : "16-17, 36-37",
			"id" : "a",
			"minPoints" : 1
		},
		{
			"data" :
			[
				"N", "N", "N",
				"N", "N", "a-1,N",
				"N", "a-1,N", "T"
			],
			"mapping" : "18-19, 38-39",
			"minPoints" : 1
		},
		// Mixed transitions
		{
			"data" :
			[
				"T", "N", "N",
				"N", "N", "N",
				"N", "N", "T"
			],
			"mapping" : "40, 42"
		},
		{
			"data" :
			[
				"D", "N", "N",
				"N", "N", "N",
				"N", "N", "S"
			],
			"mapping" : "41"
		},
		{
			"data" :
			[
				"N", "N", "D,N",
				"N", "N", "D",
				"S", "D", "D,N"
			],
			"mapping" : "43"
		},
		{
			"data" :
			[
				"N", "N", "S",
				"N", "N", "D",
				"D,N", "D", "D,N"
			],
			"mapping" : "44"
		},
		{
			"data" :
			[
				"N", "N", "D,N",
				"N", "N", "D",
				"N", "N", "S"
			],
			"mapping" : "45"
		},
		{
			"data" :
			[
				"N", "N", "N",
				"N", "N", "N",
				"D,N", "D", "S"
			],
			"mapping" : "46"
		},
		{
			"data" :
			[
				"N", "N", "D,S,N",
				"N", "N", "S",
				"D", "D", "D,S,N"
			],
			"mapping" : "47"
		},
		{
			"data" :
			[
				"N", "N", "D",
				"N", "N", "D",
				"D,S,N", "S", "D,S,N"
			],
			"mapping" : "48"
		},
		// No transition
		{
			"data" :
			[
				"N", "N", "N",
				"N", "N", "N",
				"N", "N", "N"
			],
			"mapping" : "49-72"
		}
	],
	"dirt" :
	[
		// Standard transitions
		{
			"data" :
			[
				"?", "S", "S",
				"S", "N", "N",
				"S", "N", "N"
			],
			"mapping" : "0-3"
		},
		{
			"data" :
			[
				"?", "D", "D",
				"S", "N", "N",
				"?", "D", "D"
			],
			"mapping" : "4-7"
		},
		{
			"data" :
			[
				"?", "S", "?",
				"D", "N", "D",
				"D", "N", "D"
			],
			"mapping" : "8-11"
		},
		{
			"data" :
			[
				"D", "D", "D",
				"D", "N", "N",
				"D", "N", "S"
			],
			"mapping" : "12-15"
		},
		{
			"data" :
			[
				"S", "S", "D",
				"S", "N", "b-1,D",
				"D", "b-1,D", "D"
			],
			"mapping" : "16-17",
			"id" : "a",
			"minPoints" : 1
		},
		{
			"data" :
			[
				"D", "D", "D",
				"D", "N", "a-1,D",
				"D", "a-1,D", "S"
			],
			"mapping" : "18-19",
			"id" : "b",
			"minPoints" : 1
		},
		// Mixed transition
		{
			"data" :
			[
				"S", "D", "D",
				"D", "N", "D",
				"D", "D", "S"
			],
			"mapping" : "20"
		},
		// No transition
		{
			"data" :
			[
				"D", "D", "D",
				"D", "N", "D",
				"D", "D", "D"
			],
			"mapping" : "21-44"
		}
	],
	"sand" :
	[
		{
			"data" :
			[
				"S", "S", "S",
				"S", "N", "S",
				"S", "S", "S"
			],
			"mapping" : "0-23"
		}
	],
	"water" :
	[
		// Standard transitions
		{
			"data" :
			[
				"S", "S", "S",
				"S", "N", "N",
				"S", "N", "N"
			],
			"mapping" : "0-3"
		},
		{
			"data" :
			[
				"?", "N", "N",
				"S", "N", "N",
				"?", "N", "N"
			],
			"mapping" : "4-7"
		},
		{
			"data" :
			[
				"?", "S", "?",
				"N", "N", "N",
				"N", "N", "N"
			],
			"mapping" : "8-11"
		},
		{
			"data" :
			[
				"N", "N", "N",
				"N", "N", "N",
				"N", "N", "S"
			],
			"mapping" : "12-15"
		},
		{
			"data" :
			[
				"S", "S", "N",
				"S", "N", "N",
				"N", "N", "N"
			],
			"mapping" : "16-17",
			"id" : "a"
		},
		{
			"data" :
			[
				"N", "N", "N",
				"N", "N", "a-1,N",
				"N", "a-1,N", "S"
			],
			"mapping" : "18-19",
			"minPoints" : 1
		},
		// No transition
		{
			"data" :
			[
				"N", "N", "N",
				"N", "N", "N",
				"N", "N", "N"
			],
			"mapping" : "20-32"
		}
	],
	"rock" :
	[
		// No transition
		{
			"data" :
			[
				"N", "N", "N",
				"N", "N", "N",
				"N", "N", "N"
			],
			"mapping" : "0-7"
		},
		// Standard transitions
		{
			"data" :
			[
				"?", "S", "?",
				"S", "N", "N",
				"?", "N", "N"
			],
			"mapping" : "8-15",
			"flipMode" : "diffImages"
		},
		{
			"data" :
			[
				"?", "N", "N",
				"S", "N", "N",
				"?", "N", "N"
			],
			"mapping" : "16-19",
			"flipMode" : "diffImages"
		},
		{
			"data" :
			[
				"?", "S", "?",
				"N", "N", "N",
				"N", "N", "N"
			],
			"mapping" : "20-23",
			"flipMode" : "diffImages"
		},
		{
			"data" :
			[
				"N", "N", "N",
				"N", "N", "N",
				"N", "N", "S"
			],
			"mapping" : "24-31",
			"flipMode" : "diffImages"
		},
		{
			"data" :
			[
				"S", "S", "N",
				"S", "N", "N",
				"N", "N", "N"
			],
			"mapping" : "32-39",
			"flipMode" : "diffImages",
			"id" : "a"
		},
		{
			"data" :
			[
				"N", "N", "N",
				"N", "N", "a-1,N",
				"N", "a-1,N", "S"
			],
			"mapping" : "40-47",
			"flipMode" : "diffImages",
			"minPoints" : 1
		}
	]
}