material-maker/addons/material_maker/nodes/scratches.mmg

{
	"name": "scratches",
	"node_position": {
		"x": 0,
		"y": 0
	},
	"parameters": {
		"Randomness": 0.5,
		"angle": -1,
		"layers": 5,
		"length": 0.25,
		"randomness": 0.44,
		"waviness": 0.51,
		"width": 0.4
	},
	"shader_model": {
		"code": "",
		"global": "float scratch(vec2 uv, vec2 size, float waviness, float angle, float randomness, vec2 seed) {\n\tfloat subdivide = floor(1.0/size.x);\n\tfloat cut = size.x*subdivide;\n\tuv *= subdivide;\n\tvec2 r1 = rand2(floor(uv)+seed);\n\tvec2 r2 = rand2(r1);\n\tuv = fract(uv);\n\tuv = 2.0*uv-vec2(1.0);\n\tfloat a = 6.28*(angle+(r1.x-0.5)*randomness);\n\tfloat c = cos(a);\n\tfloat s = sin(a);\n\tuv = vec2(c*uv.x+s*uv.y, s*uv.x-c*uv.y);\n\tuv.y += 2.0*r1.y-1.0;\n\tuv.y += 0.5*waviness*cos(2.0*uv.x+6.28*r2.y);\n\tuv.x /= cut;\n\tuv.y /= subdivide*size.y;\n\treturn (1.0-uv.x*uv.x)*max(0.0, 1.0-1000.0*uv.y*uv.y);\n}\n\nfloat scratches(vec2 uv, int layers, vec2 size, float waviness, float angle, float randomness, vec2 seed) {\n\tfloat v = 0.0;\n\tfor (int i = 0; i < layers; ++i) {\n\t\tv = max(v, scratch(fract(uv+seed), size, waviness, angle/360.0, randomness, seed));\n\t\tseed = rand2(seed);\n\t}\n\treturn v;\n}\n",
		"inputs": [

		],
		"instance": "",
		"name": "Scratches",
		"outputs": [
			{
				"f": "scratches($uv, int($layers), vec2($length, $width), $waviness, $angle, $randomness, vec2($seed, 0.0))",
				"type": "f"
			}
		],
		"parameters": [
			{
				"default": 0.25,
				"label": "Length",
				"max": 1,
				"min": 0.1,
				"name": "length",
				"step": 0.01,
				"type": "float"
			},
			{
				"default": 0.5,
				"label": "Width",
				"max": 1,
				"min": 0.1,
				"name": "width",
				"step": 0.01,
				"type": "float"
			},
			{
				"default": 4,
				"label": "Layers",
				"max": 10,
				"min": 1,
				"name": "layers",
				"step": 1,
				"type": "float"
			},
			{
				"default": 0.5,
				"label": "Waviness",
				"max": 1,
				"min": 0,
				"name": "waviness",
				"step": 0.01,
				"type": "float"
			},
			{
				"default": 0,
				"label": "Angle",
				"max": 180,
				"min": -180,
				"name": "angle",
				"step": 1,
				"type": "float"
			},
			{
				"default": 0.5,
				"label": "Randomness",
				"max": 1,
				"min": 0,
				"name": "randomness",
				"step": 0.01,
				"type": "float"
			}
		]
	},
	"type": "shader"
}