Added Cellular 7 & 8 noise in FBM node

Add Cellular 7 & 8 noise (contributed by williamchange)

Author: RodZill4

addons/material_maker/nodes/fbm4.mmg

@@ -392,6 +392,84 @@
 			"\treturn value / normalize_factor;",
 			"}",
 			"",
+			"float cellular7_noise_2d(vec2 coord, vec2 size, float offset, float seed) {",
+			"\tvec2 o = floor(coord)+rand2(vec2(seed, 1.0-seed))+size;",
+			"\tvec2 f = fract(coord);",
+			"\tfloat min_dist = 2.0;",
+			"\tfor(float x = -1.0; x <= 1.0; x++) {",
+			"\t\tfor(float y = -1.0; y <= 1.0; y++) {",
+			"\t\t\tvec2 neighbor = vec2(float(x),float(y));",
+			"\t\t\tvec2 node = rand2(mod(o + vec2(x, y), size)) + vec2(x, y);",
+			"\t\t\tnode = 0.5 + 0.25 * sin(offset * TAU + TAU*node);",
+			"\t\t\tvec2 diff = neighbor + node - f;",
+			"\t\t\tconst float s3 = 0.866025;",
+			"\t\t\tvec3 t = vec3(dot(diff, vec2(0,-1)), dot(diff, vec2(s3, 0.5)), dot(diff, vec2(-s3, 0.5)));",
+			"\t\t\tfloat dist = max(t.x, max(t.y, t.z));",
+			"\t\t\tmin_dist = min(min_dist, dist);",
+			"\t\t}",
+			"\t}",
+			"\treturn min_dist;",
+			"}",
+			"",
+			"float fbm_2d_cellular7(vec2 coord, vec2 size, int folds, int octaves, float persistence, float lacunarity, float offset, float seed) {",
+			"\tfloat normalize_factor = 0.0;",
+			"\tfloat value = 0.0;",
+			"\tfloat scale = 1.0;",
+			"\tfor (int i = 0; i < octaves; i++) {",
+			"\t\tfloat noise = cellular7_noise_2d(coord*size, size, offset, seed+float(i));",
+			"\t\tfor (int f = 0; f < folds; ++f) {",
+			"\t\t\tnoise = abs(2.0*noise-1.0);",
+			"\t\t}",
+			"\t\tvalue += noise * scale;",
+			"\t\tnormalize_factor += scale;",
+			"\t\tsize *= lacunarity;",
+			"\t\tscale *= persistence;",
+			"\t}",
+			"\treturn value / normalize_factor;",
+			"}",
+			"",
+			"float cellular8_noise_2d(vec2 coord, vec2 size, float offset, float seed) {",
+			"\tvec2 o = floor(coord)+rand2(vec2(seed, 1.0-seed))+size;",
+			"\tvec2 f = fract(coord);",
+			"\tfloat min_dist1 = 2.0;",
+			"\tfloat min_dist2 = 2.0;",
+			"\tfor(float x = -1.0; x <= 1.0; x++) {",
+			"\t\tfor(float y = -1.0; y <= 1.0; y++) {",
+			"\t\t\tvec2 neighbor = vec2(float(x),float(y));",
+			"\t\t\tvec2 node = rand2(mod(o + vec2(x, y), size)) + vec2(x, y);",
+			"\t\t\tnode = 0.5 + 0.25 * sin(offset * TAU + TAU*node);",
+			"\t\t\tvec2 diff = neighbor + node - f;",
+			"\t\t\tconst float s3 = 0.866025;",
+			"\t\t\tvec3 t = vec3(dot(diff, vec2(0,-1)), dot(diff, vec2(s3, 0.5)), dot(diff, vec2(-s3, 0.5)));",
+			"\t\t\tfloat dist = max(t.x, max(t.y, t.z));",
+			"\t\t\tif (min_dist1 > dist) {",
+			"\t\t\t\tmin_dist2 = min_dist1;",
+			"\t\t\t\tmin_dist1 = dist;",
+			"\t\t\t} else if (min_dist2 > dist) {",
+			"\t\t\t\tmin_dist2 = dist;",
+			"\t\t\t}",
+			"\t\t}",
+			"\t}",
+			"\treturn min_dist2-min_dist1;",
+			"}",
+			"",
+			"float fbm_2d_cellular8(vec2 coord, vec2 size, int folds, int octaves, float persistence, float lacunarity, float offset, float seed) {",
+			"\tfloat normalize_factor = 0.0;",
+			"\tfloat value = 0.0;",
+			"\tfloat scale = 1.0;",
+			"\tfor (int i = 0; i < octaves; i++) {",
+			"\t\tfloat noise = cellular8_noise_2d(coord*size, size, offset, seed+float(i));",
+			"\t\tfor (int f = 0; f < folds; ++f) {",
+			"\t\t\tnoise = abs(2.0*noise-1.0);",
+			"\t\t}",
+			"\t\tvalue += noise * scale;",
+			"\t\tnormalize_factor += scale;",
+			"\t\tsize *= lacunarity;",
+			"\t\tscale *= persistence;",
+			"\t}",
+			"\treturn value / normalize_factor;",
+			"}",
+			"",
 			"// MIT License Inigo Quilez - https://www.shadertoy.com/view/Xd23Dh",
 			"float voronoise_noise_2d( vec2 coord, vec2 size, float offset, float seed) {",
 			"\tvec2 i = floor(coord) + rand2(vec2(seed, 1.0-seed)) + size;",
@@ -545,6 +623,14 @@
 						"name": "Cellular 6",
 						"value": "cellular6"
 					},
+					{
+						"name": "Cellular 7",
+						"value": "cellular7"
+					},
+					{
+						"name": "Cellular 8",
+						"value": "cellular8"
+					},
 					{
 						"name": "Voronoise",
 						"value": "voronoise"