1 /**
2 * Mandelbulber v2, a 3D fractal generator _%}}i*<. ______
3 * Copyright (C) 2020 Mandelbulber Team _>]|=||i=i<, / ____/ __ __
4 * \><||i|=>>%) / / __/ /___/ /_
5 * This file is part of Mandelbulber. )<=i=]=|=i<> / /__ /_ __/_ __/
6 * The project is licensed under GPLv3, -<>>=|><|||` \____/ /_/ /_/
7 * see also COPYING file in this folder. ~+{i%+++
8 *
9 * reference: eiifie paxis2 https://www.shadertoy.com/view/XlSGDc
10 * paxis idea from dila originally at https://www.shadertoy.com/view/Xlj3DK
11 */
12
13 #include "all_fractal_definitions.h"
14
cFractalOctahedron()15 cFractalOctahedron::cFractalOctahedron() : cAbstractFractal()
16 {
17 nameInComboBox = "Octahedron";
18 internalName = "octahedron";
19 internalID = fractal::octahedron;
20 DEType = analyticDEType;
21 DEFunctionType = customDEFunction;
22 cpixelAddition = cpixelDisabledByDefault;
23 defaultBailout = 10.0;
24 DEAnalyticFunction = analyticFunctionCustomDE;
25 coloringFunction = coloringFunctionDefault;
26 }
27
FormulaCode(CVector4 & z,const sFractal * fractal,sExtendedAux & aux)28 void cFractalOctahedron::FormulaCode(CVector4 &z, const sFractal *fractal, sExtendedAux &aux)
29 {
30 if (aux.i >= fractal->transformCommon.startIterationsD
31 && aux.i < fractal->transformCommon.stopIterationsD1)
32 {
33 CVector4 a;
34 double colorAdd = 0.0;
35 double b = 1.0;
36 double d;
37 double limitA = fractal->transformCommon.offset0;
38 double limitB = fractal->transformCommon.offsetA0;
39
40 for (int i = 0; i < fractal->transformCommon.int3X; i++)
41 {
42 double sizer1 = fractal->transformCommon.scale1 * b;
43 a = fabs(z);
44 z.x -= sign(z.x) * max(1.0 * sign(a.x - max(a.y, a.z)), limitA) * sizer1;
45 z.y -= sign(z.y) * max(1.0 * sign(a.y - max(a.z, a.x)), limitA) * sizer1;
46 z.z -= sign(z.z) * max(1.0 * sign(a.z - max(a.x, a.y)), limitA) * sizer1;
47 b *= fractal->transformCommon.scale05;
48 }
49
50 d = z.Length() - fractal->transformCommon.minR2p25;
51 for (int i = 0; i < fractal->transformCommon.int3Y; i++)
52 {
53 double sizer2 = fractal->transformCommon.scaleA1 * b;
54 a = fabs(z);
55 z.x -= sign(z.x) * max(1.0 * sign(a.x - min(a.y, a.z)), limitB) * sizer2;
56 z.y -= sign(z.y) * max(1.0 * sign(a.y - min(a.z, a.x)), limitB) * sizer2;
57 z.z -= sign(z.z) * max(1.0 * sign(a.z - min(a.x, a.y)), limitB) * sizer2;
58 b *= fractal->transformCommon.minR05;
59 colorAdd += z.Dot(z);
60 }
61 z *= fractal->transformCommon.scaleC1;
62 aux.DE *= fractal->transformCommon.scaleC1;
63 a = fabs(z);
64
65 double d2;
66
67 if (!fractal->transformCommon.functionEnabledFalse)
68 d2 = max(a.x, max(a.y, a.z)) - b * fractal->transformCommon.scaleD1;
69 else
70 d2 = a.Length() - b * fractal->transformCommon.scaleD1;
71
72 d2 = max(d2, -d) / fabs(aux.DE);
73
74 if (!fractal->transformCommon.functionEnabledAFalse)
75 aux.dist = d2;
76 else
77 aux.dist = min(aux.dist, d2);
78
79 // aux.color
80 if (fractal->foldColor.auxColorEnabledFalse)
81 {
82 colorAdd = fractal->foldColor.difs0000.x * colorAdd;
83 colorAdd += fractal->foldColor.difs0000.y * max(a.x, max(a.y, a.z));
84 colorAdd += fractal->foldColor.difs0000.z * a.Length();
85 colorAdd += fractal->foldColor.difs0000.w * d;
86 aux.color += colorAdd * 100.0;
87 }
88 }
89 }
90