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 * amazing surf from Mandelbulber3D. Formula proposed by Kali, with features added by DarkBeam
10 *
11 * This formula has a c.x c.y SWAP
12 *
13 * @reference
14 * http://www.fractalforums.com/mandelbulb-3d/custom-formulas-and-transforms-release-t17106/
15 */
16
17 #include "all_fractal_definitions.h"
18
cFractalAmazingSurf()19 cFractalAmazingSurf::cFractalAmazingSurf() : cAbstractFractal()
20 {
21 nameInComboBox = "Amazing Surf";
22 internalName = "amazing_surf";
23 internalID = fractal::amazingSurf;
24 DEType = analyticDEType;
25 DEFunctionType = linearDEFunction;
26 cpixelAddition = cpixelEnabledByDefault;
27 defaultBailout = 100.0;
28 DEAnalyticFunction = analyticFunctionLinear;
29 coloringFunction = coloringFunctionAmazingSurf;
30 }
31
FormulaCode(CVector4 & z,const sFractal * fractal,sExtendedAux & aux)32 void cFractalAmazingSurf::FormulaCode(CVector4 &z, const sFractal *fractal, sExtendedAux &aux)
33 {
34 // update aux.actualScale
35 aux.actualScale =
36 fractal->mandelbox.scale + fractal->mandelboxVary4D.scaleVary * (fabs(aux.actualScale) - 1.0);
37
38 CVector4 c = aux.const_c;
39 z.x = fabs(z.x + fractal->transformCommon.additionConstant111.x)
40 - fabs(z.x - fractal->transformCommon.additionConstant111.x) - z.x;
41 z.y = fabs(z.y + fractal->transformCommon.additionConstant111.y)
42 - fabs(z.y - fractal->transformCommon.additionConstant111.y) - z.y;
43 // no z fold
44
45 double rr = z.Dot(z);
46 if (fractal->transformCommon.functionEnabledFalse) // force cylinder fold
47 rr -= z.z * z.z;
48
49 double sqrtMinR = sqrt(fractal->transformCommon.minR05);
50 double dividend = rr < sqrtMinR ? sqrtMinR : min(rr, 1.0);
51
52 /*if (rr < sqrtMinR)
53 {
54 aux.color += fractal->mandelbox.color.factorSp1;
55 }
56 else if (rr < 1.0)
57 {
58 aux.color += fractal->mandelbox.color.factorSp2;
59 }*/
60 // use aux.actualScale
61 double m = aux.actualScale / dividend;
62
63 z *= (m - 1.0) * fractal->transformCommon.scale1 + 1.0;
64 // z *= m * fractal->transformCommon.scale1 + 1.0 * (1.0 - fractal->transformCommon.scale1);
65 aux.DE = aux.DE * fabs(m) + 1.0;
66
67 if (fractal->transformCommon.addCpixelEnabledFalse)
68 z += CVector4(c.y, c.x, c.z, c.w) * fractal->transformCommon.constantMultiplier111;
69
70 z = fractal->transformCommon.rotationMatrix.RotateVector(z);
71 }
72