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Mandelbulb

The Mandelbulb is a three-dimensional object that extends the iconic two-dimensional into three dimensions, characterized by infinite and intricate, bulbous structures resembling natural forms like . Developed collaboratively by amateur enthusiasts Daniel White and Paul Nylander, it emerged from experiments beginning in November 2007 on the Forums , with White publishing the initial formula and Nylander refining it by incorporating higher powers for enhanced detail. Mathematically, the Mandelbulb is defined in spherical coordinates (\rho, \theta, \phi) by iterating the map T_c(X) = X^n + c, where X^n = (\rho^n, n\theta, n\phi) and n is typically 8 to achieve balanced fractal complexity, with the set comprising points c for which the orbit of the origin remains bounded. This geometric iteration avoids traditional complex numbers, instead using polar decomposition to scale the radius and multiply the angles, producing a structure with exquisite detail across all axes when rendered at high resolutions. First rendered in three dimensions by Thomas Ludwig in 2007 and gaining widespread attention in 2009 through deep zooms revealing endless budding patterns, the Mandelbulb has inspired software tools like Mandelbulb3D for exploration and artistic visualization. Unlike the , whose connectivity is mathematically proven, the Mandelbulb's topological properties—such as whether its body is simply connected—remain an open research question in geometry. Its discovery highlighted the potential for community-driven innovation in , blending , , and natural .

Introduction

Definition

The Mandelbulb is a three-dimensional defined as the set of points c = (x_c, y_c, z_c) \in \mathbb{R}^3 such that the sequence of iterates v_0 = 0, v_{k+1} = v_k^n + c remains bounded for all k, where n \geq 2 is typically an even and the power is interpreted in spherical coordinates to extend the geometry of the two-dimensional . This boundedness condition mirrors the 's definition in the , where points c yield orbits under squaring and translation that do not escape to infinity. To apply the power n, a vector v = (x, y, z) is first transformed into spherical coordinates: r = \sqrt{x^2 + y^2 + z^2}, \theta = \arccos(z / r) (the polar angle from the positive z-axis), and \phi = \atan2(y, x) (the azimuthal angle in the xy-plane). The nth power is then given by v^n = r^n \begin{pmatrix} \sin(n \theta) \cos(n \phi) \\ \sin(n \theta) \sin(n \phi) \\ \cos(n \theta) \end{pmatrix}, which scales the radius by r^n and multiplies the angles by n, before converting back to Cartesian coordinates for the iteration. The process begins at the origin v_0 = (0, 0, 0), with c added after each power operation, ensuring the transformation preserves the rotational symmetry needed for fractal structure in three dimensions. No canonical three-dimensional analog to the exists, as \mathbb{R}^3 lacks a normed like the complex numbers for two dimensions or quaternions for four dimensions, leading to heuristic extensions such as the Mandelbulb's spherical formulation.

History

The was developed collaboratively by amateur enthusiasts Daniel White and Paul Nylander starting in November 2007 on the online community. White published the initial for a degree-2 version (sometimes called the Mandelbug), while Nylander refined it by suggesting higher powers, such as 8, to reveal more intricate details. The first three-dimensional rendering of the power-2 was created by Thomas Ludwig on November 20, 2007. Earlier explorations of similar ideas date back to Rudy Rucker's experiments in 1988 and Jules Ruis's program in 1997, but the 2007 formulation marked the modern discovery. The gained widespread attention in 2009 through deep zoom renders and media coverage, such as a article on November 18, 2009, highlighting its organic, self-similar structures.

Mathematical Formulation

General Framework

The Mandelbulb is a three-dimensional set defined through an iterative mapping process in \mathbb{R}^3, extending the concept of the two-dimensional to higher dimensions while preserving self-similar properties. The process begins with the initial \mathbf{v}_0 = (0, 0, 0) for a given parameter \mathbf{c} \in \mathbb{R}^3, and iterates according to the map \mathbf{v}_{n+1} = \mathbf{v}_n^p + \mathbf{c}, where p > 1 is a fixed power parameter that controls the degree of the transformation. This formulation assumes familiarity with basic fractal iteration, where sequences in the are generalized to operations in three-dimensional , treating \mathbf{c} as the "" point analogous to complex parameters in the . To compute the powering operation \mathbf{v}^p meaningfully in 3D—beyond naive component-wise exponentiation, which lacks rotational invariance—spherical coordinates are employed, generalizing the polar coordinate approach used in the 2D Mandelbrot iteration z_{n+1} = z_n^2 + c. A vector \mathbf{v} = (x, y, z) is first decomposed into its spherical form: radius r = \|\mathbf{v}\| = \sqrt{x^2 + y^2 + z^2}, polar angle \theta = \arccos(y / r), and azimuthal angle \phi = \atantwo(x, z). The powered vector is then obtained by scaling the radius to r^p and multiplying the angles by p, yielding \theta' = p \theta and \phi' = p \phi, before converting back to Cartesian coordinates via: \begin{align*} x' &= r^p \sin(\theta') \sin(\phi'), \\ y' &= r^p \cos(\theta'), \\ z' &= r^p \sin(\theta') \cos(\phi'). \end{align*} This geometric interpretation ensures the transformation respects the spherical symmetry of 3D space, producing intricate, bulbous structures with recursive detail. Membership in the Mandelbulb set is determined using an escape-time : for each \mathbf{c}, the iteration proceeds until either \|\mathbf{v}_n\| > R (where R is a bailout , commonly 2 or 4) or a maximum count N (e.g., 100–255) is reached without escape. Points \mathbf{c} for which the sequence \{\mathbf{v}_n\} remains bounded—i.e., does not diverge to infinity—are considered part of the set, mirroring the boundedness criterion of the . The choice of p = 8 serves as the baseline for the original formulation, balancing complexity and visual coherence, though the framework accommodates other integer powers.

Original Power-8 Formula

The original Mandelbulb formulation uses p = 8 in the general iterative \mathbf{v}_{n+1} = \mathbf{v}_n^8 + \mathbf{c}. This power was selected by Daniel White and Paul Nylander after experimentation, as lower powers (e.g., 2) produce structures more akin to fractals, while higher powers create increasingly bulbous and spherically symmetric forms; p = 8 achieves a desirable balance of intricate, self-similar details resembling organic shapes without excessive . The powering operation follows the spherical coordinate method described in the general framework, with the radius raised to the 8th power and angles multiplied by 8, ensuring rotational invariance and rich structure.

Iteration and Boundedness

The iteration process for the Mandelbulb, using the original power-8 formula, starts by initializing the \mathbf{v}_0 = \mathbf{0}. Subsequent iterations compute \mathbf{v}_{n+1} = \mathbf{v}_n^8 + \mathbf{c}, where \mathbf{c} is the point in space being tested, and the eighth power is evaluated by converting \mathbf{v}_n to spherical coordinates, raising the to the eighth power, multiplying the angles by eight, and converting back to Cartesian coordinates. This loop runs for a maximum number of s, such as 100, or halts early if the |\mathbf{v}_n| exceeds a , typically set to 4. The Mandelbulb set comprises all points \mathbf{c} for which the sequence \mathbf{v}_n remains bounded, meaning |\mathbf{v}_n| stays below the bailout radius indefinitely. In practice, boundedness is approximated by checking whether the sequence escapes within the allotted maximum iterations; if it does not, \mathbf{c} is considered part of the set. For visualizations, escape-time coloring assigns hues to points outside the set based on the iteration count at which |\mathbf{v}_n| surpasses the bailout radius, with lower counts yielding one color range and higher counts another, enhancing the depiction of the fractal's boundary structure. Rendering the Mandelbulb demands high counts, often exceeding 100 and reaching thousands for deep zooms, owing to the in complexity from the transformation, which amplifies the need for precise tracking to resolve intricate surface details.

Formula Variations

Cubic Formula

The cubic formula represents the -3 variation of the Mandelbulb, often implemented using spherical coordinates for isotropic or a Cartesian for axisymmetric cases around the x-axis. In spherical coordinates, convert (x, y, z) to (r, \theta, \phi) with r = \sqrt{x^2 + y^2 + z^2}, \theta = \arccos(z / r), \phi = \atan2(y, x); then r' = r^3, \theta' = 3\theta, \phi' = 3\phi; convert back to x' = r' \sin\theta' \cos\phi', y' = r' \sin\theta' \sin\phi', z' = r' \cos\theta'; and add (c_x, c_y, c_z). An axisymmetric Cartesian treats the yz-plane as a : x' = x^3 - 3x(y^2 + z^2) + c_x, while the y and z components are updated by the imaginary part $3x^2 \sqrt{y^2 + z^2} - (y^2 + z^2)^{3/2} (or its ) by the in the yz direction. This produces fractals with smoother, less spiky structures due to the odd power, exhibiting three-fold rotational tendencies in slices.

Quintic Formula

The quintic formula represents a power-5 variation of the Mandelbulb, generalizing the to higher odd powers. In this formulation, the update for the x-coordinate is given by x' = x^5 - 10x^3(y^2 + z^2) + 5x(y^4 + 2y^2 z^2 + z^4) + A(5x^4 y - 10 x^2 y^3 + 5 y^4 z) + B(5x^4 z - 10 x^2 z^3 + 5 z^4 y) + C(\dots) + D(\dots) + c_x, with analogous expressions for the y- and z-coordinates obtained by to ensure ; the constants A, B, C, D are typically set to 0 or 1 to control asymmetry or inversion effects. This cartesian expansion derives from the applied to a hypercomplex analogous to (x + iy + jz)^5, truncated or adjusted for computational efficiency and coherence. An alternative implementation uses spherical coordinates for the power-5 iteration: convert (x, y, z) to (r, \theta, \phi) where r = \sqrt{x^2 + y^2 + z^2}, \theta = \arccos(z / r), \phi = \atan2(y, x); then apply r' = r^5, \theta' = 5\theta, \phi' = 5\phi; convert back to cartesian coordinates x' = r' \sin\theta' \cos\phi', y' = r' \sin\theta' \sin\phi', z' = r' \cos\theta'; and add the perturbation (x', y', z') += (c_x, c_y, c_z). For inverted structures, the power can be negated as r' = (-r)^5 + c or similar adjustments to the angular multiplication, producing mirrored or reflected bulbs. The reduction of the quintic , corresponding to a slice in the xy-plane (z=0), follows the multibrot z \to z^5 + c with cartesian components x' = x^5 - 10x^3 y^2 + 5x y^4 + c_x and y' = 5x^4 y - 10 x^2 y^3 + y^5 + c_y, yielding a set with five-fold . Overall, the quintic variation generates fractals exhibiting pentagonal symmetries and smoother, more organic bulbous forms than even-power precursors, with reduced spiking due to the odd power.

Power-Nine Formula

The power-nine formula represents a variation of the Mandelbulb that employs a Cartesian approach to extend the to an odd power, preserving in the yz-plane while allowing for more intricate structural details than even-power formulations. This method treats the point (x, y, z) as a complex-like structure where the yz-plane is represented by its , enabling a expansion analogous to in . The transformation for the x-component is given by the real part of the ninth power in this pseudo-complex form, added to the parameter c_x. The short form for the x-component update is: x' = \frac{1}{2} \left[ \left( x + i \sqrt{y^2 + z^2} \right)^9 + \left( x - i \sqrt{y^2 + z^2} \right)^9 \right] + c_x Expanding this using the binomial theorem yields the polynomial expression: x' = x^9 - 36 x^7 (y^2 + z^2) + 126 x^5 (y^2 + z^2)^2 - 84 x^3 (y^2 + z^2)^3 + 9 x (y^2 + z^2)^4 + c_x Analogous expressions apply to the y- and z-components, where the imaginary part of the expansion is projected back onto the yz-plane to maintain the direction: the magnitude of the imaginary part is computed similarly, then scaled by the unit vector (y / \sqrt{y^2 + z^2}, z / \sqrt{y^2 + z^2}). This formulation ensures the iteration remains bounded within a spherical region, similar to lower-power variants, but introduces finer geometric complexity. A key feature of the power-nine formula is its generation of structures featuring 32 small bulbs emerging from the central sphere, providing enhanced and recursive compared to the power-eight variant's coarser budding patterns. This increased multiplicity arises from the odd exponent's influence on angular in the underlying , resulting in more pronounced branching. For computational efficiency, particularly in rendering, the power-nine transformation can be approximated by composing multiple lower-power iterations, such as applying three cubic (power-three) s in sequence to simulate the ninth power effect, though this introduces minor distortions in boundedness checks. The quintic serves as an intermediate odd-power , bridging basic cubic to the richer of power-nine.

Spherical Formula

The spherical formula represents a key variation of the Mandelbulb that extends the 2D Mandelbrot set's polar coordinate powering to three dimensions, emphasizing exact preservation of spherical symmetry through . In this formulation, a point (x, y, z) is transformed by first converting it to spherical coordinates: r = \sqrt{x^2 + y^2 + z^2}, \theta = \atan2(y, x), \phi = \acos(z / r). The powered coordinates are then r' = r^n, \theta' = n \theta, \phi' = n \phi, and converted back via \begin{align*} x' &= r' \sin(\phi') \cos(\theta'), \\ y' &= r' \sin(\phi') \sin(\theta'), \\ z' &= r' \cos(\phi'). \end{align*} The proceeds as (x', y', z') + (c_x, c_y, c_z), where (c_x, c_y, c_z) is the fixed point. This structure ensures (x'^2 + y'^2 + z'^2) = (x^2 + y^2 + z^2)^n, maintaining the radius scaling and angular multiplication essential for across all axes. Unlike polynomial-based variations, which rely on algebraic expansions that may introduce approximations for higher powers, the spherical formula uses multiples directly on the angles to achieve precise without transcendental overhead in conceptual design, though computational implementations often optimize via precomputed identities. It supports arbitrary or non-integer n, enabling flexible exploration of morphologies; for instance, non-integer powers like n = 7.5 yield transitional shapes between bulbous and spiky forms, while adaptations might offset angles (e.g., adding \pi/2 to \phi) or blend with Cartesian scaling for asymmetric customizations. In general, the can be expressed in form as \mathbf{z}' = (f(x,y,z), g(x,y,z), h(x,y,z)) + \mathbf{c}, where f, g, h are the trigonometric components derived from the spherical powering, satisfying the norm preservation condition exactly for any n. This approach, pioneered in the Mandelbulb , allows additional parameters such as angle offsets or scaling factors to tune the resulting beyond rigid laws.

Properties and Visualization

Fractal Properties

The Mandelbulb exhibits , where infinite zooming into its structure reveals repeating patterns of bulbous forms at progressively smaller scales, analogous to the iterative dynamics observed in the 2D . This property arises from the iterative application of the powering operation in spherical coordinates, allowing the fractal to display intricate, scale-invariant details throughout its volume. Topologically, the Mandelbulb is a connected set in \mathbb{R}^3, characterized by bounded orbits under starting from the , though the full extent of its connectivity remains an . Its structure contributes to an organic appearance, with the overall topology influenced by the degree of the powering function. An analog to sets in the context corresponds to fixed parameters c in the , producing filled sets that vary based on the choice of c and exhibit similar self-similar boundaries. These sets can be visualized through slices or , revealing 2D-like patterns embedded in space. Unlike the 2D , which operates over complex numbers and yields cardioid and circular bulbs, the Mandelbulb's use of spherical coordinates and higher-degree powering results in more organic, bulbous forms with enhanced three-dimensional complexity. Variations in the power n, such as the commonly used n=8, alter the surface complexity and symmetry, with higher powers generally producing more intricate and symmetric structures.

Rendering Techniques

Rendering the Mandelbulb primarily relies on algorithms augmented by distance estimation techniques, which leverage (SDFs) to approximate the distance from any point to the fractal's surface. In this approach, rays are cast from the viewpoint into the scene, advancing in steps proportional to the SDF value until the surface is intersected, enabling efficient traversal of the complex geometry without exhaustive sampling. This method is particularly suited to the Mandelbulb's intricate, self-similar structure, allowing for volumetric rendering and surface shading based on iteration counts from the escape-time algorithm. Key software tools facilitate these computations, with Mandelbulb3D serving as a prominent application available since , offering user-friendly interfaces for formula customization, real-time previews, and high-quality exports across Windows, , and platforms. Complementing this are Fragmentarium, an open-source that utilizes GLSL shaders for GPU-accelerated exploration of distance-estimated fractals like the Mandelbulb, and , a web-based platform hosting numerous real-time GPU shaders that implement for interactive visualizations. These tools often integrate optimizations such as adaptive step sizes and bounding volumes to balance detail and performance. The rendering process incurs significant computational demands due to the intensive iterations required for each , often resulting in times of minutes to hours per on . To address this, optimizations include octree-based spatial partitioning to prune empty regions and early ray termination when opacity thresholds are met, alongside GPU parallelization via or for cluster-scale processing. For deep zooms revealing fine details, precision limitations in necessitate higher-precision arithmetic or adaptive schemes, though —typically used in 2D fractals to reduce redundant calculations—has limited direct application in 3D contexts but inspires similar delta-based approximations. Common output formats encompass high-resolution still images for static analysis, animations generated through keyframe tweening and sequence rendering, and immersive VR experiences via 360-degree stereoscopic projections. Typical resolutions reach 4K (3840×2160) with supersampling anti-aliasing—employing 9 to 45 sub-samples per pixel—to smooth edges and minimize artifacts in the fractal's intricate surfaces.

Applications

Uses in Media

The Mandelbulb has been employed in visual effects for several major films, leveraging its intricate, self-similar structures to depict otherworldly environments and entities. In the 2014 Disney animated film , the climactic portal sequence features a interior rendered using a Mandelbulb , with customized parameters to create swirling, -like visuals that enhance the sci-fi action. Similarly, the 2017 Marvel film Guardians of the Galaxy Vol. 2 incorporates 3D generated with Mandelbulb3D software by artist Hal Tenny to form exotic planetary landscapes, marking an early high-profile integration of the fractal into production design. In the 2018 science fiction film Annihilation, directed by , Mandelbulb-inspired fractals were used in the design of the surrounding crystalline structures and the Shimmer, including a translucent wall streaming with bulbous forms, as well as environmental elements like spores and , achieved through in pipelines. These applications highlight the Mandelbulb's utility in creating surreal, biologically evocative imagery that blends mathematical precision with narrative immersion. Beyond feature films, the Mandelbulb appears in independent shorts and , often produced using accessible tools like Mandelbulb3D to explore abstract, hypnotic animations. For instance, artist Julius Horsthuis has created animations such as "Our Fractal Brains" (2015), a that navigates Mandelbulb geometries synchronized to , screened at festivals and online platforms. Arthur Stammet's series of Mandelbulb3D-based shorts, including "Communication Craze in a Morphing World" (2012) and "Light Beings" (2025), combine fly-throughs with cinematic storytelling and soundtracks, distributed primarily on . The adoption of the Mandelbulb in media evolved rapidly after its 2009 discovery, transitioning from niche enthusiast renders to mainstream by the mid-2010s, facilitated by that enabled efficient rendering of complex scenes for film and digital content. This progression underscores rendering techniques like , which allow high-quality outputs suitable for integration into professional VFX workflows.

Artistic and Scientific Uses

The Mandelbulb has found significant application in , where artists leverage its intricate, self-similar structures to create visually compelling imagery. Belgian artist and mechanical engineer Jos Leys has produced a series of 36 digital artworks depicting the , generated through iterative processes in spherical coordinates, emphasizing its mathematical beauty and complexity. These works highlight the fractal's potential for , allowing artists to explore infinite variations in form and color. Additionally, the Mandelbulb inspires fractal sculptures via ; for instance, researchers at have 3D-printed Mandelbulb and inverted Mandelbulb models using FDM printers like the , demonstrating its translation from computational rendering to tangible art objects. communities, such as Fractal Forums, host annual competitions like the 10th Annual Competition in 2017, where participants submit Mandelbulb-based entries to showcase creative parameterizations and hybrid formulas. In scientific research, the Mandelbulb serves as a key object in and , extending the study of 2D Mandelbrot sets to higher dimensions through polynomial iterations like z^d + c. Oliver Knill's 2023 analysis explores its dynamical systems properties, including bounded orbits and connections to Jacobi matrices in , with applications in pseudo-random number for cryptology via Mandelbrot sets in finite rings. Its self-similar aids in modeling natural forms in , such as the branching structures of lungs, where dimensions quantify respiratory tree irregularity. The Mandelbulb's 3D also contribute to studies by visualizing nonlinear dynamics in spherical coordinates, providing insights into higher-dimensional beyond traditional iterations. Since its discovery in , the Mandelbulb has become an educational tool for teaching and in curricula. Resources like the Setzeus community blog use the Mandelbulb to illustrate how 2D Mandelbrot iterations extend to via power-8 formulas, helping students grasp , quaternions, and geometric transformations in dynamical systems. In the , the Mandelbulb integrates into emerging AI-generated art workflows, where renders serve as initial images for models like to produce hybrid artworks blending mathematical precision with stylistic enhancements. For physics simulations, dynamic variants of the Mandelbulb—incorporating time-dependent transformations—offer visualization tools for transient phenomena, such as the evolving structures in turbulent flows, as detailed in a 2025 Chaos, Solitons & Fractals paper.

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