Procedural band patterns

Etienne, Jimmy; Lefèbvre, Sylvain

doi:10.1145/3384382.3384522

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…The authors report a synthesis performance for geometric surfaces from less than a second up to 3 minutes. Recently, by applying a parameter field and a density field for controlling the appearance, ETIENNE et al [EL20] present the procedural generation of band patterns as pixel shader in real time. Both fields can be controlled by image input.…”

Section: Santoni Et Al [Sp16] and Gieseke Et Al [Galf17] Presentmentioning

confidence: 99%

A Survey of Control Mechanisms for Creative Pattern Generation

Asente

Mĕch

Beneš

et al. 2021

Computer Graphics Forum

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We review recent methods in 2D creative pattern generation and their control mechanisms, focusing on procedural methods. The review is motivated by an artist's perspective and investigates interactive pattern generation as a complex design problem. While the repetitive nature of patterns is well-suited to algorithmic creation and automation, an artist needs more flexible control mechanisms for adaptable and inventive designs. We organize the state of the art around pattern design features, such as repetition, frames, curves, directionality, and single visual accents. Within those areas, we summarize and discuss the techniques' control mechanisms for enabling artist intent. The discussion includes questions of how input is given by the artist, what type of content the artist inputs, where the input affects the canvas spatially, and when input can be given in the timeline of the creation process. We categorize the available control mechanisms on an algorithmic level and categorize their input modes based on exemplars, parameterization, handling, filling, guiding, and placing interactions. To better understand the potential of the current techniques for creative design and to make such an investigation more manageable, we motivate our discussion with how navigation, transparency, variation, and stimulation enable creativity. We conclude our review by identifying possible new directions that can inspire innovation for artist-centered creation processes and algorithms. CCS Concepts• Computing methodologies → Computer graphics; • Human-centered computing → Interaction design process and methods; Interaction design theory, concepts and paradigms; Systems and tools for interaction design;

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Section: Santoni Et Al [Sp16] and Gieseke Et Al [Galf17] Presentmentioning

confidence: 99%

A Survey of Control Mechanisms for Creative Pattern Generation

Asente

Mĕch

Beneš

et al. 2021

Computer Graphics Forum

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“…However, there is no specific treatment for maintaining a constant spacing between trajectories. Ezair et al [2018] propose a curved slicing approach that has the potential to address this issue, as the trajectories are extracted from a given tri-variate field while maintaining their spacing by hierarchical subdivision [Elber and Cohen 1996;Etienne and Lefebvre 2020]. Fang et al [2020] extract curved trajectories as iso-values of a field that is specially optimized to enforce spacing and direction constraints.…”

Section: Previous Workmentioning

confidence: 99%

“…In addition, the gaps occur along specific transition curves of the field, which in turn leads to coherent defects within and across layers, weakening the overall part structure. Note that other curves extraction techniques could alleviate this problem [Etienne and Lefebvre 2020], but this has not been demonstrated for dense infills.…”

Section: Comparison To Curve Hierarchiesmentioning

confidence: 99%

A brick in the wall: Staggered orientable infills for additive manufacturing

Tricard

Etienne

Zanni

et al. 2021

Symposium on Computational Fabrication

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Fig. 1. Our technique generates dense planar infill trajectories, precisely following an input direction field. Through the anisotropy of the deposition process, the direction field controls the appearance and the physical properties of the 3D printed object. The trajectories are arranged in a staggered layout across layers. Left: A 3D printed gear where the direction of the trajectories is parameterized to adapt to the functionality of the part. Here, trajectories are mostly circular in the rim and hub while being aligned with the spokes. Note the staggered layout in the side views. Right: The anisotropy of the deposition results in anisotropy in the specular reflectance.Here, this is controlled to pattern the appearance of an otherwise flat part, resulting in a brushed metal effect.Additive manufacturing is typically conducted in a layer-by-layer fashion. A key step of the process is to define, within each planar layer, the trajectories along which material is deposited to form the final shape. The direction of these trajectories triggers an anisotropy in the fabricated parts, which directly affects their properties, from their mechanical behavior to their appearance. Controlling this anisotropy paves the way to novel applications, from stronger parts to controlled deformations and surface patterning.This work introduces a method to generate trajectories that precisely follow an input direction field while simultaneously avoiding intra-and inter-layer defects. Our method results in spatially coherent trajectories -all follow the specified direction field throughout the layers -while providing precise control over their inter-layer arrangement. This allows us to generate a staggered layout of trajectories across layers, preventing unavoidable tiny gaps from forming tunnel-shaped voids throughout a part volume.Our approach is simple, robust, easy to implement, and scales linearly with the input volume. It builds upon recent results in procedural generation of oscillating patterns, generating a signal in the 3D domain that oscillates with a frequency matching the deposition beads width while following the input direction field. Trajectories are extracted with a process akin to a marching square.

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