RealBrush

Lu, Jingwan; Barnes, Connelly; DiVerdi, Stephen; Finkelstein, Adam

doi:10.1145/2461912.2461998

Cited by 67 publications

(9 citation statements)

References 23 publications

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“…Stroke visibility may be "haloed" for greater clarity (Elber, 1995b). More sophisticated texture-based stroke models include "RealBrush", which uses multiple scanned paint strokes to model paint mixing (Lu et al, 2013) and "DecoBrush" (Lu et al, 2014), which uses procedurally-defined line art textures. These stroke textures may also be drawn directly in a WYSIWYG interface (Kalnins et al, 2002;Saito, 2015, 2016).…”

Section: Stroke Renderingmentioning

confidence: 99%

Line Drawings from 3D Models: A Tutorial

Bénard¹,

Hertzmann²

2019

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This tutorial describes the geometry and algorithms for generating line drawings from 3D models, focusing on occluding contours.The geometry of occluding contours on meshes and on smooth surfaces is described in detail, together with algorithms for extracting contours, computing their visibility, and creating stylized renderings and animations. Exact methods and hardware-accelerated fast methods are both described, and the trade-offs between different methods are discussed. The tutorial brings together and organizes material that, at present, is scattered throughout the literature. It also includes some novel explanations, and implementation tips.We believe that these topics ought to be known by anyone interested in understanding the curves in visual representational art. It is one where computer graphics can make a unique contribution. Arguably, the algorithmic simulation of line drawing is a crucial step in understanding visual art. Occluding contoursThis tutorial focuses on the curves known as occluding contours or, simply contours. In some computer graphics research, these have been called silhouettes, though the silhouettes are technically a separate set of curves, as we will describe below.The occluding contours of a simple 3D object are shown in Figure 1.1. As a first definition, suppose we have a 3D object that we wish to render from a specific viewpoint. The occluding contours are surface curves that separate visible parts from invisible parts. By rendering the visible portions of these 3D curves together with the object, we get a basic line drawing (Figure 1.1b).There are many different contour detection and rendering algorithms, and some significant tradeoffs between them. The most important tradeoff is between simple algorithms that produce approximate results, and more complex algorithms that give more precision, control, and stylization capabilities. Just rendering reasonable-looking contours as solid black lines is very straightforward for a graphics programmer. These most basic algorithms can be implemented in a few additional lines of code in an existing renderer, and have been implemented in many real-time applications, including many popular video games (one of the earliest was Jet Set Radio in 2000). However, if we wish to stylize the curves, for example, by rendering the curves with sketchy or calligraphic strokes (Figure 1.1d), things become more difficult. With a bit of perseverance, renderings with distinctive and lovely styles can be created. At times, these renderings may still contain topological artifacts that are not suitable for very high-end production. High-quality algorithms that remove these artifacts are more complex; in the extreme, no provably-correct algorithm exists for this problem. However, there are a number of partial solutions that are good enough to be used in many circumstances, and we discuss in detail the issues involved.Note that, formally, the occluding contour and occluding contour generator are separate curves in 2D and 3D. However, we will frequently use the te...

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Section: Stroke Renderingmentioning

confidence: 99%

Line Drawings from 3D Models: A Tutorial

Bénard¹,

Hertzmann²

2019

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“…By design-based implementation research, teachers designed a student-centered unit aligned to the Next Generation Science Standards (NGSS) in which classroom technology is applied together with researchers and course specialists. Lu [8] applied 3D digital technique in painting teaching, and put forward an interactive and data-driven painting system which applies scanned images of real natural media to synthesize both new strokes and complex stroke interactions, which obviates the need for physical simulation. Teaching practice showed that, 3D digital technique is more beneficial to improve art effect of painting.…”

Section: State Of the Artmentioning

confidence: 99%

Illustration Design Teaching Mode Based on Virtual Wall Painting Technology

Zhang¹

2019

Int. J. Emerg. Technol. Learn.

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With rapid development of 3D virtual scene, virtual reality (VR) technology starts to be applied in teaching practice. Because of its conception and innovation, VR technology has certain advantage in art creation learning and teaching. In traditional art course teaching, theoretical knowledge is more than design practice, and the depth of design cases is insufficient. Thus, students lack driving force of art creation. On this basis, wall painting technology and VR technology were combined and applied in the course of Illustration Design in this paper. According to the course requirement of Illustration Design – many design cases, Illustration Design teaching mode based on virtual wall painting technology was constructed. The study result showed that, students more approved the new teaching mode, their interest improved greatly and teaching efficiency boosted significantly. The teaching mode can make up for defects of traditional art design teaching mode and contributes to cultivating students’ art creation ability.

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“…Related to fabrication of paintings, non-photorealistic rendering aims to generate stylized compositions that reflect artistic intent [Bot09, BNTS07, HE04, WWF * 14, LC14, CAS * 97, SLKD16]. Projects about simulation of different painting media, including watercolor, create a virtual painting or investigate the properties of the media [CKIW15,LBDF13]. We aim to fabricate an artistic version similar to the non-photorealistic rendering based on the input photograph.…”

Section: Related Workmentioning

confidence: 99%

Watercolor Woodblock Printing with Image Analysis

Panotopoulou

Paris

Whiting

2018

Computer Graphics Forum

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Watercolor paintings have a unique look that mixes subtle color gradients and sophisticated diffusion patterns. This makes them immediately recognizable and gives them a unique appeal. Creating such paintings requires advanced skills that are beyond the reach of most people. Even for trained artists, producing several copies of a painting is a tedious task. One can resort to scanning an existing painting and printing replicas, but these are all identical and have lost an essential characteristic of a painting, its uniqueness. We address these two issues with a technique to fabricate woodblocks that we later use to create watercolor prints. The woodblocks can be reused to produce multiple copies but each print is unique due to the physical process that we introduce. We also design an image processing pipeline that helps users to create the woodblocks and describe a protocol that produces prints by carefully controlling the interplay between the paper, ink pigments, and water so that the final piece depicts the desired scene while exhibiting the distinctive features of watercolor. Our technique enables anyone with the resources to produce watercolor prints.

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RealBrush

Cited by 67 publications

References 23 publications

Line Drawings from 3D Models: A Tutorial

Line Drawings from 3D Models: A Tutorial

Illustration Design Teaching Mode Based on Virtual Wall Painting Technology

Watercolor Woodblock Printing with Image Analysis

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