Editing level-set models with sketched curves

Eyiyurekli, Manolya; Grimm, Cindy; Breen, David E.

doi:10.1145/1572741.1572750

Cited by 6 publications

(3 citation statements)

References 35 publications

(23 reference statements)

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“…Implicit surfaces are usually taken as modelling primitives, as they can deal with complex topology changes. Many systems such as BlobTrees, radial basis function‐based, and level set‐based are all based on implicit surfaces. Implicit surface‐based methods can generate smooth models with complex topology more easily than those based on explicit surfaces .…”

Section: Related Workmentioning

confidence: 99%

Brush2Model: Convolution surface‐based brushes for 3D modelling in head‐mounted display‐based virtual environments

Zhu

Song

You

et al. 2017

Computer Animation & Virtual

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Easy and efficient 3D modelling in virtual environments is an important and unsolved topic. This paper proposes a new modelling approach to tackle this issue. It invents convolution surface-based brushes to directly draw 3D models in head-mounted display-based virtual environments. In order to maximize the efficiency, flexibility, and capacity of our proposed modelling approach, we propose three different skeleton-based convolution surfaces to tackle different modelling tasks: point skeleton-based convolution surfaces for metaball shapes, line skeleton-based convolution surfaces for cylindrical shapes, and polygon skeleton-based convolution surfaces for planar surfaces. Their combination makes 3D modelling more flexible and powerful. The high efficiency is further raised by our developed closed-form solutions for point skeletons, ends of line skeletons, and edges of polygonal skeletons. Different user-friendly sweeping schemes are provided to facilitate intuitive inputs for various complex shape generation. Unlike Google's Tilt Brush, which is used to create disconnected sheet-like surfaces only, our proposed convolution surface-based brushes can produce smoothly blended manifold surfaces, and novice users can easily learn and use them to create various interesting 3D models efficiently. KEYWORDS brush-based 3D modelling, convolution surfaces, closed-form analytical solutions, HMD-based virtual environments Comput Anim Virtual Worlds. 2017;28:e1764.wileyonlinelibrary.com/journal/cav

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Section: Related Workmentioning

confidence: 99%

Brush2Model: Convolution surface‐based brushes for 3D modelling in head‐mounted display‐based virtual environments

Zhu

Song

You

et al. 2017

Computer Animation & Virtual

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“…During interactive sculpting this cost is amortized over many frames, but in the implicit context each evaluation of the scalar field would require a prohibitively expensive reverse-integration along the entire path. A recent curve-based sculpting technique for level-set models [9] has similar limitations, and also involves a temporal component in the form of per-frame partial differential equation (PDE) evolution. In this case the result is not strictly a spatial deformation and cannot be directly applied to functional implicit models.…”

Section: Related Workmentioning

confidence: 99%

WarpCurves: A tool for explicit manipulation of implicit surfaces

Sugihara

Wyvill

Schmidt

2010

Computers & Graphics

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We introduce WarpCurves, a technique for interactively manipulating an implicit surface using curve-based spatial deformations. Although implicit surfaces have several advantages in 3D modeling, current workflows are limited by the compositional nature of implicit modeling. Wide classes of surface features that are easy to create with the direct manipulation tools available for explicit surface representations are difficult to reproduce using volumetric implicit operations. We describe a novel spatial deformation that can be used to approximate direct surface manipulation. With our method an artist first draws a curve on the current surface to indicate the feature region-of-interest. Deformations applied to this handle curve are transferred to the implicit surface via an automatically-constructed C 2 continuous space mapping. Additional curves can be added in a hierarchical manner to create complex shapes. Our technique is implemented as a node in the BlobTree hierarchical implicit volume representation, and hence can be used along with other volumetric nodes (operators) such as blending and CSG. Our results show that surface deformations which would be difficult to reproduce using existing volumetric operations can be quickly constructed using warp curves, making them a valuable addition to the implicit modeling toolbox.

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“…solving the unwanted blending problem ) has been a major area of research in implicit modelling and animation. While efficient solutions have been proposed for level set implicit surfaces [MBWB02, BMPB08, EGB09], no fully satisfactory technique has been developped for functionally‐based implicit surfaces. Up to now, two families of solutions arose: The first ones used a blending graph to define pairs of primitives allowed to blend, i.e.…”

Section: Introductionmentioning

confidence: 99%

Implicit Blending Revisited

Bernhardt

Barthe

Cani

et al. 2010

Computer Graphics Forum

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Figure 1: Models generated interactively using a new approach to implicit blending. Note the capability of the shapes to come close to each other without blending. From left to right : The dragon, a dancer loop, the alien, a tree. AbstractBlending is both the strength and the weakness of functionally based implicit surfaces (such as F-reps or softobjects). While it gives them the unique ability to smoothly merge into a single, arbitrary shape, it makes implicit modelling hard to control since implicit surfaces blend at a distance, in a way that heavily depends on the slope of the field functions that define them. This paper presents a novel, generic solution to blending of functionally-based implicit surfaces: the insight is that to be intuitive and easy to control, blends should be located where two objects overlap, while enabling other parts of the objects to come as close to each other as desired without being deformed. Our solution relies on automatically defined blending regions around the intersection curves between two objects. Outside of these volumes, a clean union of the objects is computed thanks to a new operator that guarantees the smoothness of the resulting field function; meanwhile, a smooth blend is generated inside the blending regions. Parameters can automatically be tuned in order to prevent small objects from blurring out when blended into larger ones, and to generate a progressive blend when two animated objects come in contact.

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Editing level-set models with sketched curves

Cited by 6 publications

References 35 publications

Brush2Model: Convolution surface‐based brushes for 3D modelling in head‐mounted display‐based virtual environments

Brush2Model: Convolution surface‐based brushes for 3D modelling in head‐mounted display‐based virtual environments

WarpCurves: A tool for explicit manipulation of implicit surfaces

Implicit Blending Revisited

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