Hidden curve removal for free form surfaces

ElberGershon,; CohenElaine,

doi:10.1145/97880.97890

Cited by 35 publications

(7 citation statements)

References 26 publications

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“…The various NPR methods differ greatly in style and visual appearance, but are all closely related to conventional artistic techniques (e.g., [6,8,10,13,14,16,20,26]). An underlying assumption in NPR is that artistic techniques developed by human artists have intrinsic merit based on the evolutionary nature of art.…”

Section: Related Workmentioning

confidence: 99%

A non-photorealistic lighting model for automatic technical illustration

Gooch

Shirley

et al. 1998

Proceedings of the 25th Annual Conference on Computer Graphics and Interactive Techniques - SIGGRAPH '98

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275

169

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Phong-shaded 3D imagery does not provide geometric information of the same richness as human-drawn technical illustrations. A non-photorealistic lighting model is presented that attempts to narrow this gap. The model is based on practice in traditional technical illustration, where the lighting model uses both luminance and changes in hue to indicate surface orientation, reserving extreme lights and darks for edge lines and highlights. The lighting model allows shading to occur only in mid-tones so that edge lines and highlights remain visually prominent. In addition, we show how this lighting model is modified when portraying models of metal objects. These illustration methods give a clearer picture of shape, structure, and material composition than traditional computer graphics methods.

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Section: Related Workmentioning

confidence: 99%

A non-photorealistic lighting model for automatic technical illustration

Gooch

Shirley

et al. 1998

Proceedings of the 25th Annual Conference on Computer Graphics and Interactive Techniques - SIGGRAPH '98

Self Cite

275

169

View full text Add to dashboard Cite

show abstract

“…Extracting the silhouette curve of an object has been used extensively for rendering [Appel 1968;Saito and Takahashi 1990], nonphotorealistic rendering, and hidden-line removal [Elber and Cohen 1990]. [Krishnan and Manocha 1997] make use of silhouette curves to perform global accessibility and visibility analysis by computing the visible portions of free-form surfaces from a given viewpoint.…”

Section: Related Workmentioning

confidence: 99%

Accelerating geometric queries using the GPU

Krishnamurthy

McMains

Halle

2009

2009 SIAM/ACM Joint Conference on Geometric and Physical Modeling

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Figure 1: Geometric operations such as silhouette curve extraction and minimum distance/closest point computations between NURBS surfaces and complex CAD models accelerated using the GPU. AbstractWe present practical algorithms for accelerating geometric queries on models made of NURBS surfaces using programmable Graphics Processing Units (GPUs). We provide a generalized framework for using GPUs as co-processors in accelerating CAD operations. By attaching the data corresponding to surface-normals to a surface bounding-box structure, we can calculate view-dependent geometric features such as silhouette curves in real time. We make use of additional surface data linked to surface bounding-box hierarchies on the GPU to answer queries such as finding the closest point on a curved NURBS surface given any point in space and evaluating the clearance between two solid models constructed using multiple NURBS surfaces. We simultaneously output the parameter values corresponding to the solution of these queries along with the model space values. Though our algorithms make use of the programmable fragment processor, the accuracy is based on the model space precision, unlike earlier graphics algorithms that were based only on image space precision. In addition, we provide theoretical bounds for both the computed minimum distance values as well as the location of the closest point. Our algorithms are at least an order of magnitude faster than the commercial solid modeling kernel ACIS.

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“…Commonly-used strokes include contours, creases, hatching, and suggestive contours [DeCarlo et al 2003;DeCarlo et al 2004;Elber and Cohen 1990;Gooch et al 1999;Grabli et al 2004;Hertzmann and Zorin 2000;Markosian et al 1997;Saito and Takahashi 1990;Sousa and Prusinkiewicz 2003;Winkenbach and Salesin 1994]. While these strokes provide effective choices of lines to draw, less is known about how to determine stroke thickness.…”

Section: Relation To Previous Workmentioning

confidence: 99%

Isophote distance

Goodwin

Vollick

Hertzmann

2007

Proceedings of the 5th International Symposium on Non-Photorealistic Animation and Rendering

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This paper presents an approach for determining stroke thickness in computer-generated illustrations of smooth surfaces. We assume that dark strokes are drawn to approximate the dark regions of the shaded surface. This assumption leads to a simple formula for thickness of contours and suggestive contours; this formula depends on depth, radial curvature, and light direction in a manner that reproduces aspects of thickness observed in hand-made drawings. These strokes convey local shape and depth relationships, and produce appealing imagery. Our method is simple to implement, provides temporally-coherent strokes, and runs at interactive rates.

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Hidden curve removal for free form surfaces

Cited by 35 publications

References 26 publications

A non-photorealistic lighting model for automatic technical illustration

A non-photorealistic lighting model for automatic technical illustration

Accelerating geometric queries using the GPU

Isophote distance

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