Fast and memory efficient view-dependent trimmed NURBS rendering

Guthe, Michael; Meseth, Jan; Klein, Reinhard

doi:10.1109/pccga.2002.1167860

Cited by 11 publications

(9 citation statements)

References 33 publications

(33 reference statements)

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“…This method was further enhanced by building a seam graph structure on the tessellated trimmed NURBS surface for multi-resolution modelling. 4 A seam graph structure is actually a progressive mesh-like 18 structure. It allows the application to select an appropriate resolution of the tessellated polygon model for rendering.…”

Section: Related Workmentioning

confidence: 99%

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Efficient rendering of deformable objects for real‐time applications

Cheung¹,

Lau²,

2006

Computer Animation & Virtual

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Deformable objects can be used to model soft objects such as clothing, human faces and animal characters. They are important as they can improve the realism of the applications. However, most existing hardware accelerators cannot render deformable objects directly. A tessellation process is often used to convert a deformable object into polygons so that the hardware graphics accelerator may render them. Unfortunately, this tessellation process is computationally very expensive. While the object is deforming, the tessellation process needs to be performed repeatedly to convert the deforming objects into polygons. As a result, deformable objects are seldom used in real-time applications such as virtual environments and computer games. Since trimmed NURBS surfaces are often used to represent deformable objects, in this paper we present an efficient method for incremental rendering of deformable trimmed NURBS surfaces. A trimmed NURBS surface typically deforms through the deformation of the trimmed NURBS surface and/or the trimming curve. Our method handles both trimmed surface deformation as well as trimming curve deformation. Experimental results show that our method performs significantly faster than the method used in OpenGL and can be used in real-time applications, such as computer games.

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Section: Related Workmentioning

confidence: 99%

“…Most of the methods developed are based on tessellation. [3][4][5][6][7][8] This tessellation process subdivides the NURBS surfaces into polygons so that the hardware graphics accelerator may render the polygons in real time. However, this tessellation process is computationally very expensive.…”

Section: Introductionmentioning

confidence: 99%

Efficient rendering of deformable objects for real‐time applications

Cheung¹,

Lau²,

2006

Computer Animation & Virtual

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“…Otherwise, the node is further subdivided for further processing or be tessellated by constrained delaunay triangulation to generate the output polygons. This method was further enhanced by building a seam graph structure on the tessellated trimmed NURBS surfaces for multi-resolution modeling [6]. A seam graph structure is actually a progressive mesh [7] like structure.…”

Section: Related Workmentioning

confidence: 99%

“…There have been a lot of work carried out to address this problem. Most of the methods developed are based on tessellation [1,6,8,9,10,17]. This tessellation process subdivides the NURBS surfaces into polygons so that the hardware graphics accelerator, if present, may render the polygons in real-time.…”

Section: Introductionmentioning

confidence: 99%

Incremental rendering of deformable trimmed NURBS surfaces

Cheung

Lau

2003

Proceedings of the ACM Symposium on Virtual Reality Software and Technology

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Trimmed NURBS surfaces are often used to model smooth and complex objects. Unfortunately, most existing hardware graphics accelerators cannot render them directly. Although there are a lot of methods proposed to accelerate the rendering of such surfaces, majority of them are based on tessellation, which is developed primarily for handling non-deforming objects. For an object that may deform in run-time, such as clothing, facial expression, human and animal character, the tessellation process will need to be performed repeatedly while the object is deforming. However, as the tessellation process is very time consuming, interactive display of deforming objects is difficult. This explains why deformable objects are rarely used in virtual reality applications. In this paper, we present a efficient method for incremental rendering of deformable trimmed NURBS surfaces. This method can handle both trimmed surface deformation and trimming curve deformation. Experimental results show that our method performs significantly faster than the method used in OpenGL.

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“…During the tessellation process some shape information is lost. If the initial model is represented by trimmed NURBS surfaces, the tessellation process becomes more complicated and often results in artifacts along trimming contours [Guthe et al 2002]. Moreover, the tessellation of complex shape models results in a large number of triangles, which require large amount of memory and preprocessing time for building acceleration data structures.…”

Section: Introductionmentioning

confidence: 99%

Robust and numerically stable Bézier clipping method for ray tracing NURBS surfaces

Ефремов

Havran

Seidel

2005

Proceedings of the 21st Spring Conference on Computer Graphics

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Raytracing has become a popular method for generating realistic images and movies. The progress in hardware development shows that the real time raytracing on a single PC might be possible in the ongoing future. Obviously, that new generation of raytracing based applications will require more visualization precision and flexibility. Most of the modern raytracing based applications only deal with triangles as basic primitives, which brings limitations to an application and may cause visual artifacts to appear. NURBS surface representation is common for most of 3D modeling tools because of its compactness and useful geometric properties of NURBS surfaces. Using the direct raytracing NURBS surfaces, one can achieve better quality of rendered images. Although, many such approaches have already been presented, almost all of them suffer from numerical problems or do not work in some special cases. This paper presents a modified Bézier clipping method for finding ray -NURBS surface intersection points, which is fast, robust, and numerically stable.

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Fast and memory efficient view-dependent trimmed NURBS rendering

Abstract: Abstract

Cited by 11 publications

References 33 publications

Efficient rendering of deformable objects for real‐time applications

Efficient rendering of deformable objects for real‐time applications

Incremental rendering of deformable trimmed NURBS surfaces

Robust and numerically stable Bézier clipping method for ray tracing NURBS surfaces

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