Deussen, O.; Hamel, J.; Raab, A.; Schlechtweg, S.; Strothotte, T.: An illustration technique using hardware-based intersections and skeletons, Proc. Graphics Interface '99, pp. 175-182, 1999  Home/Search   Document Details and Download   Summary   Related Articles   Check

....this technique was the use of haloed lines [Appel79] which give an impression of depth. Different line styles such as line width, dashed or dotted lines can be employed for outline and shading [Doole90a, Doole90b] Leist94] discusses a ray tracing approach to emulate copper plates. Most recently, [Deuss99] takes advantage of the graphics hardware to achieve similar effects with sets of parallel cutting planes. In order to produce high quality illustrations from polygonal models [Winke94] uses special stroke textures in addition to the geometry, e.g. bricks of a wall. The strokes are rendered with ....

Deussen, O.; Hamel, J.; Raab, A.; Schlechtweg, S.; Strothotte, T.: An illustration technique using hardware-based intersections and skeletons, Proc. Graphics Interface '99, pp. 175-182, 1999

....Curvatures generally provide good hatch directions, but cannot be reliably or uniquely computed at many points on a surface. Our system makes use of the principle curvature directions, and uses an optimization technique to fill in the hatching field where it is poorly defined. Deussen et al. [9] use intersections of the surfaces with planes; while being quite flexible, this approach requires segmentation of the surface into parts, where different groups of planes are used; the plane orientations computed using skeletons relate only indirectly to the local surface properties. Our work ....

....lines [32, 24] Another important observation is that for cylinders the principal curvature lines are also geodesics, which is not necessarily true in general. Hatching following the principal curvature directions fails when the ratio of principal curvatures is close to one. Deussen et al. [9] uses intersections of the surface with planes to obtain hatch directions; the resulting curves are likely to be locally close to geodesics on slowly varying surfaces. Isometric parameterizations. Isoparameteric lines work well as curvature directions when a parameterization exists and is ....

Oliver Deussen, J org Harnel, Andreas Raab, Stefan Schlechtweg, and Thomas Strothotte. An Illustration Technique Using Hardware-Based Intersections. Graphics Interface '99, pages 175--182, June 1999.

....images that resemble line drawings can then be generated by applying well known image processing operators. In contrast, 9] uses a modified ray tracing algorithm for emulating engraved copper plates. With processing pixel data it is also possible to take advantage of graphics hardware: [3] generate copper plate like images from intersection lines of OpenGL clipping planes with the object. The approach that is presented in this paper examines the geometry of a model by approximating the principal directions in every vertex of the given triangle mesh. Then this data is interpolated ....

O. Deussen, J. Hamel, A. Raab, S. Schlechtweg, T. Strothotte. An illustration technique using hardware-based intersections and skeletons. Proc. Graphics Interface '99, 1999, 175--182

....shadows were introduced into the images by shadow buffers or by raising detail in shadow regions. As mentioned in Section 2 artists sometimes use crosshatching on the leaves to represent shadow. The hatching lines in this case must interact with the leaves. An intersection method as proposed in [2] can be applied here. To reduce the amount of geometric data, level of detail has to be applied to the tree models. Currently we work with some discrete representations that sometimes cause visual artifacts if representations are changed. A continuous level of detail algorithm for trees will ....

O. Deussen, J. Hamel, A. Raab, S. Schlechtweg, and T. Strothotte. An illustration technique using hardware-based intersections and skeletons. In Proceedings of Graphics Interface 99, pages 175--182. Canadian Human-Computer Communications Society, 1999.

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O. Deussen, J. Hamel, A. Raab, S. Schlechtweg, and T. Strothotte. An illustration technique using hardwarebased intersections and skeletons. In Proceedings of Graphics Interface 99, pages 175--182. Canadian Human-Computer Communications Society, 1999.

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