Locally restricted blending of Blobtrees (original) (raw)
Related papers
The Blob Tree- Warping, Blending and Boolean Operations in Animplicit Surface Modeling System
1998
Automatic blending has characterized the major advantage of implicit surface modeling systems. Recently, the introduction of deformations based on space warping and boolean operations between primitives has increased the usefulness of such systems. We propose a further enhancement which will greatly enhance the range of models that can be easily and intuitively defined with a skeletal implicit surface system. We decribe a hierarchical method which allows arbitrary compositions of models that make use of blending, warping and boolean operations. We call this structure the BlobTree. Blending and space warping are treated in the same way as union, difference and intersection, i.e. as nodes in the BlobTree. The traversal of the BlobTree is described along with two rendering algorithms; a polygonizer and a ray tracer. We present some examples of interesting models which can be made easily using our approach that would be very difficult to represent with conventional systems.
2009
Solid models may be blended through filleting or rounding operations that typically replace the vicinity of concave or convex edges by blends that smoothly connect to the rest of the solid's boundary. Circular blends, which are popular in manufacturing, are each the subset of a canal surface that bounds the region swept by a ball of constant or varying radius as it rolls on the solid while maintaining two tangential contacts. We propose to use a second solid to control the radius variation.
A survey of blending methods that use parametric surfaces
Computer-Aided Design, 1994
The paper discusses the blending problem in geometric modelling, and it provides a comprehensive review of solutions that use parametric surfaces. A terminology and a classification are presented to help clarify the nature of blending, and the relationships between various parametric blending methods. Several geometric techniques are evaluated, highlighting concepts which the authors feel to be important. Topological issues are also discussed. In conclusion, the applicability and efficiency of parametric techniques for general blending situations are emphasized, and open questions for future research are presented. An up-to-date list of publications on blending, including parametric-surface methods and other methods, is provided as a key to the literature.
Blending of three-dimensional geometric model shapes
Indonesian Journal of Electrical Engineering and Computer Science
Three-dimensional (3D) geometric model shapes blending method can create various in-between models from two inputs of models shapes. Though, many blended shapes are implausible due to different inputs of model type, inappropriate matching-parts, improper parts-segmentation, and non-tally number of segmentation parts. are crucial and should be taken into account. The objective of this paper is to study the strengths and weaknesses of some prominent shapes blending methods and the 3D reconstruction methods. An interpolated shape blending program using the Laplacian-based contraction and Slinky-based segmentation method is developed to illustrate the critical problems arise in the shape blending process. Output results are to be compared with some prominent existing methods and one will observe the potential research direction in the blending research work
Controlled Blending of Procedural Implicit Surfaces
2008
Implicit surfaces are becoming increasingly popular for modeling geometric objects. Procedurally defined implicit surfaces, in particular surfaces built around skeletons, provide an intuitive representation for many natural objects, and objects commonly used in geometric modeling. This paper presents a number of techniques that provide good control over the shape of the implicit surface and the way different surfaces blend together. Some extensions to these techniques provide a simple and convenient representation for "soft" surfaces of revolution, randomly deformed surfaces, and other interesting shapes that would otherwise be difficult to model.