86 research outputs found
Intuitive Shape Modeling by Shading Design
Shading has a great impact to the human perception of 3D objects. Thus, in order to create or to deform a 3D object, it seems natural to manipulate its perceived shading. This paper presents a new solution for the software implementation of this idea. Our approach is based on the ability of a user to coarsely draw a shading, under different lighting directions. With this intuitive process, users can create or edit a height field (locally or globally), that will correspond to the drawn shading values. Moreover, we present the possibility to edit the shading intensity by means of a specular reflectance model
Coding cells of digital spaces: a framework to write generic digital topology algorithms
This paper proposes a concise coding of the cells of n-dimensional finite
regular grids. It induces a simple, generic and efficient framework for
implementing classical digital topology data structures and algorithms.
Discrete subsets of multidimensional images (e.g. regions, digital surfaces,
cubical cell complexes) have then a common and compact representation.
Moreover, algorithms have a straightforward and efficient implementation, which
is independent from the dimension or sizes of digital images. We illustrate
that point with generic hypersurface boundary extraction algorithms by scanning
or tracking. This framework has been implemented and basic operations as well
as the presented applications have been benchmarked
- …