Graphics (TOG)


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ACM Transactions on Graphics (TOG), Volume 7 Issue 1, Jan. 1988

Geometric continuity, shape parameters, and geometric constructions for Catmull-Rom splines
Tony D. DeRose, Brian A. Barsky
Pages: 1-41
DOI: 10.1145/42188.42265
Catmull-Rom splines have local control, can be either approximating or interpolating, and are efficiently computable. Experience with Beta-splines has shown that it is useful to endow a spline with shape parameters, used to...

A hierarchical boundary model for solid object representation
Bianca Falcidieno, Leila De Floriani
Pages: 42-60
DOI: 10.1145/42188.46164
A new hierarchical model for solid object representation is described. This model, called a hierarchical face adjacency hypergraph (HFAH), is based on a relational description of the object boundary, called a face...

Line drawings of octree-represented objects
Narendra Ahuja, Jack Veenstra
Pages: 61-75
DOI: 10.1145/42188.42189
The octree structure represents the space occupied by an object as a juxtaposition of cubes, where the sizes and position coordinates of the cubes are integer powers of 2 and are defined by a recursive decomposition of three-dimensional space....

Charcoal sketching: returning control to the artist
J. Patrick McGee, Teresa W. Bleser, John L. Sibert
Pages: 76-81
DOI: 10.1145/42188.42230
Background: Traditional paint programs can be criticized on the grounds that they provide fewer degrees of freedom than conventional artistic media. Mouse or tablet input devices usually provide only (x, y) spatial information. Thus most paint...