[PDF][PDF] Direct manipulation of free-form deformations

WM Hsu, JF Hughes, H Kaufman - ACM Siggraph Computer Graphics, 1992 - dl.acm.org
WM Hsu, JF Hughes, H Kaufman
ACM Siggraph Computer Graphics, 1992dl.acm.org
Fme-form defommtion (FFD) is apowerful modeting tool, but contmtling the shape of an
object under complex deformations is often~ cult.'fhe interface to FFD in most conventional
syetems simply mpments the unddying mathematics directly, ur3ent&-acdbe deformations
by manipulating control points. lhe difEculty in controlling shape precisely is largely due to
the control pcdnte being extmneous to the objec~ the deformed object does not follow the
control pointn exactly. In addition, the number of &gmes of freedom pre@ entedto the user …
Abstract
Fme-form defommtion (FFD) is apowerful modeting tool, but contmtling the shape of an object under complex deformations is often~ cult.‘fhe interface to FFD in most conventional syetems simply mpments the unddying mathematics directly, ur3ent&-acdbe deformations by manipulating control points. lhe difEculty in controlling shape precisely is largely due to the control pcdnte being extmneous to the objec~ the deformed object does not follow the control pointn exactly. In addition, the number of &gmes of freedom pre@ entedto the user cm be ovenvhelming. We present a method that allows a uacrto control a fme-form deformation of an object by manipulating the object dhectly, leading to better contmd of the deformation and a more intuitive interface.
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