Haptic sculpting of dynamic surfaces

Abstract

Conventional free-form surface design usually require tedious control-point manipulation and/or painstaking constraint specification via unnatural mouse-based interfaces. This paper presents a novel haptic approach for the direct manipulation of physics-based B-spline surfaces. Our method permits users to interactively sculpt virtual yet real material with a standard haptic device, and feel the physically realistic presence of virtual B-spline objects with force feedback throughout the design process. We aim to develop various haptic sculpting tools to expedite the direct manipulation of B-spline surfaces with haptic feedback and constraints. One significant contribution of this paper is that point, normal, and curvature constraints can be specified interactively and modified naturally using forces. We propose and formulate a dual representation for Bspline surfaces in both physical and mathematical space. This massspring model is mathematically constrained by the B-spline surface throughout the sculpting session. The equations of motion controlling the physical behavior of the B-spline surface are solved using a tractable numerical solver in real-time. The integration of haptics with traditional geometric modeling will increase the bandwidth of human-computer interaction, and thus shorten the time-consuming design cycle. We envision that this integrated approach promises a much greater potential in computer-integrated design and manufacturing, haptic interface, interactive graphics, medical applications, and virtual environments.

Scalable molecular dynamics with NAMD

“…VMD communicates with the haptic device via a server [87] that controls the haptic environment experienced by the user, as described in [52]. The scheme of splitting the haptic, visualization, and simulation components into three communicating, asynchronous processes has been employed successfully [52,88] and permits all three components to run at top speed, maximizing the responsiveness of the system. IMD requires efficient network communication between the visualization front-end and the MD back-end.…”

Image-based non-photorealistic rendering for realtime virtual sculpting

“…Haptic rendering technologies that guide a point avatar consist of methods grounded on penalty [20] where the effect produced is in proportion with the penetration into virtual objects, and methods grounded on constraint [26,33], where the computed effect is in proportion with the shifting between the haptic interaction point (HIP) and the point of surface contact. The expansion of geometry-based methods to the haptic presentation of transformable objects has utilization in haptic sculpting [3,6] as well as CAD system [9,16]. In physics-based techniques, the computing of the interaction effects is the component of modeling based on physics.…”

“…This indicates that the spot typically remains unaltered. With the purpose of removing the spot, we alter the SFF from GS to IGS as provided by (6).…”

“…σ r is the filter scale of IFF, i.e., . We choose σ d = 3 and σ r = 20 throughout this paper, and iteratively perform the filtering process defined in (6) in the CIE-Lab color space for the x-direction, y-direction and time axis.…”

Dynamic PDE-based surface design using geometric and physical constraints

“…Ye et al [27] incorporated certain functional constraints into the design process of geometric shapes. Dachille et al [28] presented a haptic approach for the direct manipulation of physics-based B-spline surfaces. In general, physics-based techniques have various applications in visual computing areas [29][30][31][32][33][34].…”