Liang, J.; Green, M. "Geometric Modeling Using Six Degrees of Freedom Input Devices", (1993), in Proceedings of 3 rd international Conference on CAD and Computer Graphics, August 23-26, Beijing, China,pp. 217-222.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....distributing any changes through the model to effect the least amount of local change. Nonetheless, the user may have to correct the interpretation by hand. Instead of exploiting sketch based interaction, others have approached 3D modeling by using various multi dimensional input devices. Liang [9] uses six degree of freedom input devices at a workstation to assist in directly specifying 3D parameters. Stork [13] gesturally interprets input from a Space Mouse in order to create precise solid models. Although initial results indicate that their system is effective for experienced users, it ....

Jiandong Liang and Mark Green. Geometric modeling using six degrees of freedom input devices. In Proceedings of 3rd International Conference on CAD and Computer Graphics, pages 217--222, 1993.

....user looks through the screen as if looking into a fish tank. Fish tank VR does not provide strong immersion, but is suitable for certain applications such as 3D CAD or visualization systems because of its ease of use and ability to present high quality images. For example, Liang s JDCAD system [7], which is a mechanical 3D CAD system using a 6degree of freedom (DOF) input device, employs a fish tank configuration instead of a normal VR environment. However, most fish tank VR systems still require a device to track the user s head position. Arthur et al. s system uses ADL 1, which is a ....

Jiandong Liang and Mark Green. Geometric modeling using six degrees of freedom input devices. In Proc. of the 3rd International Conference on CAD & Computer Graphics (CAD/Graphics '93), Beijing, China, 1993.

....headIPort: handIPort: realHandIPort gogoHandIPort moveHand: MoveByLocator objectIPort: posIPort: objectIPort: gogoPosOPort: posIPort: pickOPort: GoGoFilter :Select1ByTouching Fig. 3 Representation of the GoGo Technique in ITLib. Figure 5 shows a ray casting selection technique [17]. In this case, we need only the hand position and orientation as input. The hand representation and the selection ray are moved by the MoveByLocator filters. A Select1ByPointing filter selects an object from the scene and a ChangeObject filter provides the visual feedback. GoGoIT handIPort: ....

Liang, J.; Green, M. Geometric Modeling Using Six Degrees of Freedom Input Devices. Third International Conference on CAD and Computer Graphics. pp. 217 - 222. 1993

....recompiling after changes, but Alice, Avocado, and Lightning provide scripting languages to make changes at runtime (Python, Scheme, and TCL, respectively) Several interaction techniques are emerging, each one with advantages in certain conditions. For example, techniques that use spotlights [17], gaining functions for movement [21] the image plane [20] and the aperture of a cone created by a tracker [11] can compete as mechanisms for selection at a distance, while two trackers [27] two pointer input [32] or proprioception [18] can compete to support object manipulation. Several ....

Liang, J.; Green, M. Geometric Modeling Using Six Degrees of Freedom Input Devices. In the Third International Conference on CAD and Computer Graphics. 1993. pp. 217-222

....hand for low frequency) 2 3 Draw uses this natural division of manual labour by assigning the (low frequency) setting of spatial context to the left hand, and the (high frequency) selection and picking operations to the right. Jiandong Liang at University of Alberta built a system called JDCAD [20, 21] which uses a single Polhemus sensor to create 3D mechanical parts. The user creates items by selecting a primitive from a Polhemus based ring shaped menu and dragging out the bounding box. The user can then select objects, reshape them either freely or along a constrained axis, and group them ....

....this condition by disallowing edits of these vertices. 4.2 Geometry of Control Point Selection Given that the user desires a control point, this section describes how the user geometrically controls the right bat to pick the desired point. We use a probe selection technique similar to Liang s [20, 21] spotlight. A probe, represented by a narrow cylindrical shaft, is attached to the right cursor, and the user controls the position and orientation of the probe with the right bat. The distance from this probe is computed for each control point using a specialized distance metric called the probe ....

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Jiandong Liang and Mark Green. Geometric Modeling Using Six Degrees of Freedom Input Devices. In 3rd International Conference on CAD and Computer Graphics, pages 217--222, Beijing, China, August 23-26, 1993.

....data can also be shared between peers. Any MR Toolkit program may start up the peer package at any time, and may initiate and quit communications with other processes at will. Peers are connected pairwise and one peer may send a message to any or all other peers using procedures. JDCAD [9, 11] is a solid modeling and animation computer aided design system. It uses a Polhemus or Ascension 3D tracker to sweep out 3D canonical shapes such as boxes cylinders, cones and the like. These shapes can be reshaped, joined together and connected in kinematic chains. JDCAD has a 1 keyframe ....

Jiandong Liang and Mark Green. Geometric Modeling Using Six Degrees of Freedom Input Devices. Computers and Graphics, 18(4), 1994.

....an object modelling language (OML) used for programming virtual environments written by Mark Green, and a simple JDCAD to OML translator program originally written by David McLeod. Matrix and quaternion library functions were provided by Rob Lake. 3. 1 JDCAD JDCAD was developed by Jiandong Liang [6]. This CAD program uses a 6 dimensional Polhemus Isotrak device, called the bat, to create and manipulate 3D objects. JDCAD is based on a hierarchical modelling system. Complex objects are created by grouping together simpler objects. The simplest objects are primitives such as boxes, wedges, ....

Jiandong Liang and Mark Green, "Geometric Modeling Using Six Degrees of Freedom Input Devices, Proc. 3rd International Conference on CAD and Computer Graphics" Beijing, China, August 23--26, 1993, 217--222

....prevents the user from losing context awareness 2 . As a result, navigating around the hierarchy is much smoother than that of Unix s cd. As a pointing method, we use an interaction technique called the spotlight selection, which was invented by Liang as a selection method for 3D CAD systems[7]. With this method, a virtual ray is emitted from the user s hand along the orientation of the hand. When the ray hits an object, it becomes a candidate for selection. The user confirms the selection by making a select gesture. To make small or distant objects easier to select, a virtual ....

Jiandong Liang and Mark Green. Geometric modeling using six degrees of freedom input devices. In Proc. of the 3rd International Conference on CAD & Computer Graphics (CAD/Graphics '93), Beijing, China, 1993.

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Liang, J.; Green, M. "Geometric Modeling Using Six Degrees of Freedom Input Devices", (1993), in Proceedings of 3 rd international Conference on CAD and Computer Graphics, August 23-26, Beijing, China,pp. 217-222.

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