Bone weighting is the process of applying a weight to the bones used in model animation, such that they - and by extension any part of a model that is attached to them - actually have weight in the virtual environment. This then has the knock on effect as interfacing the physics engine with avatar animations. Movement of the arm, for example, shifts the distribution of weight in the avatar, and the physics engine, to compensate adjusts the posture. Additionally, if the system is smart enough to detect this, the shoulders will deform as the weight shifts.
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Usually, creation of a prosthetic limb errs on the lighter side, sacrificing capability for lightness. This is because until now, it has not been possible to examine the surviving bone in enough detail to safely screw a prosthetic into the bone.
One of the most important aspects when working with any skeletal system, is the joint where bones connect. If you don't get this area right, then bone will grind against prosthesis, and the bone is likely to take critical damage first. You inflame a joint, that did not have a problem in the first place, and spread further complications throughout the body.
Pennsylvania State University researcher Henry J. Donahue, Professor of Orthopaedics and Rehabilitation, Penn State College of Medicine, has found a use for the inorganic material hydroxyapatite, in covering sterilized implants so that they form a natural bond with on-site bone, fusing together over time.
The following clip from Onion News Network, is an obvious spoof - its all that onion ever produce, but at the same time, this one may cut closer to the bone than perhaps we would like.
A much more in-depth look at the concept of designing multiple implants inside the body, so you can guarantee they will always connect perfectly, as demonstrated by the prototype LayerWise jaw and its successive implants.
A Belgian German Shepard dog called Storm, has become the first person to be fitted with a prosthetic implant which fits into the bone and sticks through the skin with no risk of infection to the animal.
The parts specific to clay working are irrelevant to the virtual developer, but the general techniques and practices are invaluable if you choose to take this route, and create anatomically believable avatars. Ideal for working with weighted bone animation systems.
Industry News containing the Term Bone Weighting:
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Technique could eliminate need for bone grafts and transplants
A gene therapy that spurs the growth of tooth-supporting bone could make dental work far more pleasant.
The technique could eliminate the need to ...
Scientists are closer to understanding how to grow replacement bones with stem cell technology, thanks to research published today in the journal Nature Materials.
Many scientists are currently trying to create bone-like mate...
Stryker Corp. has announced the clinical release of a different kind of prosthetic interface, one that bears watching. Unlike traditional prosthetic-to-bone fusions, Stryker?s latest titanium mounting is pockmarked with holes and gaps, cove...
Georgia Institute of Technology bioengineers have demonstrated a way to grow tendons that gradually "fade" to bone at one end, strengthening the ends of the attachment
The technique uses a gene that triggers the fibroblast ...
Artificial bone marrow that can continuously make red and white blood cells has been created in a University of Michigan lab.
The substance grows on a 3-D scaffold that mimics the tissues supporting bone marrow in the body. ...