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paulbird

3DS skeletons

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hi there, any idea how (or if) skeleton/bone data is stored inside a 3DS file or where i can find that out? also, if you know where i can download some 3DS models with skeletons inside them and animation to try it out with my program? btw it is a program for 3d internet worlds so it would be good to import animated figures into it. thanx.

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Keyframing means that file stores a snapshot of the model for a number of "key" frames. In essence the transformed model vertices are stored for these keyframes.
To get a smooth animation you will interpolate vertices between two keyframes.

While it's much simpler to display animations this way, storing an animation using keyframing isn't very efficient or flexible. Sub-animations for example require the model to be split into parts (like Quake2 models) to enable separate lower- and upper parts. Skeletal animation has the advatage of just storing a set of "bones" (basically just transformation nodes) that are attached to a "skin" (or actual vertices). Animations can be stored separate from models and can also be blended (e.g. running while looking around). Unfortunately not many open formats support skeletal animations.

HTH,
Pat.

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