Tuesday, 9 March 2010

constraints in 3d animation

Constraints

A constraint in 3d animation is a type of barrior which conflicts and causes the animitor to have issues.

A typical constraint when designing a 3d model is when buying your first issue of your 3d software, and it is not registerd with your pc or mac. maybe when
"Constraints have been used for user-interfaces since the Sketchpad system [13] in 1963. Constraints
enforce hidden relations between objects as they are common in layouts or animations.
For example several kinds of 2D animations can be expressed as constraints in Amulet
[10], and there exists a constraint-based system"

http://www.st.uni-trier.de/~diehl/pubs/3ia.pdf

As their name suggests, constraints are used to limit the motions or behaviours of an object to a certain subset of all those possible. A simple example might limit the motion of object to that of rotating around a single point.

Some examples

An example animation that uses constraints and rules is shown here. It models a `pool table' and has `rules' of gravity and object interaction applied to all the objects to create the correct motion. A constraint limits the balls to motion in contact with the surface of the table until they move beyond its bounds. The constraint is then no longer valid and the rule of gravity causes the ball to fall.

Another example shows a simulation of Newton's cradle (MPEG, 33K). This has`invisible' supports for the balls to give a better view of their motion. Constraints are use to keep the balls a constant distance from the support (to model the strings) and a gravity rule is included to model the forces present when the balls are displaced from the rest position.


content taken from click here


here is another example of how Constraints are applied to a 3d object. click here content taken from youtube.com

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