Introduction

Les Contraintes (aussi connues comme articulations) pour les corps rigides connectent deux corps rigides.

The physics constraints are meant to be attached to an Empty object. The constraint then has fields which can be pointed at the two physics-enabled object which will be bound by the constraint. The Empty object provides a location and axis for the constraint distinct from the two constrained objects. The location of the entity hosting the physics constraint marks a location and set of axes on each of the two constrained objects. These two anchor points are calculated at the beginning of the animation and their position and orientation remain fixed in the local coordinate system of the object for the duration of the animation. The objects can move far from the constraint object, but the constraint anchor moves with the object. If this feature seems limiting, consider using multiple objects with a non-physics Child of constraint and animate the relative location of the child.

Connect

The quickest way to constrain two objects is to select both and click the Connect button in Object ‣ Rigid Body. This creates a new Empty object (named « Constraint ») with a physics constraint already attached and pointing at the two selected objects.

Physics Menu

Also you can create Rigid Body Constraint on one of the two constrained objects with Rigid Body Constraint button of the Physics tab in the Properties editor. This constraint is dependent on the object location and rotation on which it was created. This way, there are no Empty object created for the constraint. The role of the Empty object is put on this object. The constrained object can be then set as Passive type for better driving the constrain.

Des paramètres supplémentaires apparaissent dans le panneau Rigid Body Constraint de l’onglet Physics dans l’éditeur Properties pour l’objet Empty sélectionné ou l’un des deux objets contraints avec la contrainte créée.

Options communes

Panneau Rigid Body Constraint.

Enabled

Spécifie si la contrainte est active pendant la simulation.

Disable Collisions

Permet aux objets contraints de passer à travers l’un l’autre.

Object 1

premier objet à contraindre.

Object 2

Second objet à contraindre.

Breakable

Permet à la contrainte de se casser pendant la simulation. Désactivé pour la contrainte Motor. Ceci peut être utile pour simuler une destruction.

Threshold

La force d’impulsion qui doit être atteinte avant la cassure de la contrainte.

Override Iterations

Allows to make constraints stronger (more iterations) or weaker (less iterations) than specified in the rigid body world.

Iterations

Number of constraint solver iterations made per simulation step for this constraint.

Limits

By using limits you can constrain objects even more by specifying a translation/rotation range on/around respectively one axis (see below for each one individually). To lock one axis, set both limits to 0.