Cinema 4D / BodyPaint 3D Program Documentation Reference Cinema 4D Cinema 4D Visualize, Broadcast, Studio
Function available in CINEMA 4D Broadcast, Studio

Dynamics

General

Filling things is no problem for Dynamics.

Tip:
Cinema 4D Broadcast contains some of the functions described below. Your software package may not include some items included below.

A brief explanation of the difference between keyframe animation and a Dynamics simulation: For a keyframe animation an animator has to plan where a collision will take place, e.g., that of two billiard balls. The animator must animate each ball separately, i.e., set keyframes. In order to make the animation look realistic, the animator will most likely have to have a real-world (video) source as reference. The animation will then be simulated as accurately as possible based on this reference animation using position and rotation tracks in the Timeline. This is a complicated and time-consuming process. However, the animator does have full control over the motion of the billiard balls.

The advantage of using Dynamics lies therein that collisions between the billiard balls must not be played out mentally or planned in advance. The billiard balls are simply given an initial velocity and let the movements take their course. Sound easy? It is. But you do partially relinquish the control you have over the movement to the Dynamics simulation, i.e., you can’t always predict the outcome.

Cinema 4D’s Dynamics simulation takes a lot of work off your hands by automatically calculating the movement of objects using realistic physical properties such as mass and velocity. These objects can be affected by force fields (e.g., (particle)modifiers), springs, motors, collisions and connectors.

Cinema 4D simulates real movement processes that occur in nature based on forces and mass.

Dynamics is designed primarily for creating complex, interactive movements such as the filling of vessels, collapsing of walls, billiard balls, etc. Objects affected by Dynamics can be organic, i.e., do not have to be hard. Soft, springy objects such as rubber balls, trampolines, waving flags, etc. can also be created (these are called "Soft Bodies").

Contrary to the first incarnation of Dynamics in Cinema 4D (prior to R12), the current version is based on a simple open source library called "Bullet". Working with Dynamics is now much simpler - you no longer have to create separate Solver objects or Gravity fields but simply have to assign a Rigid Body tag (Object Manager: Tags / Simulation Tags) to the objects you want to affect:

The most simple Dynamics scene, incl. collision: 2 objects, each with a Dynamics Body tag assigned to them.

This is all you need to make a cube fall to the floor!

The Dynamics calculation occurs very fast and works with parametric objects, i.e., you don’t have to make any Sweep or Primitives editable. The fact that a Dynamics simulation can be combined with a conventional animation (see also Dynamic Transition and Follow Position) and that the two can be mixed lets you create very interesting effects.

The Dynamics Body tag (Object Manager: Tags | Dynamics Tags | Dynamics Body) can also be assigned to an Array object or a Particle Emitter. Note that the Individual Elements option might have to be set to Top Level.

The Dynamics Body tag (Object Manager: Tags | Dynamics Tags | Dynamics Body) can be assigned to the following clone-generating objects:

All clones are dynamic objects! Note that the Individual Elements option might have to be set to Top Level OR ALL.

The Dynamics parameters can be found here:

Start state / End state

Animation frame 0 has a special meaning for Dynamics: it defines a starting state for the simulation. Therefore, as long as you are setting up the scene you should always do this at frame 0. Later, Dynamics will take control and it will no longer be possible to move Connectors or objects with Dynamic Body tags (unless Dynamic is set to Off).

Frame 0 will also be the state of rest for Soft Bodies (all Springs that define a Soft Body’s state of rest will be at their length at rest) - unless otherwise defined.

Note that the Project’s preview length should also include frame 0 because the start state will otherwise not be included.

Soft Body / Rigid Body

The difference between these two elements:

Example of Dynamics with a Cloner object

Let’s say you used the Cloner Object to create the following scene:

Initially, no gravitational force should affect the Clones. However, we want a Wind Object to blow over the constellation. At a later point we want the Clones to fall to the floor. So, how can this be done?

After the turbulent wind has started to blow …

… the gravitational effect sets in.

Commands

You have several commands from which to choose to easily modify the settings of objects with a Dynamics Body tag assigned to them (right-click on the object: Simulate tag).

Rigid Body

Adds a Dynamics Body tag with Rigid Body properties to a selected object.

Soft Body

Adds a Dynamics Body tag with Soft Body properties to a selected object.

Collider Body

Adds a Dynamics Body tag to selected objects. The object itself will then not move but can function as a collision object for other dynamic objects.

Ghost Body

Adds a Dynamics Body tag to selected objects. The Ghost object itself will then not move but other dynamic objects can analyze quasi collisions.