The tube object connects analytic spheres using cylinders and cones.
1. Select the New/Tube from the pop-up menu of the select window. This creates a level object.
2. Create the desired number of analytic spheres inside the tube object. The object hierarchy in the select window should look as in the picture below.
The spheres you dropped inside the tube level object are instantly connected with cylinders and/or cones.
A tube connects four spheres with a varying diameter
You can freely modify the position and size of spheres inside a tube object. The shape of the tube is updated instantly.
However, you should not stretch the spheres. The reason for this is that it is not possible to connect ellipsoids using cones and cylinders. If you need to create a tube with an arbitrary shape and cross-section, use NURBS or subdivision surface tools instead.
The property window can be used for selecting the desired tube type. For example, to create a closed tube:
1. Select the tube object
2. In the property window/spec tab, set Type to Closed.
This connects the first and the last spheres so that the tube becomes a closed loop.
The Star type tube connects the first sphere with the other spheres creating a star shaped tube system.
Tutorial project: 'tutorprojects\modeling\tube\star'
You can animate the shape of the tube by animating its sub objects.
For example, you can create a fancy animation by using collision detection and gravity to control the sub objects as follows:
1. Create a tube object consisting of a set of spheres.
2. Select the spheres. Then select the menu Animation/Simulations/Gravity from the menu bar.
3. Select the menu Animation/Simulations/Collision Detection.
4. Play the animation.
Tutorial project: 'tutorprojects\modeling\tube\tube through colliding spheres'