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<H3> 6.7.3 Forces </H3>
<!--docid::SEC329::-->
<P>
There are many types of forces that can be used. More are easy to add as
well. The three main types are environmental forces, N-body forces, and
simple forces.
</P><P>
Environmental forces are added to a `<SAMP>ctWorld</SAMP>' and act on all bodies in
that world, for example gravity, air resistance, etc.
</P><P>
<TABLE><tr><td> </td><td class=example><pre>ctGravityF* gf = new ctGravityF(9.81 / M_PER_WORLDUNIT);
phyz_world.add_enviro_force(gf);
</pre></td></tr></table></P><P>
N-body forces are forces that act between multiple bodies, for example springs
and planetary gravity.
</P><P>
<TABLE><tr><td> </td><td class=example><pre>ctVector3 spring_attachment_point1(0, 1, 0);
ctSpringF* sf = new ctSpringF(
rb1, spring_attachment_point1,
rb2, spring_attachment_point2);
sf->set_magnitude(200.0 / M_PER_WORLDUNIT);
// Need to add force to each body it affects.
rb1->add_force(sf);
rb2->add_force(sf);
</pre></td></tr></table></P><P>
Specify the second body as `<SAMP>NULL</SAMP>' to indicate that end is attached to
the world and is therefore immovable.
</P><P>
Simple forces would be something like a rocket engine or other kind of force
that only acts on one body.
</P><P>
<A NAME="csPhyziks Articulated Bodies"></A>
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