[Plib-cvs] plib/doc/sg index.html,1.13,1.14

[Steve B. <sj...@us...>]

Update of /cvsroot/plib/plib/doc/sg
In directory usw-pr-cvs1:/tmp/cvs-serv9317/plib/doc/sg

Modified Files:
	index.html 
Log Message:
Added documentation, inlined some functions.


Index: index.html
===================================================================
RCS file: /cvsroot/plib/plib/doc/sg/index.html,v
retrieving revision 1.13
retrieving revision 1.14
diff -u -d -r1.13 -r1.14
--- index.html	13 Jun 2002 05:53:02 -0000	1.13
+++ index.html	11 Aug 2002 14:48:50 -0000	1.14
@@ -870,6 +870,153 @@
   void sgSetMat4 ( sgMat4 dst, sgdMat4 src ) ;
   void sgSetCoord ( sgCoord *dst, sgdCoord *src ) ;
 </pre>
+<H3>Spring/Mass/Damper model.</H3>
+Many applications can greatly benefit from some simple dynamics
+modelling.  SG includes two classes that taken together implement
+a standard Spring-Mass-Damper model with Euler integration.
+<pre>
+
+  class sgParticle ;
+  class sgSpringDamper ;
[...122 lines suppressed...]
+accelleration due to gravity - and assume Z-is-up.  But the 'Vec3' versions
+make neither of those assumptions - so make sure the vector you give points
+DOWNWARDS!
+<p>
+eg
+<pre>
+
+    sgSetGravity ( 1.6 ) ;   /* On the Moon! */
+
+</pre>
+...but...
+<pre>
+
+    sgSetVec3 ( lunar_gravity, 0.0, 0.0, -1.6 ) ;   /* Note minus sign! */
+    sgSetGravityVec3 ( lunar_gravity ) ;
+
+</pre>
 <hr>
 <H2>Credits.</H2>
 Thanks to  <A HREF="mailto:kev...@ya...">Kevin Thompson</A>