Source

BrainBugz / docs / bb_tutorial.htm

Full commit
<html>
<head>
<title>bRAINbUGZ Documentation</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>

<body bgcolor="#FFFFFF" text="#000000">
<table width="100%" border="0">
  <tr> 
    <td bgcolor="#003366"><font face="Arial, Helvetica, sans-serif" size="4" color="#FFFFFF"><a name="inst"></a>&nbsp;quickstart 
      tutorial</font></td>
  </tr>
</table>
<p>This tutorial will help to get you started with brainbugz, after you are finished, 
  you will know the basic concepts on how to create steering desires, combine 
  different steering desires and fields and how to establish a working node connection 
  setup.<br>
  It is assumed you are familar with the basic creation and setup of particle 
  systems and creation of geometry. Please consult the Maya docs if any questions 
  appear on this.</p>
  <table width="96%" border="0">
    <tr> 
      <td bgcolor="#005BB7">&nbsp;<font face="Arial, Helvetica, sans-serif" size="4" color="#FFFFFF">preparations</font></td>
    </tr>
  </table>
<p> - switch the work area from &quot;perspective&quot;- to &quot;top&quot;-view<br>
  - create a particle object &quot;bugs&quot; using the particle tool (about 60 
  -70 particle will be sufficient)<br>
  - create a polyCube &quot;terrarium&quot;, scale it so that the particles are 
  inside the cube and there is some space for them to move<br>
  - make the &quot;bugs&quot; collide with the &quot;terrarium&quot;<br>
</p>
<p>Your work area should somewhat look like this:</p>
<p><img src="images/tut_prepWorkArea.gif" width="637" height="527" border="1"></p>
  <table width="96%" border="0">
    <tr> 
      <td bgcolor="#005BB7"><font face="Arial, Helvetica, sans-serif" size="4" color="#FFFFFF"><a name="know"></a>create 
        brainbugz nodes</font></td>
    </tr>
  </table>
<p>- create 3 steering desire nodes and 1 combine desires node using the &quot;brainbugz&quot; 
  menu:</p>
<p><img src="images/tut_bbMenu.gif" width="214" height="118" border="1"> </p>
<p>- rename the steeringDesire nodes to &quot;bugsCohesion&quot;, &quot;bugsAlignment&quot;, 
  &quot;bugsSeparation&quot; <br>
  - rename the combineDesires node to &quot;bugsFlocking&quot;</p>
<p><img src="images/tut_NodeRename.gif" width="200" height="199" border="1"></p>
  <table width="96%" border="0">
    <tr> 
      <td bgcolor="#005BB7"><font face="Arial, Helvetica, sans-serif" size="4" color="#FFFFFF"><a name="know"></a>connection 
        setup </font></td>
    </tr>
  </table>
<p>- start the brainbugz &quot;Connection Editor&quot; using the brainbugz menu, 
  this will help us to do all the necessary connection work</p>
<p><img src="images/tut_ConnEdit.gif" width="585" height="432" border="1"></p>
<p>You may open the &quot;Connection Graph&quot; by clicking on the small arrow, 
  this will show you the current connections made, starting with the node selected 
  in the &quot;Select Node&quot; outliner</p>
<p>The basic rules for connection editing:<br>
  - the connection graph has got to start from a particle node, and it has got 
  to end there<br>
  - all steering desires and fields must have incoming connections from a particle 
  node<br>
  - steering desires and fields outgoing connetctions can be combined using combine 
  nodes<br>
  - combine nodes can be combined with other combine nodes</p>
<p>- connect the particle node with the steering desires (select the particle 
  node &quot;bugs&quot;, all connectable nodes for incoming and outgoing connections 
  will be displayed in the relative outliner, connect the 3 steering desires at 
  &quot;outgoing connections&quot;)</p>
<p><img src="images/tut_ConnEdit2.gif" width="568" height="669"></p>
<p>- select the &quot;bugsFlocking&quot; combine desires node and connect the 
  steering desires to it (incoming) <br>
  (image shows &quot;Connection Mode - Incoming&quot;)</p>
<p><img src="images/tut_ConnEdit3.gif" width="568" height="490"></p>
<p>- the final step in connection setup is to connect &quot;bugsFlocking&quot; 
  outgoing connection to the &quot;bugs&quot; particle node incoming connection</p>
<p><img src="images/tut_ConnEdit4.gif" width="546" height="217" border="1"></p>
<p>- close the &quot;Connection Editor&quot; as we are finished with our setup</p>
<p>So, what did we just do? We created 3 Steering Desires, that will be combined 
  to 1 higher level desire and established all connection necessary to make the 
  system work. Now we have got to set the attributes for the different steering 
  desires.</p>
  <table width="96%" border="0">
    <tr> 
      <td bgcolor="#005BB7"><font face="Arial, Helvetica, sans-serif" size="4" color="#FFFFFF"><a name="know"></a>edit 
        steering desires</font></td>
    </tr>
  </table>
<p>- select the &quot;bugsAlignment&quot; steering desire, open the Attribute 
  Editor<br>
  - set &quot;Steering Desire&quot; to &quot;Neighbor - Alignment&quot;</p>
<p><img src="images/tut_aeSD1.gif" width="401" height="345" border="1"></p>
<p>- open &quot;General Bug Attributes&quot;<br>
  - set &quot;Sensor Range&quot; to &quot;1.0&quot;<br>
  - set &quot;Senor Angle&quot; to &quot;160&quot;</p>
<p><img src="images/tut_aeSD2.gif" width="382" height="346" border="1"></p>
<p>- select &quot;bugsCohesion&quot;<br>
  - set &quot;Steering Desire&quot; to &quot;Neighbor - Cohesion&quot; <br>
  - set &quot;Sensor Range&quot; to &quot;1.8&quot;<br>
  - set &quot;Senor Angle&quot; to &quot;170&quot;</p>
<p>- select &quot;bugsSeparation&quot;<br>
  - set &quot;Steering Desire&quot; to &quot;Neighbor - Separation&quot; <br>
  - set &quot;Sensor Range&quot; to &quot;0.5&quot;<br>
  - set &quot;Senor Angle&quot; to &quot;115</p>
<p>Alignment will force the &quot;bugs&quot; to align themselves to nearby (as 
  specified by the field of view) bugs.<br>
  Cohesion will force the &quot;bugs&quot; to move in the direction of nearby 
  bugs.<br>
  Separation will prevent the &quot;bugs&quot; from crowding together with nearby 
  bugs.</p>
  <table width="96%" border="0">
    <tr> 
      <td bgcolor="#005BB7"><font face="Arial, Helvetica, sans-serif" size="4" color="#FFFFFF"><a name="know"></a>combine 
        desires</font></td>
    </tr>
  </table>
<p>Now we will combine these simple steering desires in one higher level desire 
  &quot;bugsFlocking&quot; </p>
<p>- select bbCombineDesires node &quot;bugsFlocking&quot;<br>
  - set &quot;Combine Mode&quot; to &quot;Priority&quot;<br>
  - set the priorities as shown in the image</p>
<p><img src="images/tut_aeCD1.gif" width="351" height="305" border="1"></p>
<p>Separation will have the highest priority, only if this produces no result 
  (because no nearby bugs are in the sensor range), the next desire Alignment 
  is taken into account. Only if this produces no result Cohesion will be evaluated.<br>
  Note how we set the different sensor ranges, so the higher priorized desires 
  don't overrule lower priorized desires.</p>
<p>Hit &quot;Play&quot; to start the simulation. Nothing happens - why?</p>
  <table width="96%" border="0">
    <tr> 
      <td bgcolor="#005BB7"><font face="Arial, Helvetica, sans-serif" size="4" color="#FFFFFF"><a name="know"></a>setting 
        initial particle state</font></td>
    </tr>
  </table>
<p>- switch to Component Mode<br>
  - select the particles &quot;bugs&quot;<br>
  - open the Component Editor, Load Components</p>
<p>You see, all the particles have no velocity - as the local coordinate system 
  of the particles is velocity aligned, the &quot;bugs&quot; don't know where 
  to look for nearby neighbors. So we have got to change this.</p>
<p>- set the x-component of the particles velocity to 1 (alternative you can use 
  other methods to get the particles going)</p>
<p><img src="images/tut_CompEdit.gif" width="549" height="326" border="1"></p>
<p>Note: Edit the &quot;Mass&quot; of the particles here, too.</p>
<p>- start the simulation again</p>
  <table width="96%" border="0">
    <tr> 
      <td bgcolor="#005BB7"><font face="Arial, Helvetica, sans-serif" size="4" color="#FFFFFF"><a name="know"></a>particle 
        speed clamping</font></td>
    </tr>
  </table>
<p>You'll notice some bugs will get very fast, and some will be very slow or eventually 
  stop. This can be prevented by speed clamping the particles.</p>
<p>- select particles &quot;bugs&quot;<br>
  - select &quot;Clamp Speed Particle&quot; from the brainbugz menu</p>
<p><img src="images/tut_bbMenu2.gif" width="208" height="127" border="1"></p>
<p>This will add two attributes &quot;bb Minimum Speed&quot; and &quot;bb Maximum 
  Speed&quot; as well as a runtime expression to the selected particle node which 
  will enforce min- and max speed.</p>
<p>- set &quot;bb Minimum Speed&quot; to &quot;1.0&quot;<br>
  - set &quot;bb Maximum Speed&quot; to &quot;3.5&quot;</p>
<p><img src="images/tut_aePa1.gif" width="344" height="337" border="1"></p>
<p>- start the simulation again, notice the effect</p>
<p>- experiment with different settings for the steering desires, change combination 
  mode to &quot;Weights&quot; and change the different weights</p>
  <table width="96%" border="0">
    <tr> 
      <td bgcolor="#005BB7"><font face="Arial, Helvetica, sans-serif" size="4" color="#FFFFFF"><a name="know"></a> 
        higher level desire editing</font></td>
    </tr>
  </table>
<p>Let`s make the flock move a little bit more coordinated, eg. it should move 
  along a path.</p>
<p>- create a nurbsCurve &quot;path&quot;, this will be the motion path<br>
  - create a nurbsPlane &quot;targetPlane&quot;, this will be the plane the &quot;bugs&quot; 
  will be seeking<br>
  - animate the &quot;targetPlane&quot; along the &quot;path&quot; using &quot;Attach 
  to Motion Path&quot;</p>
<p>The work area should look somewhat like this:</p>
<p><img src="images/tut_pathWorkArea.gif" width="466" height="516" border="1"></p>
<p>- create steering desire &quot;bugsPlaneArrival&quot;<br>
  - create combine desires &quot;bugsPathFollowFlocking&quot;<br>
  - set up the connections using the &quot;Connection Editor&quot; so it matches 
  the graph below</p>
<p><img src="images/tut_ConnEdit5.gif" width="619" height="238" border="1"></p>
<p>- select steering desire &quot;bugsPlaneArrival&quot;<br>
  - select steering desire &quot;Target - Arrival&quot;<br>
  - add &quot;targetPlane&quot; to the connected Geometry using the &quot;bb (Dis)Connect 
  Nodes&quot; window</p>
<p><img src="images/tut_aeSD3.gif" width="373" height="449" border="1"></p>
<p> <img src="images/tut_ConnEdit6.gif" width="366" height="180"></p>
<p>- select bbCombineDesires&quot;bugsPathFollowingFlocking&quot;<br>
  - set &quot;Combine Mode&quot; to &quot;Weights&quot;<br>
  - set the weights according to the image below</p>
<p><img src="images/tut_aeCD2.gif" width="347" height="260" border="1"></p>
<p>- start simulation<br>
  - experiment with different weights, different steering desires<br>
  - enjoy!</p>
</body>
</html>