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1<html>
2<head>
3<title>Irrlicht Engine Tutorial</title>
4<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
5</head>
6
7<body bgcolor="#FFFFFF" leftmargin="0" topmargin="0" marginwidth="0" marginheight="0">
8<br>
9<table width="95%" border="0" cellspacing="0" cellpadding="2" align="center">
10 <tr>
11 <td bgcolor="#666699" width="10"><b><a href="http://irrlicht.sourceforge.net" target="_blank"><img src="../../media/irrlichtlogo.jpg" width="88" height="31" border="0"></a></b></td>
12 <td bgcolor="#666699" width="100%">
13<div align="center">
14<div align="center"></div>
15 <div align="left"><b><font color="#FFFFFF">Tutorial 4.Movement</font></b></div>
16 </div>
17 </td>
18 </tr>
19 <tr bgcolor="#eeeeff">
20 <td height="90" colspan="2">
21 <div align="left">
22 <p>This Tutorial shows how to move and animate SceneNodes. The basic concept
23 of SceneNodeAnimators is shown as well as manual movement of nodes using
24 the keyboard.</p>
25 <p>The program which is described here will look like this:</p>
26 <p align="center"><img src="../../media/004shot.jpg" width="259" height="204"><br>
27 </p>
28 </div>
29 </td>
30 </tr>
31</table>
32<br>
33<table width="95%" border="0" cellspacing="0" cellpadding="2" align="center">
34 <tr>
35 <td bgcolor="#666699"> <div align="center"><b><font color="#FFFFFF"></font></b></div>
36 <b><font color="#FFFFFF">Lets start!</font></b></td>
37 </tr>
38 <tr>
39 <td height="90" bgcolor="#eeeeff" valign="top"> <div align="left">
40 <p>As always, I include the header files, use the irr namespace, and tell
41 the linker to link with the .lib file. </p>
42 <table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
43 <tr>
44 <td> <pre>#include &lt;stdio.h&gt;<br>#include &lt;wchar.h&gt;<br>#include &lt;irrlicht.h&gt;</pre>
45 <pre>using namespace irr;</pre>
46 <pre>#pragma comment(lib, &quot;Irrlicht.lib&quot;)</pre></td>
47 </tr>
48 </table>
49 <p>In this tutorial, one of our goals is to move a scene node using some
50 keys on the keyboard. We store a pointer to the scene node we want to
51 move with the keys here.<br>
52 The other pointer is a pointer to the Irrlicht Device, which we need
53 int the EventReceiver to manipulate the scene node and to get the active
54 camera.</p>
55 <table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
56 <tr>
57 <td> <pre>scene::ISceneNode* node = 0;<br>IrrlichtDevice* device = 0; </pre></td>
58 </tr>
59 </table>
60 <p>To get events like mouse and keyboard input, or GUI events like &quot;the
61 OK button has been clicked&quot;, we need an object wich is derived
62 from the IEventReceiver object. There is only one method to override:
63 OnEvent. This method will be called by the engine when an event happened.
64 We will use this input to move the scene node with the keys W and S.</p>
65 <table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
66 <tr>
67 <td> <pre>class MyEventReceiver : public IEventReceiver<br>{<br>public:<br> virtual bool OnEvent(const SEvent&amp; event)<br> { </pre></td>
68 </tr>
69 </table>
70 <p>If the key 'W' or 'S' was left up, we get the position of the scene
71 node, and modify the Y coordinate a little bit. So if you press 'W',
72 the node moves up, and if you press 'S' it moves down.</p>
73 <table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
74 <tr>
75 <td> <pre>if (node != 0 &amp;&amp; event.EventType == irr::EET_KEY_INPUT_EVENT&amp;&amp;<br> !event.KeyInput.PressedDown)<br>{<br> switch(event.KeyInput.Key)<br> {<br> case KEY_KEY_W:<br> case KEY_KEY_S:<br> {<br> core::vector3df v = node-&gt;getPosition();<br> v.Y += event.KeyInput.Key == KEY_KEY_W ? 2.0f : -2.0f;<br> node-&gt;setPosition(v);<br> }<br> return true;<br> }<br>} return false; <br> } <br> };</pre></td>
76 </tr>
77 </table>
78
79 </div>
80 <p>The event receiver for moving a scene node is ready. So lets just create
81 an Irrlicht Device and the scene node we want to move. We also create
82 some other additional scene nodes, to show that there are also some different
83 possibilities to move and animate scene nodes.</p>
84 <table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
85 <tr>
86 <td><pre>int main()<br>{<br> MyEventReceiver receiver;
87
88 device = createDevice(video::EDT_OPENGL, core::dimension2d&lt;s32&gt;(640, 480),
89 16, false, false, false, &amp;receiver);</pre>
90 <pre> video::IVideoDriver* driver = device-&gt;getVideoDriver();
91 scene::ISceneManager* smgr = device-&gt;getSceneManager();</pre>
92 </td>
93 </tr>
94 </table>
95 <p> Create the node for moving it with the 'W' and 'S' key. We create a
96 sphere node, which is a built in geometric primitive scene node.
97 We place the node at (0,0,30) and assign a texture to it to let it look
98 a little bit more interesting.</p>
99 <table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
100 <tr>
101 <td><pre>node = smgr-&gt;addSphereSceneNode();
102node-&gt;setPosition(core::vector3df(0,0,30));
103node-&gt;setMaterialFlag(video::EMF_LIGHTING, false);
104node-&gt;setMaterialTexture(0, driver-&gt;getTexture(&quot;../../media/wall.bmp&quot;));</pre></td>
105 </tr>
106 </table>
107 <p>Now we create another node, moving using a scene node animator. Scene
108 node animators modify scene nodes and can be attached to any scene node
109 like<br>
110 mesh scene nodes, billboards, lights and even camera scene nodes. Scene
111 node animators are not only able to modify the position of a scene node,
112 they can<br>
113 also animate the textures of an object for example. We create a test scene
114 node again an attach a 'fly circle' scene node to it, letting this node
115 fly around our first test scene node.</p>
116 <table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
117 <tr>
118 <td><pre>scene::ISceneNode* n = smgr-&gt;addCubeSceneNode();
119n-&gt;setMaterialTexture(0, driver-&gt;getTexture(&quot;../../media/t351sml.jpg&quot;));
120n-&gt;setMaterialFlag(video::EMF_LIGHTING, false);
121scene::ISceneNodeAnimator* anim =
122 smgr-&gt;createFlyCircleAnimator(core::vector3df(0,0,30), 20.0f);
123n-&gt;addAnimator(anim);
124anim-&gt;drop();</pre></td>
125 </tr>
126 </table>
127 <p>The last scene node we add to show possibilities of scene node animators
128 is a md2 model, which uses a 'fly straight' animator to run between to
129 points.</p>
130 <table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
131 <tr>
132 <td> <pre>scene::IAnimatedMeshSceneNode* anms = smgr-&gt;addAnimatedMeshSceneNode(<br> smgr-&gt;getMesh(&quot;../../media/sydney.md2&quot;));
133
134if (n)<br> {<br> anim = smgr-&gt;createFlyStraightAnimator(core::vector3df(100,0,60), <br> core::vector3df(-100,0,60), 10000, true);<br> anms-&gt;addAnimator(anim);<br> anim-&gt;drop();</pre>
135 </td>
136 </tr>
137 </table>
138 <p>To make to model look right we set the frames between which
139 the animation should loop, rotate the model around 180 degrees, and adjust
140 the animation speed and the texture.<br>
141 To set the right animation (frames and speed), we would also be able to
142 just call &quot;anms-&gt;setMD2Animation(scene::EMAT_RUN)&quot; for the
143 'run' animation instead of &quot;setFrameLoop&quot; and &quot;setAnimationSpeed&quot;,
144 but this only works with MD2 animations, and so you know how to start
145 other animations.</p>
146 <table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
147 <tr>
148 <td> <pre> anms-&gt;setMaterialFlag(video::EMF_LIGHTING, false);<br> anms-&gt;setFrameLoop(320, 360);
149 anms-&gt;setAnimationSpeed(30);<br> anms-&gt;setRotation(core::vector3df(0,180.0f,0));<br> anms-&gt;setMaterialTexture(0, driver-&gt;getTexture(&quot;../../media/sydney.bmp&quot;));<br>}<br></pre></td>
150 </tr>
151 </table>
152 <p>To be able to look at and move around in this scene, we create a first
153 person shooter style camera and make the mouse cursor invisible.</p>
154 <table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
155 <tr>
156 <td> <pre>smgr-&gt;addCameraSceneNodeFPS(0, 100.0f, 100.0f);<br>device-&gt;getCursorControl()-&gt;setVisible(false); </pre></td>
157 </tr>
158 </table>
159 <p>We have done everything, so lets draw it. We also write the current frames
160 per second and the name of the driver to the caption of the window.</p>
161 <table width="95%" border="0" cellspacing="2" cellpadding="0" bgcolor="#CCCCCC" align="center">
162 <tr>
163 <td> <pre>int lastFPS = -1;</pre>
164 <pre>while(device-&gt;run())
165{
166 driver-&gt;beginScene(true, true, video::SColor(255,90,90,156));
167 smgr-&gt;drawAll();
168 driver-&gt;endScene();</pre>
169 <pre> int fps = driver-&gt;getFPS();</pre>
170 <pre> if (lastFPS != fps)
171 {
172 wchar_t tmp[1024];
173 swprintf(tmp, 1024, L&quot;Movement Example - Irrlicht Engine (%ls)(fps:%d)&quot;,<br> driver-&gt;getName(), fps);</pre>
174 <pre> device-&gt;setWindowCaption(tmp);
175 lastFPS = fps;
176 }
177}
178
179device-&gt;drop();<br>return 0;<br>}</pre></td>
180 </tr>
181 </table>
182 <p>That's it. Compile and play around with the program. </p>
183 <p>&nbsp;</p></td>
184 </tr>
185</table>
186<p>&nbsp;</p>
187 </body>
188</html>
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