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authorDavid Walter Seikel2014-01-13 19:47:58 +1000
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Update Irrlicht to 1.8.1. Include actual change markers this time. lol
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87 <div class="headertitle">
88<div class="title">Tutorial 8: SpecialFX </div> </div>
89</div>
90<div class="contents">
91<div class="textblock"><div class="image">
92<img src="008shot.jpg" alt="008shot.jpg"/>
93</div>
94 <p>This tutorials describes how to do special effects. It shows how to use stencil buffer shadows, the particle system, billboards, dynamic light, and the water surface scene node.</p>
95<p>We start like in some tutorials before. Please note that this time, the 'shadows' flag in <a class="el" href="namespaceirr.html#abaf4d8719cc26b0d30813abf85e47c76" title="Creates an Irrlicht device. The Irrlicht device is the root object for using the engine.">createDevice()</a> is set to true, for we want to have a dynamic shadow casted from an animated character. If this example runs too slow, set it to false. The Irrlicht Engine checks if your hardware doesn't support the stencil buffer, and disables shadows by itself, but just in case the demo runs slow on your hardware. </p>
96<div class="fragment"><pre class="fragment"><span class="preprocessor">#include &lt;<a class="code" href="irrlicht_8h.html" title="Main header file of the irrlicht, the only file needed to include.">irrlicht.h</a>&gt;</span>
97<span class="preprocessor">#include &lt;iostream&gt;</span>
98<span class="preprocessor">#include &quot;<a class="code" href="driver_choice_8h.html">driverChoice.h</a>&quot;</span>
99
100<span class="keyword">using namespace </span>irr;
101
102<span class="preprocessor">#ifdef _MSC_VER</span>
103<span class="preprocessor"></span><span class="preprocessor">#pragma comment(lib, &quot;Irrlicht.lib&quot;)</span>
104<span class="preprocessor"></span><span class="preprocessor">#endif</span>
105<span class="preprocessor"></span>
106<span class="keywordtype">int</span> main()
107{
108 <span class="comment">// ask if user would like shadows</span>
109 <span class="keywordtype">char</span> i;
110 printf(<span class="stringliteral">&quot;Please press &#39;y&#39; if you want to use realtime shadows.\n&quot;</span>);
111
112 std::cin &gt;&gt; i;
113
114 <span class="keyword">const</span> <span class="keywordtype">bool</span> shadows = (i == <span class="charliteral">&#39;y&#39;</span>);
115
116 <span class="comment">// ask user for driver</span>
117 <a class="code" href="namespaceirr_1_1video.html#ae35a6de6d436c76107ad157fe42356d0" title="An enum for all types of drivers the Irrlicht Engine supports.">video::E_DRIVER_TYPE</a> driverType=driverChoiceConsole();
118 <span class="keywordflow">if</span> (driverType==<a class="code" href="namespaceirr_1_1video.html#ae35a6de6d436c76107ad157fe42356d0ae685cada50f8c100403134d932d0414c" title="No driver, just for counting the elements.">video::EDT_COUNT</a>)
119 <span class="keywordflow">return</span> 1;
120</pre></div><p>Create device and exit if creation failed. We make the stencil flag optional to avoid slow screen modes for runs without shadows. </p>
121<div class="fragment"><pre class="fragment"> IrrlichtDevice *device =
122 <a class="code" href="namespaceirr.html#abaf4d8719cc26b0d30813abf85e47c76" title="Creates an Irrlicht device. The Irrlicht device is the root object for using the engine.">createDevice</a>(driverType, core::dimension2d&lt;u32&gt;(640, 480),
123 16, <span class="keyword">false</span>, shadows);
124
125 <span class="keywordflow">if</span> (device == 0)
126 <span class="keywordflow">return</span> 1; <span class="comment">// could not create selected driver.</span>
127
128 video::IVideoDriver* driver = device-&gt;getVideoDriver();
129 scene::ISceneManager* smgr = device-&gt;getSceneManager();
130</pre></div><p>For our environment, we load a .3ds file. It is a small room I modelled with Anim8or and exported into the 3ds format because the Irrlicht Engine does not support the .an8 format. I am a very bad 3d graphic artist, and so the texture mapping is not very nice in this model. Luckily I am a better programmer than artist, and so the Irrlicht Engine is able to create a cool texture mapping for me: Just use the mesh manipulator and create a planar texture mapping for the mesh. If you want to see the mapping I made with Anim8or, uncomment this line. I also did not figure out how to set the material right in Anim8or, it has a specular light color which I don't really like. I'll switch it off too with this code. </p>
131<div class="fragment"><pre class="fragment"> scene::IAnimatedMesh* mesh = smgr-&gt;getMesh(<span class="stringliteral">&quot;../../media/room.3ds&quot;</span>);
132
133 smgr-&gt;getMeshManipulator()-&gt;makePlanarTextureMapping(mesh-&gt;getMesh(0), 0.004f);
134
135 scene::ISceneNode* node = 0;
136
137 node = smgr-&gt;addAnimatedMeshSceneNode(mesh);
138 node-&gt;setMaterialTexture(0, driver-&gt;getTexture(<span class="stringliteral">&quot;../../media/wall.jpg&quot;</span>));
139 node-&gt;getMaterial(0).SpecularColor.set(0,0,0,0);
140</pre></div><p>Now, for the first special effect: Animated water. It works like this: The WaterSurfaceSceneNode takes a mesh as input and makes it wave like a water surface. And if we let this scene node use a nice material like the EMT_REFLECTION_2_LAYER, it looks really cool. We are doing this with the next few lines of code. As input mesh, we create a hill plane mesh, without hills. But any other mesh could be used for this, you could even use the room.3ds (which would look really strange) if you want to. </p>
141<div class="fragment"><pre class="fragment"> mesh = smgr-&gt;addHillPlaneMesh( <span class="stringliteral">&quot;myHill&quot;</span>,
142 core::dimension2d&lt;f32&gt;(20,20),
143 core::dimension2d&lt;u32&gt;(40,40), 0, 0,
144 core::dimension2d&lt;f32&gt;(0,0),
145 core::dimension2d&lt;f32&gt;(10,10));
146
147 node = smgr-&gt;addWaterSurfaceSceneNode(mesh-&gt;getMesh(0), 3.0f, 300.0f, 30.0f);
148 node-&gt;setPosition(<a class="code" href="namespaceirr_1_1core.html#a06f169d08b5c429f5575acb7edbad811" title="Typedef for a f32 3d vector.">core::vector3df</a>(0,7,0));
149
150 node-&gt;setMaterialTexture(0, driver-&gt;getTexture(<span class="stringliteral">&quot;../../media/stones.jpg&quot;</span>));
151 node-&gt;setMaterialTexture(1, driver-&gt;getTexture(<span class="stringliteral">&quot;../../media/water.jpg&quot;</span>));
152
153 node-&gt;setMaterialType(<a class="code" href="namespaceirr_1_1video.html#ac8e9b6c66f7cebabd1a6d30cbc5430f1ad8574343353ed8ade6e78bc04d64b6ae" title="A reflecting material with an optional non reflecting texture layer.">video::EMT_REFLECTION_2_LAYER</a>);
154</pre></div><p>The second special effect is very basic, I bet you saw it already in some Irrlicht Engine demos: A transparent billboard combined with a dynamic light. We simply create a light scene node, let it fly around, and to make it look more cool, we attach a billboard scene node to it. </p>
155<div class="fragment"><pre class="fragment"> <span class="comment">// create light</span>
156
157 node = smgr-&gt;addLightSceneNode(0, <a class="code" href="namespaceirr_1_1core.html#a06f169d08b5c429f5575acb7edbad811" title="Typedef for a f32 3d vector.">core::vector3df</a>(0,0,0),
158 video::SColorf(1.0f, 0.6f, 0.7f, 1.0f), 800.0f);
159 scene::ISceneNodeAnimator* anim = 0;
160 anim = smgr-&gt;createFlyCircleAnimator (<a class="code" href="namespaceirr_1_1core.html#a06f169d08b5c429f5575acb7edbad811" title="Typedef for a f32 3d vector.">core::vector3df</a>(0,150,0),250.0f);
161 node-&gt;addAnimator(anim);
162 anim-&gt;drop();
163
164 <span class="comment">// attach billboard to light</span>
165
166 node = smgr-&gt;addBillboardSceneNode(node, core::dimension2d&lt;f32&gt;(50, 50));
167 node-&gt;setMaterialFlag(<a class="code" href="namespaceirr_1_1video.html#a8a3bc00ae8137535b9fbc5f40add70d3acea597a2692b8415486a464a7f954d34" title="Will this material be lighted? Default: true.">video::EMF_LIGHTING</a>, <span class="keyword">false</span>);
168 node-&gt;setMaterialType(<a class="code" href="namespaceirr_1_1video.html#ac8e9b6c66f7cebabd1a6d30cbc5430f1a1b5a814c4466aca2943ff056003a50d1" title="A transparent material.">video::EMT_TRANSPARENT_ADD_COLOR</a>);
169 node-&gt;setMaterialTexture(0, driver-&gt;getTexture(<span class="stringliteral">&quot;../../media/particlewhite.bmp&quot;</span>));
170</pre></div><p>The next special effect is a lot more interesting: A particle system. The particle system in the Irrlicht Engine is quite modular and extensible, but yet easy to use. There is a particle system scene node into which you can put a particle emitter, which makes particles come out of nothing. These emitters are quite flexible and usually have lots of parameters like direction, amount, and color of the particles they create.</p>
171<p>There are different emitters, for example a point emitter which lets particles pop out at a fixed point. If the particle emitters available in the engine are not enough for you, you can easily create your own ones, you'll simply have to create a class derived from the IParticleEmitter interface and attach it to the particle system using setEmitter(). In this example we create a box particle emitter, which creates particles randomly inside a box. The parameters define the box, direction of the particles, minimal and maximal new particles per second, color, and minimal and maximal lifetime of the particles.</p>
172<p>Because only with emitters particle system would be a little bit boring, there are particle affectors which modify particles while they fly around. Affectors can be added to a particle system for simulating additional effects like gravity or wind. The particle affector we use in this example is an affector which modifies the color of the particles: It lets them fade out. Like the particle emitters, additional particle affectors can also be implemented by you, simply derive a class from IParticleAffector and add it with addAffector().</p>
173<p>After we set a nice material to the particle system, we have a cool looking camp fire. By adjusting material, texture, particle emitter, and affector parameters, it is also easily possible to create smoke, rain, explosions, snow, and so on. </p>
174<div class="fragment"><pre class="fragment"> <span class="comment">// create a particle system</span>
175
176 scene::IParticleSystemSceneNode* ps =
177 smgr-&gt;addParticleSystemSceneNode(<span class="keyword">false</span>);
178
179 scene::IParticleEmitter* em = ps-&gt;createBoxEmitter(
180 core::aabbox3d&lt;f32&gt;(-7,0,-7,7,1,7), <span class="comment">// emitter size</span>
181 <a class="code" href="namespaceirr_1_1core.html#a06f169d08b5c429f5575acb7edbad811" title="Typedef for a f32 3d vector.">core::vector3df</a>(0.0f,0.06f,0.0f), <span class="comment">// initial direction</span>
182 80,100, <span class="comment">// emit rate</span>
183 video::SColor(0,255,255,255), <span class="comment">// darkest color</span>
184 video::SColor(0,255,255,255), <span class="comment">// brightest color</span>
185 800,2000,0, <span class="comment">// min and max age, angle</span>
186 <a class="code" href="namespaceirr_1_1core.html#af6dc5c45ff13e7712758c827ff58676b" title="Typedef for an f32 dimension.">core::dimension2df</a>(10.f,10.f), <span class="comment">// min size</span>
187 <a class="code" href="namespaceirr_1_1core.html#af6dc5c45ff13e7712758c827ff58676b" title="Typedef for an f32 dimension.">core::dimension2df</a>(20.f,20.f)); <span class="comment">// max size</span>
188
189 ps-&gt;setEmitter(em); <span class="comment">// this grabs the emitter</span>
190 em-&gt;drop(); <span class="comment">// so we can drop it here without deleting it</span>
191
192 scene::IParticleAffector* paf = ps-&gt;createFadeOutParticleAffector();
193
194 ps-&gt;addAffector(paf); <span class="comment">// same goes for the affector</span>
195 paf-&gt;drop();
196
197 ps-&gt;setPosition(<a class="code" href="namespaceirr_1_1core.html#a06f169d08b5c429f5575acb7edbad811" title="Typedef for a f32 3d vector.">core::vector3df</a>(-70,60,40));
198 ps-&gt;setScale(<a class="code" href="namespaceirr_1_1core.html#a06f169d08b5c429f5575acb7edbad811" title="Typedef for a f32 3d vector.">core::vector3df</a>(2,2,2));
199 ps-&gt;setMaterialFlag(<a class="code" href="namespaceirr_1_1video.html#a8a3bc00ae8137535b9fbc5f40add70d3acea597a2692b8415486a464a7f954d34" title="Will this material be lighted? Default: true.">video::EMF_LIGHTING</a>, <span class="keyword">false</span>);
200 ps-&gt;setMaterialFlag(<a class="code" href="namespaceirr_1_1video.html#a8a3bc00ae8137535b9fbc5f40add70d3a4bc03b7b9dd19e577bf909313ea62510" title="May be written to the zbuffer or is it readonly. Default: true.">video::EMF_ZWRITE_ENABLE</a>, <span class="keyword">false</span>);
201 ps-&gt;setMaterialTexture(0, driver-&gt;getTexture(<span class="stringliteral">&quot;../../media/fire.bmp&quot;</span>));
202 ps-&gt;setMaterialType(<a class="code" href="namespaceirr_1_1video.html#ac8e9b6c66f7cebabd1a6d30cbc5430f1a1b5a814c4466aca2943ff056003a50d1" title="A transparent material.">video::EMT_TRANSPARENT_ADD_COLOR</a>);
203</pre></div><p>Next we add a volumetric light node, which adds a glowing fake area light to the scene. Like with the billboards and particle systems we also assign a texture for the desired effect, though this time we'll use a texture animator to create the illusion of a magical glowing area effect. </p>
204<div class="fragment"><pre class="fragment"> scene::IVolumeLightSceneNode * n = smgr-&gt;addVolumeLightSceneNode(0, -1,
205 32, <span class="comment">// Subdivisions on U axis</span>
206 32, <span class="comment">// Subdivisions on V axis</span>
207 video::SColor(0, 255, 255, 255), <span class="comment">// foot color</span>
208 video::SColor(0, 0, 0, 0)); <span class="comment">// tail color</span>
209
210 <span class="keywordflow">if</span> (n)
211 {
212 n-&gt;setScale(<a class="code" href="namespaceirr_1_1core.html#a06f169d08b5c429f5575acb7edbad811" title="Typedef for a f32 3d vector.">core::vector3df</a>(56.0f, 56.0f, 56.0f));
213 n-&gt;setPosition(<a class="code" href="namespaceirr_1_1core.html#a06f169d08b5c429f5575acb7edbad811" title="Typedef for a f32 3d vector.">core::vector3df</a>(-120,50,40));
214
215 <span class="comment">// load textures for animation</span>
216 core::array&lt;video::ITexture*&gt; textures;
217 <span class="keywordflow">for</span> (<a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> g=7; g &gt; 0; --g)
218 {
219 <a class="code" href="namespaceirr_1_1core.html#ade1071a878633f2f6d8a75c5d11fec19" title="Typedef for character strings.">core::stringc</a> tmp;
220 tmp = <span class="stringliteral">&quot;../../media/portal&quot;</span>;
221 tmp += g;
222 tmp += <span class="stringliteral">&quot;.bmp&quot;</span>;
223 video::ITexture* t = driver-&gt;getTexture( tmp.c_str() );
224 textures.push_back(t);
225 }
226
227 <span class="comment">// create texture animator</span>
228 scene::ISceneNodeAnimator* glow = smgr-&gt;createTextureAnimator(textures, 150);
229
230 <span class="comment">// add the animator</span>
231 n-&gt;addAnimator(glow);
232
233 <span class="comment">// drop the animator because it was created with a create() function</span>
234 glow-&gt;drop();
235 }
236</pre></div><p>As our last special effect, we want a dynamic shadow be casted from an animated character. For this we load a DirectX .x model and place it into our world. For creating the shadow, we simply need to call addShadowVolumeSceneNode(). The color of shadows is only adjustable globally for all shadows, by calling ISceneManager::setShadowColor(). Voila, here is our dynamic shadow.</p>
237<p>Because the character is a little bit too small for this scene, we make it bigger using setScale(). And because the character is lighted by a dynamic light, we need to normalize the normals to make the lighting on it correct. This is always necessary if the scale of a dynamic lighted model is not (1,1,1). Otherwise it would get too dark or too bright because the normals will be scaled too. </p>
238<div class="fragment"><pre class="fragment"> <span class="comment">// add animated character</span>
239
240 mesh = smgr-&gt;getMesh(<span class="stringliteral">&quot;../../media/dwarf.x&quot;</span>);
241 scene::IAnimatedMeshSceneNode* anode = 0;
242
243 anode = smgr-&gt;addAnimatedMeshSceneNode(mesh);
244 anode-&gt;setPosition(<a class="code" href="namespaceirr_1_1core.html#a06f169d08b5c429f5575acb7edbad811" title="Typedef for a f32 3d vector.">core::vector3df</a>(-50,20,-60));
245 anode-&gt;setAnimationSpeed(15);
246
247 <span class="comment">// add shadow</span>
248 anode-&gt;addShadowVolumeSceneNode();
249 smgr-&gt;setShadowColor(video::SColor(150,0,0,0));
250
251 <span class="comment">// make the model a little bit bigger and normalize its normals</span>
252 <span class="comment">// because of the scaling, for correct lighting</span>
253 anode-&gt;setScale(<a class="code" href="namespaceirr_1_1core.html#a06f169d08b5c429f5575acb7edbad811" title="Typedef for a f32 3d vector.">core::vector3df</a>(2,2,2));
254 anode-&gt;setMaterialFlag(<a class="code" href="namespaceirr_1_1video.html#a8a3bc00ae8137535b9fbc5f40add70d3a3efe2d4921909a842adfc44dacc74520" title="Normalizes normals. Default: false.">video::EMF_NORMALIZE_NORMALS</a>, <span class="keyword">true</span>);
255</pre></div><p>Finally we simply have to draw everything, that's all. </p>
256<div class="fragment"><pre class="fragment"> scene::ICameraSceneNode* camera = smgr-&gt;addCameraSceneNodeFPS();
257 camera-&gt;setPosition(<a class="code" href="namespaceirr_1_1core.html#a06f169d08b5c429f5575acb7edbad811" title="Typedef for a f32 3d vector.">core::vector3df</a>(-50,50,-150));
258 camera-&gt;setFarValue(10000.0f); <span class="comment">// this increase a shadow visible range.</span>
259
260 <span class="comment">// disable mouse cursor</span>
261 device-&gt;getCursorControl()-&gt;setVisible(<span class="keyword">false</span>);
262
263 <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> lastFPS = -1;
264
265 <span class="keywordflow">while</span>(device-&gt;run())
266 <span class="keywordflow">if</span> (device-&gt;isWindowActive())
267 {
268 driver-&gt;beginScene(<span class="keyword">true</span>, <span class="keyword">true</span>, 0);
269
270 smgr-&gt;drawAll();
271
272 driver-&gt;endScene();
273
274 <span class="keyword">const</span> <a class="code" href="namespaceirr.html#ac66849b7a6ed16e30ebede579f9b47c6" title="32 bit signed variable.">s32</a> fps = driver-&gt;getFPS();
275
276 <span class="keywordflow">if</span> (lastFPS != fps)
277 {
278 <a class="code" href="namespaceirr_1_1core.html#aef83fafbb1b36fcce44c07c9be23a7f2" title="Typedef for wide character strings.">core::stringw</a> str = L<span class="stringliteral">&quot;Irrlicht Engine - SpecialFX example [&quot;</span>;
279 str += driver-&gt;getName();
280 str += <span class="stringliteral">&quot;] FPS:&quot;</span>;
281 str += fps;
282
283 device-&gt;setWindowCaption(str.c_str());
284 lastFPS = fps;
285 }
286 }
287
288 device-&gt;drop();
289
290 <span class="keywordflow">return</span> 0;
291}
292</pre></div> </div></div>
293</div>
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