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	<title>Deex &#187; volumétrique</title>
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	<description>Le blog de Damien BATAILLE</description>
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		<title>Lumière volumétrique sous Maya 2009.</title>
		<link>http://deex.info/wordpress2/2008/11/lumiere-volumetrique-sous-maya-2009/</link>
		<comments>http://deex.info/wordpress2/2008/11/lumiere-volumetrique-sous-maya-2009/#comments</comments>
		<pubDate>Sun, 30 Nov 2008 01:20:26 +0000</pubDate>
		<dc:creator>deex</dc:creator>
				<category><![CDATA[Non classé]]></category>
		<category><![CDATA[fog]]></category>
		<category><![CDATA[image]]></category>
		<category><![CDATA[lumière]]></category>
		<category><![CDATA[maya]]></category>
		<category><![CDATA[maya 2009]]></category>
		<category><![CDATA[parti_volume]]></category>
		<category><![CDATA[tutorial]]></category>
		<category><![CDATA[volumétrique]]></category>

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		<description><![CDATA[Petit tutorial rapide sur comment faire du fog avec un parti_volume. <a href="http://www.rutschmann.biz" title="powered by WordPress Multibox Plugin v1.3.5" target="_blank"></a> <a href="http://deex.info/wordpress2/tutorial2/lumiere-volumetrique-maya-2009/" target="_self"></a> Cliquez sur l&#8217;image pour accéder au tutorial. <a href="http://www.tumblr.com/share/link?url=http%3A%2F%2Fdeex.info%2Fwordpress2%2F2008%2F11%2Flumiere-volumetrique-sous-maya-2009%2F&#38;name=Lumi%C3%A8re+volum%C3%A9trique+sous+Maya+2009." target="_blank" class="mr_social_sharing_popup_link"></a> <a href="http://twitter.com/share?url=http%3A%2F%2Fdeex.info%2Fwordpress2%2F2008%2F11%2Flumiere-volumetrique-sous-maya-2009%2F&#38;text=Lumi%C3%A8re+volum%C3%A9trique+sous+Maya+2009.&#38;via=deex" target="_blank" class="mr_social_sharing_popup_link"></a> <a href="mailto:?subject=Lumière volumétrique sous Maya 2009.&#38;body=http://deex.info/wordpress2/2008/11/lumiere-volumetrique-sous-maya-2009/"></a>]]></description>
			<content:encoded><![CDATA[<p style="text-align: left;">Petit tutorial rapide sur comment faire du fog avec un parti_volume.</p>
<p style="text-align: center;">
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<p><a href="http://deex.info/wordpress2/tutorial2/lumiere-volumetrique-maya-2009/" target="_self"><img class="size-medium wp-image-411 aligncenter" title="2008-11-30_013835" src="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_013835-300x223.jpg"  alt="" width="300" height="223" / class="wmp" id="wmp2"></a></p>
<p style="text-align: left;">Cliquez sur l&#8217;image pour accéder au tutorial.</p>
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		</item>
		<item>
		<title>Lumière volumétrique (Maya 2009)</title>
		<link>http://deex.info/wordpress2/tutorial2/lumiere-volumetrique-maya-2009/</link>
		<comments>http://deex.info/wordpress2/tutorial2/lumiere-volumetrique-maya-2009/#comments</comments>
		<pubDate>Sun, 30 Nov 2008 01:18:19 +0000</pubDate>
		<dc:creator>deex</dc:creator>
				<category><![CDATA[Non classé]]></category>
		<category><![CDATA[animation]]></category>
		<category><![CDATA[compo]]></category>
		<category><![CDATA[compositing]]></category>
		<category><![CDATA[dynamique]]></category>
		<category><![CDATA[fog]]></category>
		<category><![CDATA[fogue]]></category>
		<category><![CDATA[lumière]]></category>
		<category><![CDATA[maya]]></category>
		<category><![CDATA[maya 2009]]></category>
		<category><![CDATA[mental]]></category>
		<category><![CDATA[mentalray]]></category>
		<category><![CDATA[particule]]></category>
		<category><![CDATA[particules]]></category>
		<category><![CDATA[parti_volume]]></category>
		<category><![CDATA[poussiere]]></category>
		<category><![CDATA[render]]></category>
		<category><![CDATA[rendu]]></category>
		<category><![CDATA[shading]]></category>
		<category><![CDATA[spec]]></category>
		<category><![CDATA[transmat]]></category>
		<category><![CDATA[tutorial]]></category>
		<category><![CDATA[volumétrique]]></category>

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		<description><![CDATA[Petit tutorial sur les lumières volumétrique sous MentalRay. Voici notre scène de base : <a href="http://www.rutschmann.biz" title="powered by WordPress Multibox Plugin v1.3.5" target="_blank"></a> <a href="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_000101.jpg"  class="wmp" id="wmp3"></a> 1) Création des planes : Commencez par créer une nurbsPlane. Sélectionnez votre caméra, puis votre plane et allez dans Animation &#8211;&#62; contrainte &#8211;&#62; Parent Contrainte. <a href="http://www.rutschmann.biz" title="powered by WordPress Multibox Plugin v1.3.5" target="_blank"></a> <a href="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_000259.jpg"  class="wmp" id="wmp4"></a> Dans le rotateX de votre plane, tapez &#171;&#160;+= 90&#8243; pour lui rajouter 90°. Puis, reculez la [...]]]></description>
			<content:encoded><![CDATA[<p style="text-align: left;">Petit tutorial sur les lumières volumétrique sous MentalRay.</p>
<p style="text-align: left;">Voici notre scène de base :</p>
<p style="text-align: center;">
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<p><a href="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_000101.jpg"  class="wmp" id="wmp25"><img class="size-medium wp-image-390 alignnone" title="2008-11-30_000101" src="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_000101-300x169.jpg" alt="" width="300" height="169" /></a></p>
<h3 style="text-align: left;"><span style="text-decoration: underline;"><span style="color: #ff0000;">1) Création des planes :</span></span></h3>
<p style="text-align: left;">Commencez par créer une nurbsPlane. Sélectionnez votre caméra, puis votre plane et allez dans Animation &#8211;&gt; contrainte &#8211;&gt; Parent Contrainte.</p>
<p style="text-align: center;">
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<p><a href="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_000259.jpg"  class="wmp" id="wmp26"><img class="aligncenter size-medium wp-image-391" title="2008-11-30_000259" src="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_000259-300x100.jpg" alt="" width="300" height="100" /></a></p>
<p style="text-align: left;">Dans le rotateX de votre plane, tapez &laquo;&nbsp;+= 90&#8243; pour lui rajouter 90°. Puis, reculez la plane pour quelle soit devant la camera.</p>
<p style="text-align: center;">
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<p><a href="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_000440.jpg"  class="wmp" id="wmp27"><img class="aligncenter size-medium wp-image-392" title="2008-11-30_000440" src="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_000440-300x202.jpg" alt="" width="300" height="202" /></a></p>
<p style="text-align: left;">Dupliquez votre plane et reculez la environ jusqu&#8217;à la profondeur maximum de votre scène.</p>
<p style="text-align: center;">
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<p><a href="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_000519.jpg"  class="wmp" id="wmp28"><img class="aligncenter size-medium wp-image-393" title="2008-11-30_000519" src="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_000519-300x202.jpg" alt="" width="300" height="202" /></a></p>
<p style="text-align: left;">Regarder depuis votre caméra et scallez la deuxième plane jusqu&#8217;à ce qu&#8217;elle prenne la surface maximum de votre vue.</p>
<p style="text-align: center;">
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<p><a href="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_000622.jpg"  class="wmp" id="wmp29"><img class="aligncenter size-medium wp-image-394" title="2008-11-30_000622" src="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_000622-300x202.jpg" alt="" width="300" height="202" /></a>
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<p><a href="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_000638.jpg"  class="wmp" id="wmp30"><img class="aligncenter size-medium wp-image-395" title="2008-11-30_000638" src="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_000638-300x202.jpg" alt="" width="300" height="202" /></a></p>
<p style="text-align: left;">Maintenant, on va attacher vos planes a votre caméra afin que quand vous bougiez votre caméra, celle ci reste toujours parallèles a votre caméra avec la même distance.</p>
<p style="text-align: left;">Sélectionnez votre caméra, plus la 1ère plane. Allez dans animation &#8212;&gt; contrainte &#8212;&gt; parent contrainte.</p>
<p style="text-align: left;">Cochez l&#8217;option : maintain offset.</p>
<p style="text-align: left;">Appliquez la contrainte.</p>
<p style="text-align: left;">Faites de même pour la seconde plane.</p>
<p style="text-align: center;">
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<p><a href="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_000747.jpg"  class="wmp" id="wmp31"><img class="aligncenter size-medium wp-image-396" title="2008-11-30_000747" src="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_000747-300x71.jpg" alt="" width="300" height="71" /></a></p>
<p style="text-align: left;">Maintenant, sélectionnez vos planes, allez dans leur shape, puis dans MentalRay, Flag, et mettez ces paramètres :</p>
<p style="text-align: center;">
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<p><a href="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_000950.jpg"  class="wmp" id="wmp32"><img class="aligncenter size-medium wp-image-397" title="2008-11-30_000950" src="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_000950-163x300.jpg" alt="" width="163" height="300" /></a></p>
<p style="text-align: left;">Allez dans leur transform, render stats :</p>
<p style="text-align: center;">
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<p><a href="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_000951.jpg"  class="wmp" id="wmp33"><img class="aligncenter size-medium wp-image-398" title="2008-11-30_000951" src="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_000951-163x300.jpg" alt="" width="163" height="300" /></a></p>
<h3 style="text-align: left;"><span style="color: #ff0000;"><span style="text-decoration: underline;">2) Création du shader :</span></span></h3>
<p style="text-align: left;">Créez un lambert. Sélectionnez son shadingGroup, allez dans MentalRay, custom Shaders.</p>
<p style="text-align: left;">Dans material Shader, mettez un Transmat.</p>
<p style="text-align: left;">Dans shadow Shader, mettez aussi un Transmat.</p>
<p style="text-align: left;">Dans Volume Shader, mettez un parti_volume.</p>
<p style="text-align: center;">
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<p><a href="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_001047.jpg"  class="wmp" id="wmp34"><img class="aligncenter size-medium wp-image-399" title="2008-11-30_001047" src="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_001047-300x189.jpg" alt="" width="300" height="189" /></a></p>
<h3 style="text-align: left;"><span style="text-decoration: underline;"><span style="color: #ff0000;">3) Modification de la lampe :</span></span></h3>
<p style="text-align: left;">Sélectionnez votre lampe, attribut Editor, mentalRay &#8211;&gt; custom Shader.</p>
<p style="text-align: left;">Cochez Suppress all Maya Shaders.</p>
<p style="text-align: left;">Dans light Shader, mettez un physical_light.</p>
<p style="text-align: center;">
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<p><a href="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_001204.jpg"  class="wmp" id="wmp35"><img class="aligncenter size-medium wp-image-400" title="2008-11-30_001204" src="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_001204-163x300.jpg" alt="" width="163" height="300" /></a></p>
<p style="text-align: left;">Réglez la couleur de votre physical light. A noter que la Value de la couleur contrôlera la puissance de votre lumière volumétrique.</p>
<p style="text-align: center;">
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<p><a href="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_001237.jpg"  class="wmp" id="wmp36"><img class="aligncenter size-medium wp-image-401" title="2008-11-30_001237" src="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_001237-300x216.jpg" alt="" width="300" height="216" /></a></p>
<h3 style="text-align: left;"><span style="text-decoration: underline;"><span style="color: #ff0000;">4) Réglage du parti_volume :</span></span></h3>
<p style="text-align: left;">Allez dans les attributs de votre parti_volume, mettez son scatter blanc.</p>
<p style="text-align: center;">
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<p><a href="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_001833.jpg"  class="wmp" id="wmp37"><img class="aligncenter size-medium wp-image-402" title="2008-11-30_001833" src="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_001833-300x216.jpg" alt="" width="300" height="216" /></a></p>
<p style="text-align: left;">Faites un rendu.</p>
<p style="text-align: center;">
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<p><a href="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_001902.jpg"  class="wmp" id="wmp38"><img class="aligncenter size-medium wp-image-403" title="2008-11-30_001902" src="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_001902-300x230.jpg" alt="" width="300" height="230" /></a></p>
<p style="text-align: left;">Normalement, vous devriez avoir ça =).</p>
<p style="text-align: left;">Comme on peut le voir, la qualité du fog n&#8217;est pas très bonne.</p>
<p style="text-align: left;">Pour améliorer cela, il suffit de baisser min step lens et le max step lens.</p>
<p style="text-align: center;">
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<p><a href="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_001921.jpg"  class="wmp" id="wmp39"><img class="aligncenter size-medium wp-image-404" title="2008-11-30_001921" src="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_001921-163x300.jpg" alt="" width="163" height="300" /></a></p>
<p style="text-align: center;">
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<p><a href="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_002010.jpg"  class="wmp" id="wmp40"><img class="aligncenter size-medium wp-image-405" title="2008-11-30_002010" src="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_002010-300x230.jpg" alt="" width="300" height="230" /></a></p>
<p style="text-align: left;">C&#8217;est mieux !</p>
<p style="text-align: left;">Maintenant, je voudrais que le rayon soit un peu moins uniforme, comme si il y avait de la poussière.</p>
<p style="text-align: left;">Pour cela, il suffit de changer le paramètre&#8230;.nonuniform ( -_- ).</p>
<p style="text-align: center;">
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<p><a href="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_003720.jpg"  class="wmp" id="wmp41"><img class="aligncenter size-medium wp-image-406" title="2008-11-30_003720" src="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_003720-300x216.jpg" alt="" width="300" height="216" /></a></p>
<p style="text-align: left;">Rendu :</p>
<p style="text-align: center;">
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<p><a href="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_003728.jpg"  class="wmp" id="wmp42"><img class="aligncenter size-medium wp-image-407" title="2008-11-30_003728" src="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_003728-300x223.jpg" alt="" width="300" height="223" /></a></p>
<p style="text-align: left;">C&#8217;est mieux ! Mais c&#8217;est lourd&#8230;</p>
<p style="text-align: left;">Bon maintenant, moi j&#8217;aimerais des petites poussières qui volent.</p>
<h3 style="text-align: left;"><span style="color: #ff0000;"><span style="text-decoration: underline;">5) Création des particles :</span></span></h3>
<p style="text-align: left;">Allez dans Dynamique, Particles, Create emitter (allez dans les options).</p>
<p style="text-align: left;">Emitter type, mettez Volume.</p>
<p style="text-align: left;">Appelez le : mini_poussière.</p>
<p style="text-align: left;">Rate : 1000</p>
<p style="text-align: left;">Volume shape : Cube.</p>
<p style="text-align: left;">Cliquez sur Create.</p>
<p style="text-align: left;">Ceci a créé un émetteur et vos particles.</p>
<p style="text-align: left;">Scallez votre émetteur mini_poussiere pour qu&#8217;il soit à la taille de votre scène.</p>
<p style="text-align: left;">Maintenant sélectionner les particles. Mettez :</p>
<p style="text-align: left;">- conserve : 0 (pour que les particules émises ne bouges pas)</p>
<p style="text-align: left;">- max count : 5000 (le nombre max de particules)</p>
<p style="text-align: left;">Appuyer sur lecture et arrêtez la lecture quand il n&#8217;y a plus de particules émises (5000 particules donc vu qu&#8217;on à mis 5000 en max count).</p>
<p style="text-align: left;">
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<p><a href="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_011137.jpg"  class="wmp" id="wmp43"><img class="aligncenter size-medium wp-image-408" title="2008-11-30_011137" src="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_011137-300x186.jpg" alt="" width="300" height="186" /></a></p>
<p style="text-align: left;">Maintenant allez dans vos particles encore une fois, puis dans Render attributs.</p>
<p style="text-align: left;">Particle render type : point</p>
<p style="text-align: left;">Cliquez sur Current Render Type.</p>
<p style="text-align: left;">Point size, mettez 1.</p>
<p style="text-align: center;">
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<p><a href="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_011157.jpg"  class="wmp" id="wmp44"><img class="aligncenter size-medium wp-image-409" title="2008-11-30_011157" src="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_011157-300x117.jpg" alt="" width="300" height="117" /></a></p>
<p style="text-align: left;">Maintenant, sélectionnez vos particles, allez dans Solvers &#8211;&gt; initial State &#8211;&gt; set for selected.</p>
<p style="text-align: left;">Cela permet de mettre vos particules en place des la frames 1.</p>
<p style="text-align: left;">Vous pouvez maintenant revenir a la frame 1.</p>
<p style="text-align: left;">Sélectionnez votre émetteur mini_poussiere, mettez son rate (paticles/seconde) à 0.</p>
<p style="text-align: left;">Sélectionnez vos particules et remettez leur &laquo;&nbsp;conserve&nbsp;&raquo; à 1.</p>
<p style="text-align: left;">Ensuite, on veut que les particules bougent légèrement. Pour cela, on va leur mettre une légère turbulence.</p>
<p style="text-align: left;">Sélectionnez vos particules puis allez dans Fields, turbulences (les options).</p>
<p style="text-align: left;">Magnitude, mettez environ 0.5. Ceci est la force de votre turbulence.</p>
<p style="text-align: left;">Maintenant, on va créer le shader des particle. Créez un lambert, dans transparency, mettez une ramp.</p>
<p style="text-align: left;">Dans le type de la ramp, mettez : Circular ramp.</p>
<p style="text-align: left;">Réglez la ramp avec 2 couleurs : noir et blanc.</p>
<p style="text-align: left;">Le but est d&#8217;avoir un cercle noir.</p>
<p style="text-align: left;">
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<p><a href="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_011623.jpg"  class="wmp" id="wmp45"><img class="aligncenter size-medium wp-image-410" title="2008-11-30_011623" src="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_011623-300x99.jpg" alt="" width="300" height="99" /></a></p>
<p style="text-align: left;">Mettez la couleur que vous voulez à vos particules. Puis allez dans special effect de votre lambert, et mettez un léger glow intensuty (genre 0.3).</p>
<p style="text-align: left;">Faites un rendu :</p>
<p style="text-align: center;">
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<p><a href="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_013835.jpg"  class="wmp" id="wmp46"><img class="aligncenter size-medium wp-image-411" title="2008-11-30_013835" src="http://deex.info/wordpress2/wp-content/uploads/2008/11/2008-11-30_013835-300x223.jpg" alt="" width="300" height="223" /></a></p>
<p style="text-align: left;">Comme vous pouvez le voir, on voit de légères poussières &laquo;&nbsp;volantes&nbsp;&raquo;.</p>
<p style="text-align: left;">Voilà.</p>
<p style="text-align: left;">Le seul problème qu&#8217;on peut avoir, c&#8217;est qu&#8217;utiliser un parti volume est très très long en rendu.</p>
<p style="text-align: left;">En production, généralement, ces genres d&#8217;effets se font directement en compositing.</p>
<p style="text-align: left;">Si vous avez des questions, n&#8217;hésitez pas.</p>
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