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@@ -13,19 +13,44 @@
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<h1>[name]</h1>
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<div class="desc">
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- A standard physically-based material.<br /><br />
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-
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- A physically based micro-faceted reflectance model is used for this material - this gives a more
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- accurate and realistic looking result than the [page:MeshLambertMaterial] or [page:MeshPhongMaterial],
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- at the cost of being more computationally expensive.<br /><br />
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-
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- Shading is calculated using a [link:https://en.wikipedia.org/wiki/Phong_shading Phong] shading model.
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- This calculates shading per pixel (i.e. in the [link:https://en.wikipedia.org/wiki/Shader#Pixel_shaders pixel shader], AKA fragment shader)
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- which gives more accurate results than the Gouraud model used by [page:MeshLambertMaterial],
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- at the cost of some performance. The [page:MeshPhongMaterial] also uses this shading model.<br /><br />
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-
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- Note that for best results you should always specify a [page:.envMap environment map] when using this material.
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-
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+ A standard physically based material.<br /><br />
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+
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+ Physically based rendering (PBR) has recently become the standard in many 3D applications, such as
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+ [link:https://blogs.unity3d.com/2014/10/29/physically-based-shading-in-unity-5-a-primer/ Unity],
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+ [link:https://docs.unrealengine.com/latest/INT/Engine/Rendering/Materials/PhysicallyBased/ Unreal] and
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+ [link:http://area.autodesk.com/blogs/the-3ds-max-blog/what039s-new-for-rendering-in-3ds-max-2017 3D Studio Max].<br /><br />
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+
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+ This approach differs from older approaches in that instead of using approximations for the way in which
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+ light interacts with a surface, a physically correct model is used. The idea is that, instead of
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+ tweaking materials to look good under specific lighting, a material can be created that
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+ will react 'correctly' under all lighting scenarios.<br /><br />
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+
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+ In practice this gives a more accurate and realistic looking result than the [page:MeshLambertMaterial]
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+ or [page:MeshPhongMaterial], at the cost of being somewhat more computationally expensive.<br /><br />
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+
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+ Shading is calculated in the same way as for the [page:MeshPhongMaterial], using a
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+ [link:https://en.wikipedia.org/wiki/Phong_shading Phong] shading model. This calculates shading
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+ per pixel (i.e. in the [link:https://en.wikipedia.org/wiki/Shader#Pixel_shaders fragment shader],
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+ AKA pixel shader) which gives more accurate results than the Gouraud model used by
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+ [page:MeshLambertMaterial], at the cost of some performance.<br /><br />
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+
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+ Note that for best results you should always specify an [page:.envMap environment map] when using
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+ this material.<br /><br />
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+
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+ For a non-technical introduction to the concept of PBR and how to set up a PBR material,
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+ check out these articles by the people at [link:https://www.marmoset.co marmoset]:
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+ <ul>
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+ <li>
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+ [link:https://www.marmoset.co/posts/basic-theory-of-physically-based-rendering/ Basic Theory of Physically Based Rendering]
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+ </li>
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+ <li>
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+ [link:https://www.marmoset.co/posts/physically-based-rendering-and-you-can-too/ Physically Based Rendering and You Can Too]
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+ </li>
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+ </ul>
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+
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+ Technical details of the approach used in Three (and most other PBR systems) can be found is this
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+ [link:https://disney-animation.s3.amazonaws.com/library/s2012_pbs_disney_brdf_notes_v2.pdf paper from Disney] (pdf),
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+ by Brent Burley.
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</div>
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<iframe id="scene" src="scenes/material-browser.html#MeshStandardMaterial"></iframe>
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looeee