Reversed faces
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i wish those things were abolished!!!! whats the $&+* is the point of them anyway? anyone know?
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Ive got a feeling they play quite a big part in rendering, i not sure why though as im a bit of a 3d newb overall.
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as far as I know they enable you to determine the inner side or outer side of a shape. just imagine you have a cube. how is the computer supposed to know, what is inside and what is outside?
some years ago everyone in europe believed earth to be the centre of the world until a smart guy called Kopernikus found some convincing arguments that the sun is much more centered than our small blue planet.
two sided faces are our arguments to define the orientation of a shape. for basic SketchUp use this is not that important. but if you start rendering a scene it is essential.
if you have a glass object for example, light will change its colour depending on the distance it travels through the material
(picture by http://www.purerender.com)therefore the render engine needs to calculate the thickness of the object. and it can only do that if it is told what the inside of the object is and what the outside.
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