For example if a surface absorbs more light in the red spectrum, then that surface will not exhibit much red in the color If the surface reflects more light in the red wavelength, its color will appear to be reddish. When light hits a surface, the color the surface appears depends on the wavelengths of light absorbed and reflected by the surface. For example, a polished white marble surface is still identifiably white. Even highly polished surfaces have diffuse reflection. Diffuse reflection is what enables us to perceive color and texture, and describes the way that when light hits an object, it penetrates just below the surface of a material and is reflected, but the light is ‘diffused’ or scattered in different directions. When light hits a surface, some of the energy is absorbed, and some reflected. ![]() This illustrates the basic principle that our ability to see objects is entirely based on the principle of reflected light. Where you can see a distinct ‘beam’ of light, this is caused by light reflecting off particles in the air. You will see a patch of light where the it hits a surface, but if there is no dust or water vapor, you will not see a beam of light like a laser. If you shine a flash light in a cave, the only light you will see is reflected off surfaces. Light is actually invisible until it intersects and reflects from an object. In reality, the way you perceive a material is based on the way rays of light (the technical term is ‘photons’) hit the surface, reflect off it and travel to your eye. These configure the basic surface properties, and this article explains them in a little more detail. There are three main sliders in the dialog labelled - Diffuse, Transparency and Reflection. But there are some things that it are helpful to understand first of all. ![]() These are very straightforward to set up. Podium supports some more complex and subtle properties like reflection, refraction, bumpiness and light emission. SketchUp allows you to configure and display these basic material properties. ![]() When you start to set up your own materials, you will start in SketchUp by applying texture, color and transparency. Materials - Diffuse, Reflection, Transparency
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