Download LightWave 3D 7.5 Lighting by Nicholas Boughen PDF

By Nicholas Boughen

This e-book is concentrated in any respect degrees of animators and visible results artists who desire to show international category caliber of their desktop generated (CG) lighting fixtures environments.

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Extra info for LightWave 3D 7.5 Lighting

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The rendered images below them show the corresponding result of each size difference. Nothing is changed except the size of the area light. A very small area light acts as though it were a point source. This image uses a grid size of 1 meter. 15 Chapter 1 · · · · · · · · · · · · · · · · · · · · · · · · ... This chapter has demonstrated the basic properties of light. The physicists among you will, no doubt, care to argue the physical accuracy of several points; however, this is not a physics handbook.

Apologies to physicists everywhere. For the purposes of this book and CG lighting in general, a light source is also defined as indirect sources of illumination such as diffuse or reflected light. The sky, for example, is considered a diffuse light source, although all of its light comes indirectly from the sun. Reflected light such as light from a mirror and diffuse reflected light, also known as radiosity, is considered a light source in the CG world. There is a good reason for this. Rather than create a physically accurate lighting environment in which diffuse light sources are actually diffused from the direct source, and in which reflected light is actually reflected 20, 30, or a hundred times, bouncing around the environment, we use cheats and tricks to create these effects.

So we will spend some time later on discussing how best to fake radiosity and when is the best time to use the real deal. 35 Chapter 3 · · · · · · · · · · · · · · · · · · · · · · · · A Note about Proportion and Scale These light sources have all been described according to their normal world scale, that is, as though you were the viewer standing there, looking at them. But the camera often sees things differently. What if, for example, there was a close-up of a candle? Well then, that incandescent source would not be tiny.

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