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Chapter 46: Using Atmospheric and Render Effects
The Image Filters section can further refine which objects to apply the glow effect to. Options include All,
Edge, Perim (Perimeter) Alpha, Perim, Brightness, and Hue. The All option applies the effect to all pixels
that are part of the source. The Edge, Perim Alpha, and Perim options apply the effect only to the edges,
perimeter of the alpha channel, or perimeter of the source. The Brightness option includes a value and an
“I” invert button. This applies the effect only to areas with a brightness greater than the specified value. The
Hue option also includes a value and a color swatch for setting the hue, which receives the effect.
The Additional Effects section lets you apply a map to the Glow Lens Effect with an Apply option and a
map button. You can also control the Radial Density function curve or add a map for the Radial Density.
Tutorial: Creating shocking electricity from a plug outlet
In addition to the light objects, lighting in a scene can be provided by self-illuminating an object and using
a Glow render effect. Self-illuminating an object is accomplished by applying a material with a Self-
Illumination value greater than 0 or a color other than black. You can create glows by using the Render
Effects dialog box or the Video Post dialog box.
Cross-Ref
For more information on applying glows using the Video Post interface, see Bonus Chapter 4 on the DVD,
“Compositing with Render Elements and the Video Post Interface.” n
Working with a faulty electrical outlet can be a shocking experience. In this tutorial, you create an electric
arc that runs from an outlet to a plug. To create the effect of electricity, you can use a renderable spline with
several vertices and apply the Noise modifier to make it dance around. You can set the light by using a self-
illuminating material and a Glow render effect.
To create an electric arc that runs between an outlet and a plug, follow these steps:
1. Open the Electricity.max file from the Chap 46 directory on the DVD.
This file includes an outlet and an electric plug. A spline runs between the outline and the plug
with a Noise modifier applied to it, which will be our electric arc.
2. Open the Material Editor by pressing the M key, and select the first sample slot. Select a yellow
Diffuse color and an equally bright yellow for the Self-Illumination color. Set the Material Effects
Channel to 1 by clicking the Material Effects ID button and holding it down until a pop-up array
of numbers appears, and then drag to the number 1 and release the mouse. Drag this new mate-
rial to the electric arc and close the Material Editor.
3. Open the Render Effects dialog box by choosing Rendering ➪ Effects. Click the Add button, select
the Lens Effects option, and click OK. Then select Lens Effects from the list, and double-click
Glow in the Lens Effects Parameters rollout. Select Glow from the list; in the Glow Element roll-
out, set the Size to 1 and the Intensity value to 50. Then open the Options panel, set the Material
ID to 1, and enable it.
Figure 46.24 shows the resulting electric arc.

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