3ds Max 2012 Bible - Kelly L. Murdock [87]
Tip
The Visibility option also can be animated for making objects slowly disappear. •
The Renderable option determines whether the object is rendered. If this option isn't selected, then the rest of the options are disabled because they don't have any effect if the object isn't rendered. The Renderable option is useful if you have a complex object that takes a while to render. You can disable the renderability of the single object to quickly render the other objects in the scene.
You can use the Visible to Camera and Visible to Reflection/Refraction options to make objects invisible to the camera or to any reflections or refractions. This feature can be useful when you are test-rendering scene elements and raytraced objects.
Tip
If an object has the Visible to Camera option disabled and the Cast Shadows option enabled, then the object isn't rendered, but its shadows are. •
The Receive Shadows and Cast Shadows options control how shadows are rendered for the selected object. The Apply Atmospherics options enable or disable rendering atmospherics. Atmospheric effects can increase the rendering time by a factor of 10, in some cases.
Cross-Reference
Atmospheric and render effects are covered in Chapter 46, “Using Atmospheric and Render Effects.” •
The Render Occluded Objects option causes the rendering engine to render all objects that are hidden behind the selected object. The hidden or occluded objects can have glows or other effects applied to them that would show up if rendered.
You use the G-Buffer Object Channel value to apply Render or Video Post effects to an object. By matching the Object Channel value to an effect ID, you can make an object receive an effect. A g-buffer is a temporary bit of memory used to process an image that isn't interrupted by transferring the data to the hard disk.
Cross-Reference
The Video Post interface is covered in Chapter 49, “Compositing with Render Elements and the Video Post Interface.” •
Enabling Motion Blur
You also can set Motion Blur from within the Object Properties dialog box. The Motion Blur effect causes objects that move fast (such as the Road Runner) to be blurred (which is useful in portraying speed). The render engine accomplishes this effect by rendering multiple copies of the object or image.
Cross-Reference
More information on these blur options is in Chapter 23, “Rendering a Scene and Enabling Quicksilver.” •
The Object Properties dialog box can set two different types of Motion Blur: Object and Image. Object motion blur affects only the object and is not affected by the camera movement. Image motion blur applies the effect to the entire image and is applied after rendering.
Cross-Reference
A third type of Motion Blur is called Scene Motion Blur and is available in the Video Post interface. See Chapter 49, “Compositing with Render Elements and the Video Post Interface,” for information on using Scene Motion Blur. •
You can turn the Enabled option on and off as an animation progresses, allowing you to motion blur select sections of your animation sequence. The Multiplier value is enabled only for the Image Motion Blur type. It is used to set the length of the blur effect. The higher the Multiplier value, the longer the blurring streaks. The Motion Blur settings found in the Object Properties dialog box can be overridden by the settings in the Render Scene dialog box.
Caution
If the Motion Blur option in the Object Properties dialog box is enabled but the Motion Blur option in the Renderer panel of the Render Scene dialog box is disabled, then motion blur will not be included in the final rendered image. •
Using the Advanced Lighting and mental ray panels
The second and third panels in the Object Properties dialog box contain object settings for working with Advanced Lighting and the mental ray renderer. Using the settings in the Advanced Lighting