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Using backdrops and overlays

A backdrop is a bitmap image of a 2D cast member, such as a vector shape or text, that remains in the background of a 3D world as a texture at all times, regardless of camera position. Because a 3D world, by default, displays direct-to-Stage, the backdrop displays direct-to-Stage along with the world. You can use Lingo to make an image object from the cast member designated as the backdrop and create the backdrop.

Similarly, an overlay is a bitmap image of a 2D cast member that also displays direct-to-Stage in a 3D world. The overlay, however, always remains in the foreground of the world.

You can use these cast member types to make image objects for use as backdrops and overlays: bitmaps, vector shapes, Flash SWF files, and text.

Once a bitmap is inserted into a 3D world as a texture, you can use Lingo to pass the value into the backdrop or overlay property of a camera. A camera can include a list of several different backdrops and overlays, and you can specify where a backdrop or overlay appears on the list. You can then use Lingo to designate when a backdrop or overlay appears in the 3D world.

This article and the accompanying sample movie, Overlays_and_backdrops.dir, illustrate how to create both a backdrop and an overlay. To download the movie, click the link at the beginning of this article.

The authoring process
Attaching the Backdrop behavior
Examining the backdrop Lingo
Attaching the Overlay behavior
Overlay Lingo in the sample movie
Creating your own backdrop or overlay
Summary

Download the Windows source file overlays_backdrop.zip (16K)
Download the Macintosh source file overlays_backdrop.sea.hqx (20K)


Stephanie Gowin

Stephanie Gowin is a senior instructional designer for Macromedia.

05/04/01

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3D, overlay, backdrop, texture, camera