User Guide

26
Building Worlds
To create an object from an intersection:
1 Create and place individual objects to form an intersection.
2 Select all of the objects, and choose Object > Group.
3 Select the group.
4 In the Object Inspector palette, select the Junction option.
5 Select the Browser view to see the resulting object.
Creating openings in objects
You can create openings in objects, such as doors or windows, using subtractive objects.
You first define the volume of the opening by creating an object or a group of objects. Then
in the Tool Inspector, select the Subtractive option for the object or group. When an object
or group has the Subtractive option selected, its volume is subtracted or cut out of the
object or group it intersects.
To avoid cutting out other objects, group the subtractive object with the objects that you
want it to cut out. If you don’t group a subtractive object, it affects all other objects in the
world. For example, if you want to place a flower vase in a window opening, group the
subtractive box object with a wall object. Then, when you position the flower vase object
within the window opening defined by subtractive box, the vase is not affected because it
isn’t in the same group as the subtractive box.
To create an opening in objects:
1 Create an object to use as an opening. You can also create a group of objects to use as
an opening.
2 Select the object or group of objects.
3 In the Object Inspector palette, select the Subtractive option.
4 Select the subtractive object, along with the objects from which you want to subtract it,
and choose Object > Group.
5 Select Browser view to see the resulting object.
Note: You can’t set the Subtractive option on entry point objects and portal objects.
atmosphere.book Page 26 Wednesday, March 21, 2001 6:14 PM