Bryce: Boolean Difference

Today we will be learning how to create a "Boolean Difference" in Bryce -- basically meaning you cut one shape out of another shape.  The image below features a "cave" that was created by cutting a "symmetrical lattice" (looks like a mountain on top of an upside down mountain) out of a regular "terrain" (a mountain).  You can cut a block out of a sphere... a cone out of a pyramid, or whatever other shapes you might need. 

To begin this process:

• Place the two shapes together intersecting one another (touching)
• Select the shape you want to use as a "cutting tool" and click the "A" (Attributes) tool.
• Select the "Negative" bullet and un-check the "Transfer Materials of Negative Boolean" option.
• Click the "check mark" to okay the change.
• Select the shape you want to cut IN to (the shape you want to keep).
• Click the "A" (Attributes) button.
• Select the "Positive" bullet mark and click the check mark to okay the change.

Next you have to "Group" the objects to be joined/cut:

• Select the 1st object (i.e. the "negative" piece)
• Hold SHIFT and select the 2nd object (i.e. the "positive" piece)
• If it looks like you have other objects selected, deselect and try again.  You may have to rotate the scene a bit to make clicking easier.
• With both pieces selected, click the "G" (Group) tool. 

Now you should be able to "Render" your scence and view the cut out shape.