4.39-4.41 UNION, SUBTRACT, & INTERSECT

Match the following commands with their functions

• SUBTRACTS

• Combines two or more 3D objects into one.

• 3D UNIONS

• Removes overlapping volume of 3D objects from another.

• INTERSECT

• Creates a 3D object from overlapping volume of others.

Assign these examples to the correct categories according to their commands.

Groups:

(a) Union

,

(b) Subtract

,

(c) Intersect

• A chair model developed by blending different geometrical shapes

• An architectural model merging several solid structures

• A tool with a grip created by removing material

• A pipe system with interconnected sections.

• A sculpture created by merging two solids.

• A hollow cube (imagine a box with no top)

Organize these options into the right categories

Groups:

(a) The Statue of Liberty

,

(b) George Nelson Clocks

,

(c) Petra, Jordan

• 
• 
• Petra's rock-cut architecture stunningly showcases the subtractive design method.

• Statue of Liberty unifies multiple components, exemplifying 'union' principle beautifully.

• Mid-century clocks uniquely shape via union and subtraction principles.

• 

Type ​ (a)   to use the UNION command.

Type ​ (b)   to use the SUBTRACT command.

Type ​ (c)   to use the INTERSECT command.

• IN
• SUB
• UN
• I
• S
• U

Reorder the following steps for the subtract command

• Specify the 3D solids, surfaces, or regions to subtract.

• Type 'SUB' or select 'SUBTRACT' command

• Specify the 3D solids, surfaces, or regions to keep or be modified by subtraction.

• Press enter to complete the command.

Match the following misconceptions and solutions

• Why are my objects connected?

• Use to retain overlapping regions between objects.

• Why isn't subtraction working?

• Subtract' merges; use 'separate' to disconnect.

• When do I use 'intersect' command?

• Select the object to keep first, press enter, then select the object to remove, enter again.

Name three products designed using subtract or union commands.

Name three products designed using intersect command.

How confident do you feel using the "subtract" command in AutoCAD?

• Not confident at all

• Slightly confident

• Moderately confident

• Very confident

Rate your understanding of the applications of the "intersect" command.

• Excellent understanding

• Good understanding

• Basic understanding

• No understanding