4.39-4.41 UNION, SUBTRACT, & INTERSECT

Match the following commands with their functions

• SUBTRACTS

• Removes overlapping volume of 3D objects from another.

• INTERSECT

• Combines two or more 3D objects into one.

• 3D UNIONS

• 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 sculpture created by merging two solids.

• 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 hollow cube (imagine a box with no top)

• A pipe system with interconnected sections.

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

• Press enter to complete the command.

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

Match the following misconceptions and solutions

• Why are my objects connected?

• Use to retain overlapping regions between objects.

• When do I use 'intersect' command?

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

• Why isn't subtraction working?

• 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