4.39-4.41 UNION, SUBTRACT, & INTERSECT

Match the following commands with their functions

• 3D UNIONS

• Combines two or more 3D objects into one.

• INTERSECT

• Removes overlapping volume of 3D objects from another.

• SUBTRACTS

• 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 pipe system with interconnected sections.

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

• A sculpture created by merging two solids.

• A chair model developed by blending different geometrical shapes

• A tool with a grip created by removing material

• An architectural model merging several solid structures

Organize these options into the right categories

Groups:

(a) The Statue of Liberty

,

(b) George Nelson Clocks

,

(c) Petra, Jordan

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

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

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

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

• Type 'SUB' or select 'SUBTRACT' command

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

• 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

• When do I use 'intersect' command?

• Use to retain overlapping regions between objects.

• Why isn't subtraction working?

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

• Why are my objects connected?

• 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