Boolean operations (UNION, SUBTRACT, INTERSECT) in AutoCAD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to perform a union of two 3D solids named solid1 and solid2.

AutoCAD

result = solid1.[1](solid2)

Drag options to blanks, or click blank then click option'

Asubtract

Bunion

Ccombine

Dintersect

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtract instead of union causes removal of one solid from another.

Using intersect returns only the overlapping volume.

The union operation combines two solids into one by merging their volumes.

2fill in blank

medium

Complete the code to subtract solid2 from solid1.

AutoCAD

result = solid1.[1](solid2)

Drag options to blanks, or click blank then click option'

Aunion

Bintersect

Csubtract

Dmerge

Attempts:

3 left

💡 Hint

Common Mistakes

Using union adds volumes instead of removing.

Using intersect returns only the overlapping volume.

The subtract operation removes the volume of solid2 from solid1.

3fill in blank

hard

Fix the error in the code to get the intersection of solid1 and solid2.

AutoCAD

result = solid1.[1](solid2)

Drag options to blanks, or click blank then click option'

Aintersect

Bcombine

Cunion

Dsubtract

Attempts:

3 left

💡 Hint

Common Mistakes

Using union merges volumes instead of finding overlap.

Using subtract removes volume instead of finding overlap.

The intersect operation returns the volume common to both solids.

4fill in blank

hard

Fill both blanks to perform a union followed by subtracting solid3 from the result.

AutoCAD

temp = solid1.[1](solid2)
final_result = temp.[2](solid3)

Drag options to blanks, or click blank then click option'

Aunion

Bsubtract

Cintersect

Dcombine

Attempts:

3 left

💡 Hint

Common Mistakes

Reversing the order of operations.

Using intersect instead of union or subtract.

First, union merges solid1 and solid2. Then, subtract removes solid3 from the merged shape.

5fill in blank

hard

Fill all three blanks to create an intersection of solid1 and solid2, then subtract solid3 from it.

AutoCAD

intersected = solid1.[1](solid2)
result = intersected.[2](solid3)
print(result.[3]())

Drag options to blanks, or click blank then click option'

Aintersect

Bsubtract

Cvolume

Dunion

Attempts:

3 left

💡 Hint

Common Mistakes

Using union instead of intersect.

Forgetting to calculate volume at the end.

First, intersect finds the common volume of solid1 and solid2. Then, subtract removes solid3 from that volume. Finally, volume() calculates the volume of the resulting shape.

Practice

1. Which Boolean operation in AutoCAD combines two 3D solids into one by adding their volumes together?

easy

A. SUBTRACT

B. DIVIDE

C. INTERSECT

D. UNION

Solution

1. Step 1: Understand Boolean operations

   Boolean operations modify 3D solids by combining or removing parts.

2. Step 2: Identify the operation that adds volumes

   UNION merges two solids into one by adding their volumes together.

3. Final Answer:

   UNION -> Option D

4. Quick Check:

   Adding volumes = UNION [OK]

Hint: UNION always adds volumes together [OK]

Common Mistakes:

• Confusing SUBTRACT with UNION
• Thinking INTERSECT adds volumes
• Choosing DIVIDE which is unrelated

2. Which of the following is the correct syntax to subtract one 3D solid from another in AutoCAD?

easy

A. SUBTRACT solid2 FROM solid1

B. SUBTRACT solid1, solid2

C. SUBTRACT solid1 FROM solid2

D. SUBTRACT solid1 solid2

Solution

1. Step 1: Recall SUBTRACT command syntax

   In AutoCAD, the syntax is SUBTRACT solid2 FROM solid1 to remove solid2 from solid1.

2. Step 2: Match syntax options

   SUBTRACT solid2 FROM solid1 matches the correct syntax with 'FROM' keyword in correct order.

3. Final Answer:

   SUBTRACT solid2 FROM solid1 -> Option A

4. Quick Check:

   Correct SUBTRACT syntax uses FROM [OK]

Hint: Remember: SUBTRACT target FROM base [OK]

Common Mistakes:

• Reversing the order of solids
• Omitting the FROM keyword
• Using commas instead of spaces

3. Given two overlapping 3D solids A and B, what will the INTERSECT operation produce?

medium

A. A new solid representing the volume common to both A and B

B. A solid that is the combination of A and B volumes

C. A solid with B removed from A

D. Two separate solids unchanged

Solution

1. Step 1: Understand INTERSECT operation

   INTERSECT returns the volume shared by both solids, the overlapping part.

2. Step 2: Analyze options

   A new solid representing the volume common to both A and B correctly describes the common volume. A solid that is the combination of A and B volumes describes UNION, a solid with B removed from A describes SUBTRACT, two separate solids describes no operation.

3. Final Answer:

   A new solid representing the volume common to both A and B -> Option A

4. Quick Check:

   INTERSECT = common volume [OK]

Hint: INTERSECT keeps only overlapping parts [OK]

Common Mistakes:

• Confusing INTERSECT with UNION
• Thinking INTERSECT removes parts
• Assuming no change occurs

4. You tried to subtract solid B from solid A using SUBTRACT solid1 solid2 but got an error. What is the likely cause?

medium

A. Solids are not overlapping

B. Using UNION instead of SUBTRACT

C. Missing the FROM keyword between solids

D. Solid names are case sensitive

Solution

1. Step 1: Check SUBTRACT command syntax

   SUBTRACT requires the syntax: SUBTRACT solid2 FROM solid1. Missing FROM causes error.

2. Step 2: Analyze error cause

   Missing the FROM keyword between solids correctly identifies missing FROM keyword as the cause. Other options are unrelated to syntax error.

3. Final Answer:

   Missing the FROM keyword between solids -> Option C

4. Quick Check:

   SUBTRACT needs FROM keyword [OK]

Hint: Always include FROM in SUBTRACT command [OK]

Common Mistakes:

• Omitting FROM keyword
• Confusing command names
• Assuming case sensitivity causes error

5. You have two solids: a cube and a cylinder overlapping partially. You want to create a new solid that is the cube with the cylinder's overlapping part removed, then add a sphere on top. Which sequence of Boolean operations should you use?

hard

A. UNION cube and cylinder, then SUBTRACT sphere

B. SUBTRACT cylinder FROM cube, then UNION with sphere

C. INTERSECT cube and cylinder, then UNION with sphere

D. SUBTRACT cube FROM cylinder, then INTERSECT with sphere

Solution

1. Step 1: Remove cylinder's overlapping part from cube

   Use SUBTRACT cylinder FROM cube to cut out the cylinder's volume from the cube.

2. Step 2: Add sphere on top

   Use UNION to combine the modified cube with the sphere, creating one solid.

3. Final Answer:

   SUBTRACT cylinder FROM cube, then UNION with sphere -> Option B

4. Quick Check:

   Remove then add = SUBTRACT then UNION [OK]

Hint: Subtract first, then union to add shapes [OK]

Common Mistakes:

• Reversing SUBTRACT order
• Using INTERSECT instead of SUBTRACT
• Adding before subtracting