CREATING A

3D SHELLS & SLICES

QUICK CHECKS

LOG INTO DESKTOP

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LOG INTO GOOGLE CLASSROOM

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OPEN AUTOCAD

DOWNLOAD TODAY’S DRAWING FILE

OPEN ENGINEERING JOURNAL

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BE READY TO CELEBRATE

HAMBO-ACHIEVEMENT

OF THE DAy!!!

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DISCUSS & PREDICT

For the next three minutes, please take some time to select one of the following discussion questions.

• Once you have chosen a question, turn to the person sitting next to you and have a brief discussion about your chosen topic.
• After the discussion, one partner will share their thoughts with the rest of the class.
• Then, the other partner will ask one specific question that they want answered about this command.

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STEPS

How would you make a ‘shell & slice’ in AutoCAD using just three-steps?

MODIFIERS

What are two modifiers we might use to modify a ‘shell & slice’ creation?

UNCERTAINTIES

What insights or clarifications do you think others might seek about the 'shell & slice' command?

CONNECTION

How does the 'shell & slice' command relate to other commands we've discussed before?

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MEASUREMENTS

What two measurements would you consider when making a ‘shell & slice’ in AutoCAD?

INTERFACE

What might the ‘shell & slice’ command look like, and where might it be located?

TERM

How would you explain to a fifth-grader what a three-dimensional ‘shell & slice’ is in autocad?

APPLICATIONS

Identify three items that can be created using the ‘shell & slice’ commands?

ART & ENGINEERING

How might artists, designers, and engineers use ‘shell & slices’ in four different ways within their designs or artworks?

OUR GOALS

TECHNICAL PROFICIENCY:

Accurately use the shell and slice commands in AutoCAD to modify 3D objects according to specified parameters.

AESTHETIC APPLICATION:

Integrate ‘shell & slices’ into their designs in a manner that complements the overall visual appeal, recognizing how three dimensional shapes can be used to enhance spatial depth and perspective..

INNOVATIVE EXPRESSION:

Experiment with the ‘shell & slice’ command to develop unique and innovative design solutions, pushing the boundaries of traditional applications & showcasing creativity.

TERM

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How would you explain to a fifth-grader what a three-dimensional ‘shell & slice’ is in autocad?

ANSWER!

Imagine you have a toy block, and you want to make the inside of it hollow like a box; in AutoCAD, the "shell" command helps you do that by scooping out the inside.

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Now, if you wanted to cut a piece off your toy block to see what's inside or to make a new shape, the "slice" command is like a magic knife that helps you do that.

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So, in AutoCAD, "shell" makes things hollow, and "slice" cuts parts off, just like scooping ice cream and cutting cake!

APPLICATIONS

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Identify three items that can be created using the ‘shell & slice’ commands?

APPLICATIONS

• Water Bottles:
• Plastic bottles are shelled to hold liquids inside while minimizing material use.
• Backpacks:
• The fabric exterior forms a protective shell for belongings inside.
• Cell Phone Cases:
• These provide a protective shell around phones to guard against drops & scratches.
• Helmets:
• Biking or skating helmets have a hard outer shell to protect the head from impacts.
• Architectural Presentations:
• Producing sectional views of architectural models, enabling clear visualization and presentation of internal structures.
• Mold Making:
• Slicing models to create molds for casting, ensuring accurate replication of the original design.

Examples of

3D SLICES

• Notebooks:
• The pages are sliced uniformly for writing.
• Cheese Slices:
• Precut for easy use in sandwiches and burgers.
• Sliced Bread:
• Pre-sliced for convenience in sandwiches and toasts.
• Craft Papers:
• Sliced into different shapes and sizes for art and craft projects.
• Deli Meats:
• Sliced thin for sandwiches or salads.
• Fruits in Lunchboxes:
• Fruits like apples are often sliced to make them easier to eat.

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ART & ENGINEERING

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How might artists, designers, and engineers use ‘shell & slices’ in four different ways within their designs or artworks?

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ART & ENGINEERING

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Sculptural Exploration

Artists could employ the 'slice' command to dissect or segment their 3D artworks, revealing layered insights or narratives within a sculpture.

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Product Design Iteration

Designers may leverage the 'shell' command to develop prototypes of containers or cases, ensuring they have the desired thickness & internal space.

Architectural Prototyping

Architects might use the 'shell' command to create hollowed-out models of buildings or rooms, enabling a more accurate representation of interior spaces.

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Structural Analysis

Engineers could use the 'slice' tool to dissect complex structures, allowing them to study and analyze specific sections or layers for stress testing or optimization.

CASE STUDIES

WWII Parabolic "Sound Mirrors”

The Cross Sectioned Meal

Chefs often present dishes in a "cross-sectioned" style, showcasing layers of ingredients like a gourmet slice of lasagna or a multi-layered cake. This not only reveals the layers and ingredients inside but also enhances the aesthetic appeal, making the food as much a visual treat as a gastronomic one.

The Sydney Opera House

The iconic sails of the Sydney Opera House, designed by Jørn Utzon, embody the principle of the shell structure. The thin, yet robust concrete shells not only serve an aesthetic purpose but also provide functional acoustic properties for world-class performances.

Before the development of radar, large concrete "sound mirrors" as an early warning system for incoming enemy aircraft. These parabolic shell structures would focus sound waves to a single point, where a listener would be stationed, amplifying the distant hum of aircraft engines and allowing for early detection.

CONNECTION

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How does the 'shell & slice' command relate to other commands we've discussed before?

CONNECTIONS

• The 'shell' and 'slice' commands in AutoCAD are tools to modify 3D objects, much like other commands that change shapes and structures.

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• For example, the 'extrude' command pulls a flat shape (like a circle) into a 3D form (like a cylinder), while 'shell' can make that cylinder hollow inside.

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• Similarly, 'slice' can cut that cylinder into two parts, just as the 'trim' command might cut overlapping lines in a 2D drawing.

MEASUREMENTS

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What two measurements would you consider when making a ‘shell & slice’ in AutoCAD?

MEASUREMENTS

BOOM!

Shell

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Remove Faces

The faces to be removed from a 3D shape after it is shelled

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Shell Offset Distance

The thickness of the shell’s wall

Slice

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Slice Plane

Set where and how you want to cut through the 3D object.

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Desired Side

Indicates which portion of the cut 3D object you wish to retain

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INTERFACE

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What might the ‘shell & slice’ command look like, and where might it be located?

SHELL COMMAND

The "SHELL" command is found in the "SOLID EDITING" panel's "3D Tool" tab.

NOTES:

• To activate the 3D Tools tab, right-click a tab name, then drag your cursor over "display tabs" & pick "3D Tools."
• Ensure your visual style is set to “Realistic”
• Adjust you view cube to an isometric view.

SLICECOMMAND

The "SLICE’ command is found in the "SOLID EDITING" panel's "3D Tool" tab.

NOTES:

• To activate the 3D Tools tab, right-click a tab name, then drag your cursor over "display tabs" & pick "3D Tools."
• Ensure your visual style is set to “Realistic”
• Adjust you view cube to an isometric view.

STEPS

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How would you make a ‘shell & slice’ in AutoCAD using just three-steps?

SLICE STEPS

SHELL STEPS

MODIFIERS

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What are two modifiers we might use to modify a ‘shell & slice’ creation?

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SLICE

MODIFIERS

Surface ‘S’

Aligns the cutting plane with a selected surface.

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Z Axis ‘Z’

Defines the cutting plane by specifying a point on the plane and another point on the Z axis (normal) of the plane.

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View ‘V’

Aligns the cutting plane parallel to the current viewport's viewing plane. Specifying a point defines the location of the cutting plane.

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3 Point ‘3’

Defines the cutting plane using three points.

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Keep Both Sides “B”

Allows you to retain and separate both parts of the sliced object.

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Planer Object ‘O’

Aligns the cutting plane with a plane that contains the selected circle, ellipse, circular or elliptical arc, 2D spline, 2D polyline, or planar 3D polyline.

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UNCERTAINTIES

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What insights or clarifications do you think others might seek about the 'shell & slice' command?

POINTS FOR CLARIFICATION

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Can I make a straw by shelling a cylinder and removing both ends?

Absolutely! You can remove as many sides as you like when you shell.

I shelled an object in the last class. Can I undo that action now?

Directly unshelling isn't available, but you can recreate the internal space and then union it with the original object.

After slicing, can I keep both parts of my object?

Yes, just apply the "Keep Both Sides" modifier, and both parts will be preserved as individual objects.

I selected the wrong side after slicing my object. How can I correct this?

Just undo your slice and choose the side you intended to keep.

I tried shelling a cylinder to make a cup, but it didn't work.

Simply undo to the step before you attempted to shell, then ensure you remove the top face of the cylinder when you try again.

QUESTIONS

SHELL

Creates a hollow, thin wall with a specified thickness.

SLICE

Creates new 3D solids and surfaces by slicing, or dividing, existing objects.

ACTIVITY

1. Open the downloaded today’s template in AutoCAD.

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• Save the template with your last name appended to the file name. For example, "Smith - 4.45-4.47 SHELL & SLICE.DWG

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• Follow the instructions for the guided walkthroughs.

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• Complete the practice exercises, experiments, and case study design challenge. Work through these tasks, using the template as needed.

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• When you have completed the tasks, review your work carefully to ensure that it is accurate and meets the requirements.

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• Share your completed work with your classmates for peer review.

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• After reviewing and incorporating any feedback from your peers, submit your completed work to Google Classroom.

MOVING FORWARD #1

For homework, gather at least five pictures of various products, artworks, or structures that showcase the principles of "shelling" and "slicing".

• Think of objects like hollowed sculptures, layered desserts, sectioned machinery, or cross-sectioned architectural models as examples.

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This assignment will deepen your grasp of the real-world applications of the shell and slice commands in 3D design and modeling.

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RECAP & REFLECT

Please take the last few minutes to review the concepts we covered today using this quizizz.

Quizizz Code:

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This will help reinforce what you learned and ensure that you have a strong understanding of the material

MOVING FORWARD #2

On the next blank sheet in your sketchbook:

• Draw two objects: one that demonstrates the principle of "shelling" (like a hollowed vessel or container) and another showcasing "slicing" (a sectioned or dissected object).
• Shade the hollowed object to emphasize its cavity or the thickness of its walls. Think about how light would play on its inner and outer surfaces.
• For the sliced object, annotate and label the sliced surfaces and show the inner details or layers that are exposed after slicing.
• Challenge: Create a composition or scene where both a shelled and sliced object interact. This could be a hollowed-out tree stump with a sliced log next to it, a layered cake next to a hollow cup, or any other creative scenario you envision.