21CSE440T

Exam preparation

Possible questions across all units, grouped by topic and by marks (2, 5, and 10, in the SRM pattern). These are practice questions to guide revision.

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21CSE440T · Computer Animation and Simulation

Exam preparation: question bank

3 units · 24 topics

2 Marks

Define computer animation.
State what a frame is in an animation sequence.
Define frame rate and state its unit of measurement.
State the typical frame rates used for cinema film and for most video.
List the material properties and forces that act as inputs to a simulation.

5 Marks

Explain how persistence of vision allows a rapid sequence of still frames to be perceived as continuous motion, and state the approximate retention time of the eye.
Explain what simulation is and describe the roles of material properties and forces in determining the calculated motion, using a brief example.
Compare animation and simulation in terms of who defines the motion and how each technique is adjusted, giving one example of each.

10 Marks

Explain in detail how a sequence of still frames produces the illusion of continuous motion. In your answer, define frame, frame rate, and persistence of vision, discuss the frame rate thresholds used in film and video, and explain why a higher frame rate increases both smoothness and rendering cost.
Describe the 3D production pipeline from modelling to rendering and compositing. Explain the purpose of each stage, how animation and simulation fit within it, and why the pipeline is treated as sequential yet iterative.

2 Marks

Define Blender in a single sentence.
State the two meanings of the word "free" as it applies to Blender.
Name the up axis that Blender uses and the up axis that Maya uses.
List any four key characteristics of Blender.
State what a Long Term Support (LTS) release is.

5 Marks

Explain what it means to describe Blender as a "suite" rather than a single tool, and give examples of the pipeline stages it covers.
Explain the meaning of open-source software and the role of the GNU General Public License (GPL) in keeping Blender free.
Describe how Blender remains free of cost today through sponsors and open-movie projects.

10 Marks

Explain the historical events that turned Blender from a 1994 in-house studio tool into free, open-source software in 2002, and describe how the Blender Foundation and its funding model keep it free today.
Compare Blender, Maya, and 3ds Max on licence, focus, supported platforms, and up axis, and explain how a user should reason about choosing between them.

2 Marks

Define 3D rendering.
State two differences between a CPU and a GPU.
What is the difference between RAM and VRAM?
Name Blender's three render engines.
Distinguish between an overlay and shading in the viewport.

5 Marks

Explain why 3D software places heavy demands on hardware, referring to the amount of data and the repeated arithmetic involved.
Describe how the CPU, GPU, RAM, and VRAM divide and support the work of producing an image.
Compare rasterisation and ray tracing in terms of direction of work, speed, and typical result.

10 Marks

Describe Blender's three render engines (Cycles, Eevee, and Workbench), relating each to rasterisation or ray tracing, and explain with justification which engine you would choose for final film work, for a quick animation preview, and while modelling.
A studio must decide between real time and offline image production for two projects, a video game and a car advertisement. Using the concepts of rasterisation, ray tracing, and hardware demands, recommend an approach for each project and justify your reasoning.

2 Marks

Define Blender and state why it is described as a 3D creation suite.
State what LTS stands for and how long an LTS release receives bug fixes.
State the official URL from which Blender 4.5 LTS should be downloaded.
List the minimum RAM and GPU memory specified for running Blender 4.5.
Name the three objects present in the Blender default startup scene.

5 Marks

Explain the difference between Blender's regular and LTS release models, and give the main reason the course standardises on version 4.5 LTS.
Describe the procedure for installing Blender 4.5 LTS on macOS, including chip selection, copying to Applications, and clearing the first-launch security prompt.
Compare installing a point release such as 4.5.1 with upgrading to a major version such as 4.6 during a semester, stating which is safe to apply and why.

10 Marks

A computer laboratory contains restricted campus Windows PCs without administrator rights, personal Windows laptops, macOS machines on both Apple Silicon and Intel, and a few Linux systems. Recommend an appropriate installation method for each case, justify each choice against the constraint of remaining fixed on 4.5 LTS, and outline how you would verify that every machine has launched Blender correctly.
Analyse the trade-offs involved in keeping Blender up to date during a semester. Explain which updates are safe to apply, which should be avoided and why, and how the version-specific user files folder relates to preserving a stable teaching environment.

2 Marks

Define the term GUI as it applies to the Blender window.
State the three top level parts of the Blender window.
List the four regions found inside a Blender editor.
Name the keyboard shortcuts that toggle the Toolbar and the Sidebar in an editor.
State the menu path and shortcut used to quit Blender.

5 Marks

Explain how areas, editors and regions nest in the Blender interface, naming the four regions and giving one example of an editor.
Describe the contents of the Topbar, outlining what appears on its left, middle and right and naming the six global menus.
Explain what the Status Bar reports and how a user configures what it displays.

10 Marks

A new student opens Blender 4.5 LTS, makes several edits to the default scene, and then finds the interface confusing after accidentally changing settings. Explain the safe procedure to quit Blender without losing work, describe how the save on quit dialog behaves, and justify when the student should use File > New with a General template versus File > Defaults > Load Factory Settings to recover a clean working environment.
Analyse why Blender arranges its interface as non overlapping tiled areas grouped into switchable workspaces rather than as scattered floating tool windows. Discuss the benefits for predictability and for animation workflows, and apply the workspace concept to explain how a user can move from building a scene to animating it without altering the scene itself.

2 Marks

Name the three objects present in the default Blender scene.
State the function of the 3D Cursor in the viewport.
List the mouse actions used to orbit, pan, and zoom the viewport.
Name the numpad shortcuts for the front, right side, and top views.
Define orthographic projection as used in the 3D Viewport.

5 Marks

Explain how the numpad is used to obtain aligned views and to perform step-based orbit, zoom, and projection changes in the 3D Viewport.
Describe the four shading modes available in the viewport and state a typical use for each.
Compare Object Mode and Edit Mode, noting what each is used for and how the user switches between them.

10 Marks

A student is modelling on a laptop that has no numpad and only a trackpad. Explain which Preferences options should be enabled and describe, with the relevant shortcuts and menu paths, how the student would orbit around an object, switch to aligned front, side, and top views, toggle projection, and recover a lost view.
Compare perspective and orthographic projection with respect to how each represents distance and parallel lines, and explain why a modeller would choose orthographic aligned views for precise construction while a final camera render uses perspective. Support your answer with the appropriate shortcuts and a real world example.

2 Marks

State the keyboard shortcut used to toggle the Sidebar and the shortcut used to toggle the Toolbar in the 3D Viewport.
Define the term active object as used by the Blender Sidebar.
List the three default tabs of the Sidebar.
Name the four fields found in the Transform panel of the Item tab.
State the axis colour code used for gizmos in Blender.

5 Marks

Explain the difference between the Scale field and the Dimensions field in the Item tab, using the default cube as a worked example to show how the two values relate.
Describe the press, move, confirm pattern of an interactive transform using G, R and S, including how a transform is confirmed and how it is cancelled.
Explain how a G, R or S transform is constrained to an axis and how an exact numeric amount is entered, including the effect of tapping the same axis key twice.

10 Marks

A student must place a cube at Location X equal to 3 metres. Outline the complete procedure for achieving this using the Sidebar numeric fields, and separately using the G, R, S shortcut method. Justify why both methods produce the same result, and analyse the situations in which each method is preferable.
Compare the active-tool workflow driven by the Toolbar with the shortcut-driven workflow using G, R and S. Analyse the role of gizmos, the persistence of the active tool, and the practices of experienced artists, and justify a recommendation for how a beginner should progress between the two approaches.

2 Marks

Define an editor in Blender and state how it differs from an area.
State where the editor-type selector is located and what it does.
List the four category groups found in the editor-type selector menu.
Name the root of the scene hierarchy shown in the Outliner.
State the difference between the eye toggle and the camera toggle on an Outliner row.

5 Marks

Explain the difference between an object and its object data, and state why this separation makes linked duplicates possible.
Describe the four restriction toggles on an Outliner row, covering the eye, the cursor arrow, the monitor, and the camera icons.
Explain why the same object can appear more than once in the Outliner, referring to how collections group a scene.

10 Marks

A student receives a cluttered blend file in which several objects appear in the viewport but not in the final render, and some objects are selected by accident while working. Using the Outliner, explain and justify a step-by-step procedure to organise the objects into a named collection, control their viewport and render visibility, and prevent accidental selection.
Explain the structure of the scene hierarchy shown in the Outliner, describing the Scene Collection, collections, objects, and object data, and describe the Outliner header controls, covering the funnel filter, the display-mode dropdown, and the search box.

2 Marks

Define the Properties editor and state its default position in the Blender window.
Name the vertical column of icon tabs that runs along the left edge of the Properties editor.
State what the term "active object" means in the context of the object-group tabs.
Name the keyboard shortcut used to toggle the Sidebar in the 3D Viewport.
Define a data-block and give one example of a data-block that two objects can share.

5 Marks

Explain why the Properties editor is described as context-sensitive, and describe how the visible tabs differ when the active object is a mesh, a camera, or a light.
Describe how a field inside a property panel is edited, covering the number field (scrub and type), slider, checkbox, drop-down, and colour swatch, and state the roles of the Tab and Enter keys.
Explain, in terms of shared data-blocks, why the Object and its Object Data are two different data-blocks and why editing one shared mesh can change two objects at once.

10 Marks

Explain the two conceptual groups of tabs in the Properties editor. Describe the purpose of each tab in the top group (Tool, Render, Output, View Layer, Scene, World) and of each tab in the object group (Object, Modifiers, Particles, Physics, Object Constraints, Object Data, Material, Texture), and state which tabs are always present and why.
A beginner reports that the Material tab has "disappeared" for a selected camera and that a setting they expect cannot be found. Analyse the problem using the concept of context-sensitive tabs, outline a step-by-step procedure a student should follow when a setting cannot be located in the Properties editor, and compare the Properties editor with the Sidebar for adjusting an object's transform, explaining when each should be used.

2 Marks

State the menu path used to open the Preferences window in Blender 4.5 LTS.
Define the purpose of the Emulate Numpad option in the Input section.
List any four of the fourteen sections found in the Preferences window.
Name the keyboard shortcut used to save the Startup File.
State what the Lights section controls and why it is not the same as scene lighting.

5 Marks

Explain the layout of the Preferences window, including how its sections are arranged, the role of the search box, and the actions available in the bottom left menu.
Describe the procedure for enabling an add-on in Blender 4.5 LTS, and explain the difference between the Get Extensions section and the classic Add-ons list.
Compare Load Factory Preferences, Revert to Saved Preferences, and the Auto-Save Preferences toggle, stating what each one does.

10 Marks

Describe the complete procedure for adapting Blender to a laptop that has no numpad and no middle mouse button. Include the settings enabled, the mouse and keyboard behaviour that results, and the trade-off introduced in Edit Mode.
A student sets up Blender on a laptop, enables the two Input emulation options, adjusts the theme and interface scale, and enables an add-on, then wonders whether these changes will be lost when Blender closes and whether they will affect the default scene. Analyse the situation by distinguishing preferences from the Startup File, explaining how auto-save behaves, and outlining what the student must do to make a custom default scene persist across every new file.

2 Marks

Define an overlay in the Blender 3D Viewport.
State the keyboard shortcut that toggles all overlays on or off.
Name the two keys used to delete a selected object and state how they differ.
State the colours Blender assigns to the X, Y, and Z axes.
State the shortcut for Apply Transform and name what it bakes into the mesh.

5 Marks

Explain the difference between overlays and what the render engine produces, giving two examples of overlay settings.
Describe the procedure for transforming an object precisely using a transform key, an axis constraint, and numeric input, then confirming the operation.
Compare a duplicate made with Shift D and a linked duplicate made with Alt D, noting how each behaves when the mesh is edited and a typical use for each.

10 Marks

A student reports that part of a model appears red in the viewport and that a newly added cube spawned in an unexpected location. Using your knowledge of Face Orientation, the 3D cursor, and the Adjust Last Operation panel, diagnose both problems and outline the steps to resolve them.
Two objects must be rotated in a scene, once as a single group and once so that each object turns about its own centre. Explain how the Pivot Point setting and the 3D cursor affect the result, justify a suitable pivot choice for each case, and distinguish the magnet snapping tool from the Shift S cursor snap menu.

2 Marks

Define an area in the context of the Blender interface.
State the function of the Editor Type button and where it is located.
Name the keyboard shortcut used to maximise the area under the cursor.
List two ways to split one area into two.
State what happens to the scene data when an area is switched to a different editor.

5 Marks

Explain the difference between resizing an area and splitting an area, including the cursor cue and the mouse action used for each.
Describe the procedure for joining two neighbouring areas, including how the dark overlay indicates which area is absorbed and how the operation can be cancelled.
Compare the maximise operation and the fullscreen operation, noting the shortcut each uses and the interface elements each one hides or preserves.

10 Marks

Explain the procedures for resizing, splitting, and joining areas in Blender 4.5, describing for each the cursor cues, the mouse actions, the menu options involved, and why every one of these operations is reversible and safe for the scene file.
A student needs to compare two versions of a model side by side and then return to a single large viewport. Apply the area operations covered in this topic to describe, step by step, how the student would build a two viewport layout and later restore a single viewport, and justify why each step is reversible.

2 Marks

Define a workspace in Blender.
State where the workspace tabs are located on the Topbar.
List the four editors present in the default Layout workspace.
Name the keyboard shortcuts used to switch to the previous and next workspace.
State what is removed when a workspace is deleted.

5 Marks

Explain the task each of the Modeling, Shading and Animation workspaces is prepared for, naming the main editor set up by each.
Describe the procedure for adding a new workspace from a template, including the button used and the kinds of templates offered.
Compare a workspace and a scene, stating what each one stores and the effect of deleting each.

10 Marks

A student worries that switching workspace tabs or deleting a workspace might damage their model or animation. Explain why these actions are safe, and analyse the distinction between what a workspace stores and what belongs to the shared scene, using an example to support your reasoning.
Describe in detail the procedures for renaming, duplicating, reordering and deleting a workspace, and apply the concept of per-workspace settings to a scenario in which a modeller moves between the Modeling and Sculpting tabs, explaining how the remembered Mode setting behaves and where these settings are configured.

2 Marks

Define a scene in Blender 4.5 LTS and state what it contains.
State where the Scene data-block selector is located in the Topbar.
List the four options offered by the New button on the Scene selector.
Name the button used to delete the active scene and state which scene it removes.
State one difference between a scene and a view layer.

5 Marks

Explain the four New options, New, Copy Settings, Linked Copy and Full Copy, describing for each what data is shared or duplicated.
Describe the procedure to create, switch between and delete scenes using the Topbar Scene data-block selector, noting how the viewport and Outliner respond.
Compare Linked Copy and Full Copy in terms of edit synchronisation and memory use.

10 Marks

A studio must frame the same set from several cameras and, separately, produce a freely modified variant of that set within one Blender file. Apply the scene creation options to this scenario, justify which option suits each requirement, and explain the consequences of choosing the wrong option.
Analyse how the choice between Linked Copy and Full Copy affects the synchronisation of edits and the memory footprint of a file, and justify a recommended workflow for isolating a heavy physics simulation in its own scene.

2 Marks

Define a .blend file and state what it stores.
Define a data-block and give two examples.
State the difference between a relative path and an absolute path in Blender.
Name the prefix that Blender uses to begin a relative path and state what it refers to.
State the purpose of a .blend1 file and name the setting that controls how many such backups are kept.

5 Marks

Explain how a .blend file acts as a container of data-blocks, and describe how data-blocks referencing one another allows a small file to describe a large scene.
Describe the procedure for creating a project folder both on disk and inside the Blender File Browser, and state the naming conventions that keep such a folder portable.
Compare relative and absolute paths for referencing external files, and explain why relative paths are preferred for portable coursework.

10 Marks

A student prepares a project on a laboratory computer using image textures and must copy the entire project to a submission drive without breaking any links. Apply the concepts of relative paths, project folder organisation and the .blend1 backup to describe a complete workflow that guarantees the textures still load after the copy, and explain how the student could recover an earlier version if the final save were corrupted.
Explain why a tidy project folder matters for an animation scene. In your answer identify the resources a scene references outside the .blend file, describe the failure that occurs when a referenced file is moved, and outline how the .blend1 backup mechanism protects work across successive saves.

2 Marks

Define a .blend file and state what it can contain.
State the menu path and the keyboard shortcut for the Save command.
List the three choices offered by the save on quit prompt.
Name the keyboard shortcut used to save the Startup File in Blender 4.5 LTS.
State what the asterisk before the file name in the window title bar indicates.

5 Marks

Explain the difference between Save As and Save Copy, including which file becomes the active document after each command is used.
Describe how Save Incremental works, including its shortcut and how it names successive versions on disk.
Compare Recover Last Session and Recover Auto Save, stating what each reads and when each should be used.

10 Marks

A student has spent an hour building a scene and has not yet saved it. Outline a complete procedure for naming and saving the file, creating a versioned backup, and confirming through the title bar and quit prompt that the work is protected before closing Blender safely.
Explain why Blender's auto save and recovery features should be treated only as a fallback rather than a primary method of protecting work, and describe how a sensible file naming and incremental save strategy provides a more reliable safeguard.

2 Marks

Define the Blender File Browser editor.
State the keyboard shortcuts for Open and for Save As in Blender.
List the three regions of the File Browser.
Name the four panels found in the source list.
State the three display modes available in the File Browser.

5 Marks

Explain when the File Browser appears in Blender, including which File menu operations invoke it and why a plain Save does not.
Describe the procedure for creating a new folder in the File Browser.
Explain how filtering by type, filtering by name with the wildcard, and sorting help manage a crowded folder.

10 Marks

A student must organise a course project by saving several .blend files and imported textures into a tidy folder structure. Apply the features of the File Browser to outline how the student would create the folders, navigate between them using the path field and header buttons, and locate the most recent save and the correct texture, justifying the choice of display mode and filters at each step.
Compare the Blender File Browser with the operating system file explorer across availability, file awareness, bookmarks and recent lists, and operator options, and explain why Blender uses its own built in browser rather than the operating system dialog for file operations.

2 Marks

Define a data-block in the context of a Blender .blend file.
State the menu path used to append data from another .blend file.
List three file formats that can be brought into Blender using the Import command.
Name the command that embeds external textures inside the .blend file.
State the defining property of Append that distinguishes it from Link.

5 Marks

Explain the difference between Append and Link for reusing native .blend data, covering how each stores the data and what happens when the source file is later edited.
Describe the procedure for appending a single object from a saved .blend file, including how Blender presents the source file in the File Browser.
Explain what a library override is and why it is needed when working with a linked rig.

10 Marks

A student team is producing several animated shots that all share one character rig, while each animator must pose that rig differently in their own shot. Analyse whether Append, Link, or Link with a library override should be used, and justify the choice with reference to updates, editability, and the single source of truth.
A student prepares a scene with several image textures and must submit it as a single portable file to a classmate who reports pink, missing textures on opening it. Explain how Blender stores external resources by default, identify the cause of the problem, and justify the corrective steps that produce a self-contained file.

2 Marks

Which keys switch between vertex, edge, and face selection modes in Edit Mode?
What is the difference between A and Alt A in Edit Mode?
Which shortcut and click combination selects an edge loop?
What does the Loop Cut tool do, and which shortcut invokes it?
Why must X-Ray be enabled for box, circle, or lasso select to catch hidden geometry?

5 Marks

Distinguish an edge loop from an edge ring, including the shortcut and the resulting selection for each.
Describe the box, circle, and lasso selection methods and how each is invoked and controlled.
Explain the three stages of placing and sliding a loop cut, including the roles of scroll, the first click, and the second click.

10 Marks

Explain the selection modes and basic selection methods of Edit Mode, covering the three modes, click and extend behaviour, select and deselect all, and the region-based methods with the X-Ray caveat.
Describe loop and ring selection and the Loop Cut tool, explaining how they relate to mesh topology, how a ring underlies the loop cut preview, and how selection tools differ from editing tools that create new geometry.

2 Marks

What is the keyboard shortcut for the Extrude Region tool in Edit Mode?
What is the keyboard shortcut for the Inset Faces tool, and how do you switch to individual insets?
When a single vertex is extruded, what new geometry is created?
Along which direction does Extrude Region move a face by default?
What does right click or Esc cancel during an extrude, and what remains behind?

5 Marks

Explain what extrusion means and describe how it acts on a vertex, an edge, and a face.
Distinguish Extrude Region, Extrude Along Normals, and Extrude Individual, giving a use case for each.
Describe the beginner trap where cancelling an extrude move leaves doubled vertices, and explain how to avoid and clean it.

10 Marks

Describe the Inset Faces tool in full: its shortcut and menu path, how thickness and depth are set, the difference between region and individual insets, and how it differs from extrude.
Walk through the complete inset then extrude workflow to build a recessed panel on a cube face, naming each step, shortcut, and confirmation action, and explain why this pattern is central to hard surface modelling.

2 Marks

What is the keyboard shortcut to start the Bevel tool in Edit Mode?
During an active Bevel, what does scrolling the mouse wheel change?
Which shortcut starts Edge Slide, and what selection does it act on?
Name the shortcut for Shrink/Fatten and state the direction along which it moves geometry.
What is the difference between Rip Region (V) and Rip Fill (Alt V)?

5 Marks

Explain how Bevel produces a chamfer versus a rounded fillet, describing the roles of width, segments, and the Profile value.
Compare Edge Slide with a plain grab (G), explaining why Edge Slide preserves the surface shape.
Describe how Smooth Vertices relaxes a mesh, including the roles of factor and iterations and one drawback of heavy smoothing.

10 Marks

Describe the five refinement tools covered in this session (Bevel, Edge Slide, Shrink/Fatten, Rip Region, and Smooth Vertices), giving for each its shortcut, what it changes, and a typical use case.
Explain why Shrink/Fatten produces an even offset over a curved surface while scaling does not, and outline a full workflow to bevel an edge and slide an edge loop on a cube, including how to fine tune the values afterward.

2 Marks

Which key activates the Knife tool in Blender 4.5, and what does Shift K do differently?
Which keys confirm a Knife cut, and which key cancels it?
In the 4.5 keymap, which modifier gives Midpoint Snap and which gives Ignore Snap while cutting?
What does Ctrl LMB do in the Poly Build tool?
Name the Poly Build setting that merges two adjacent triangles into a single quad.

5 Marks

Explain how a cut is drawn and confirmed with the Knife, including the meaning of the yellow preview line and aqua dots during the process.
Describe the three states of the Angle Constraint toggle in the Knife tool and how axis locking with X, Y, or Z differs from it.
List the four Poly Build mouse actions and state the result of each on the mesh.

10 Marks

Compare the Knife and Poly Build tools across purpose, whether they add new geometry, activation, typical use, and confirmation behaviour, and explain which tool you would choose for cutting a panel seam versus rebuilding a clean cage over a sculpt.
Describe the complete workflow of using Poly Build for retopology, covering activation, adding and editing geometry, the Create Quads setting, and the role of surface Snapping and Auto Merge, and explain why quads are preferred over triangles for animation friendly meshes.

2 Marks

Define a profile in the context of the Spin and Screw tools.
What does the 3D cursor determine when running the Spin tool?
State what an Angle of 360 degrees produces in the Spin tool.
Name the two Screw settings that control coil smoothness and coil count.
What effect does setting Axis Z to -1 have in the Screw tool?

5 Marks

Explain the difference between plain Spin and Spin with Use Duplicates, and give two practical uses of radial duplication.
Describe how the Screw tool reads an open profile to compute its helical offset, and state the error message that appears when the selection is invalid.
Explain the trade off between the number of Steps and geometry cost in the Spin tool, and how doubled vertices are removed after a full revolution.

10 Marks

Describe the complete workflow for modelling a glass with the Spin tool, from drawing the profile through setting the operator panel values, and list the common mistakes to avoid.
Compare the Spin and Screw tools in terms of mechanism, required profile, key settings, and typical output shapes, explaining why the helical offset is the single distinguishing feature between them.