The big idea: The guide lists eight virtual prototyping tools. Memorised as a list they are unusable.
Sorted by the question each answers — shape it, test it, use it — you can pick the right one for a stated purpose.
Eight tools in three groups. Step through each group to see what it is actually for.
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Surface models
Define the outer skin only — no thickness, no interior. Used for complex curved styling such as a car body or a kettle shell, where the form matters and the internals come later.
Solid models
Define the whole volume, so the model has mass, a centre of gravity and material properties. Anything to be analysed or manufactured has to be a solid model.
Generative design
Inverts the process: you give the software the loads, fixings, material and allowed space, and it produces geometries — often organic, often ones no designer would have drawn.
Finite element analysis (FEA)
Divides a part into many small elements and predicts stress, deflection and where it will fail under a stated load, before anything is made.
Motion capture
Records how a real body actually moves, so the design can be tested against real movement rather than an assumed posture.
See how examiners mark answers
Answer exam-style questions with model answers. Learn exactly what earns marks and what doesn't.
Digital humans
- Percentile-accurate figures placed in the model
- Check reach, clearance and sight lines
- The ergonomics of A1.1, before a rig exists
VR and AR
- VR: the user stands inside the design at full size
- AR: the design is overlaid on the real place it will go
- Catches scale and context errors a screen hides
Haptic technology
- Adds force feedback to a virtual control
- A dial can be felt to click, resist or stop
- The nearest a virtual model gets to touch
The honest limit: A virtual prototype answers only what it was modelled to answer. It will tell you a handle is 180 grams and cannot tell you whether that is tiring after ten minutes.
Simulate to narrow the options; build to confirm.
What CAD gives the rest of the project
Renderings for feedback
Photorealistic images can be made early, before anything exists, so clients and users react to the look and the design improves.
Data for production
The CAD file holds exact sizes and goes straight to CAM or a 3D printer, so parts are made accurately with fewer errors.
VR walk-throughs
Car makers review new cars in VR headsets: the team checks the design before building it, rehearses assembly, and shows customers a car that does not yet exist.
Easy to share
One file can be sent to team members, clients and factories anywhere, so everyone comments on the same model.
How this is tested — choosing a virtual prototyping tool for a stated purpose. It comes up two ways:
Paper 1 — multiple choice
- Match a described activity to one of the eight tools.
- Pick the tool that answers a stated question.
Paper 2 — analysing a product
- Explain how and why a designer uses virtual prototypes on a named product.
- Explain the limits of a virtual prototype for a stated question.
The trap: Naming CAD and stopping. CAD is the software; the mark is in the specific tool — FEA, a digital human, generative design — and in what it answers.
A manufacturer is developing a new tractor cab. Explain how it would use virtual prototypes during development.
Model answer plan
See the answer broken into clear points, with guidance on how each point earns marks.