CAD references can help an illustrator understand a product’s geometry, but they still need a clear brief. Identify the version of the design under review and explain which source files describe it. A detailed model is less useful when the team cannot tell whether it matches the intended appearance.
Choose the right CAD references
First, label the model by version and date. Explain whether it represents a finished design, an early concept, or only part of an assembly. If separate files describe different components, identify how they relate to one another.
For example, a housing model may omit a surface texture that appears in a product photograph. Flag that difference before drafting. The illustrator should not have to choose between conflicting references without an instruction.
Give each reference a purpose
| Reference | Question it can help resolve |
|---|---|
| CAD model | How do the surfaces, openings, and components relate in three dimensions? |
| Photographs | Which visible details are absent from the model, and which areas may be reflections or shadows? |
| Marked sketch | Which feature needs clarification, and what question should the team answer? |
| Proposed view list | What should each figure explain about the intended appearance? |
Keep confirmed details separate from assumptions. If a photograph shows an earlier prototype, label it accordingly. A short note can prevent the illustrator from combining features from two versions into one inconsistent drawing.
Review the views against the same model
Next, compare the front, rear, side, top, bottom, and perspective figures that the project uses. Check contours and the positions of repeated details. Each view should describe the same geometry.
Ask the application practitioner to review view selection and the intended treatment of the design. The USPTO design patent guide is the official starting point for U.S. design drawing practice.
Keep CAD references with the revision record
When the design changes, identify the affected source file and figures. Send one consolidated correction list rather than several conflicting screenshots. If a question remains open, assign it to the person who can confirm the detail.
Finally, review the delivered set against the approved references. Our design drawing samples can help you discuss view relationships. Use the references to explain the intended design clearly, rather than asking the illustrator to invent details for a more attractive result.
