The stylist responsible for the design of the exterior of the vehicle is the one who develops the proportions, shape, and surfaces of the vehicle. Exterior design is first done by a series of digital or manual drawings, and clay (industrial plasticine) models are developed from those drawings.
3 and 5 CNC Milling Machines are utilized in creating the clay model of the final design.
Even in modern times with 3d software and virtual models on powerwalls, the clay model is still the most important tool in evaluating the design of a car and therefore used throughout the industry. The data from these models are then used to create a further mockups of the final design.
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