Trans RINA, Vol 153, Part C1, Intl J Marine Design, Jul - Dec 2011
incorporated in the latest version of Alias Autostudio 2011.
Figure 4 Highlights in boat design
Figure 5 Four ways of treating a corner, shaded with a reflection map
5.2 AUTOMOTIVE DESIGN LANGUAGE: SURFACE CONTINUITY
We can take a simple example and look at how the automotive designer can treat a corner. There are four possibilities. Please refer to the Figure 5 and 6
Position, or G0 This is where the surface edges are in contact but there is no flow at all between the surfaces
Tangency, or G1 There is a basic flow between the surfaces, but there is an abrupt change in radius at the start and end of the fillet as it joins to the main surfaces
Curvature, or G2 There is a more advanced flow between the surfaces, the
radius of the fillet changes
progressively so that there is no abrupt change in radius of the fillet.
G3 Curvature, or G3 There is an even more advanced flow between the surfaces. The radius of the fillet changes progressively and furthermore the rate of change is also progressive. In my example below, the main surfaces have been modified to have an accelerated curvature as they lead up towards the fillet, and thus the transition is even more progressive, and the highlight is the smoothest
The ‘Zebra’ stripes in Fig 6 represent the highlights at various points on the surface; the green comb below the surfaces shows the acceleration of the curvature of the surface. These are part of the advanced surface analysis tools used in automotive design surfacing software. To produce G3 surfaces even using the most advanced software on the market has until recently, (2011), been a largely manual process, relying on the skill of the digital sculptor. Automatic production of G3 fillets has been
Figure 6 the same surfaces with a ‘zebra’ map
G Holland8analyses how G0, G1 and G2/G3 surface transitions are found in Natural Forms, Figure 7
G0
G1
Figure 7 Surface transitions in Natural forms Image Credit G Holland
The conclusion here is that G1 (tangency) is almost impossible to find in natural forms. It is an entirely ‘man made’ language of surface treatment.
G Holland9 analyses how G0, G1 and G2/G3 surface transitions are found in Product Design language in Fig 8
G2/G3
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©2011: The Royal Institution of Naval Architects
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