Constant Radius Curves. A Mainstay in Good Design

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Here’s an interesting question sent in this morning by a student:

Hi Graham,
I have started on the mesh and immediately have a question, kind of a fundamental one. On the Audi design the bumper has positional breaks as it transitions up and down.

Knowing this, does the curve I just drew still want to exhibit this kind of acceleration towards the ends (like on a hood) or not?

(Pictured below)

[G

(pictured above)

This is better for the bumper, I think.

Regards,
K]

Answer:

Hi K,

The first crv. you showed has acceleration at the top and bottom, but a lot of crvs. on a model are simpy Railway crvs. and originate from the Clay Modeller using a plastic crv. template to drag a curved. sec. along say the bumper. Similarly the windscreen is usually formed by dragging 2 or 3 different crvd. alloy splines accross the clay slab and then sometimes, the edges of the windscreen or roof would be accelerated by dragging railway crvs. with a tighter rad.

Summary:

Beauty is often best created with the use of geometry. The Designer knows this and will only fiddle with pure geom. in certain areas of the ext. So Yes! the second crv. which is a constant Railway Curve is what you should stick to, but remember in complex areas, this rule may go out the window. Generally this surface would be a simple constant rad, but if the highlights are not what the designer requires he/she may well want the edges accelerated.

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