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Our ship is defined mathematically, which makes it convenient to generate. The relation between the Frame number (0 to 20) and relative width is:

Rel_B = 0.5 - 0.005 * ( Frame - 10 )^2

Figure 1   Our waterline shape is defined by a mathematical function

The shape of the waterline is a polynomial, see figure 1. You can enter this function in the Geometry class in the same way as in tutorial 1.

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 Add the following relation to the class Geometry:

Waterline(@Rel_B,@Frame:STR$(StartFrame) + "(" + STR$(FrameStep) + ")" + STR$(EndFrame))

See figure 2.

Figure 2   Adding an object containing a function

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 In the class Geometry, create a new relation:

B_Frame = 2 * B * Rel_B

The dimension of B_Frame is meters (m).

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