Introduction to Game Development: Using Processing by James R Parker

Author:James R Parker [Parker, James R]
Language: eng
Format: epub
Tags: Computing, Internet
ISBN: 9781937585402
Publisher: Mercury Learning and Information
Published: 2015-05-18T21:00:00+00:00

The first step is to see if the sphere changes sides of the plane during the time interval. The situation is diagrammed in Figure 6.4: the sphere at time T is labelled ST, and its center S = (Sx,Sy) is a distance DT from the plane and the positive side. At time T+1 the center of the sphere is at DT+1, and in the figure is on the opposite (negative) side of the plane. We must make sure that DT > r, or the sphere is intersecting the plane at the beginning.

FIGURE 6.4 Given the position of the sphere at time T and T+1, did the sphere pass through the plane?

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