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EXCERCISE 3.7 : 3.7 The mapping from a point in object or world coordinates to one...

EXCERCISE 3.7 :


3.7 The mapping from a point in object or world coordinates to one in screen coordinates is well defined. It is not invertible because we go from three di-mensions to two dimensions. Suppose, however, that we are working with a two-dimensional application. Is the mapping invertible? What problem can arise if you use a two-dimensional mapping to return to a position in object or world coordinates by a locator device?

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Answer #1

Ans: No, it is still not invertible.

There are a couple of potential problems.

  • One is that the application program can map different points in user coordinates to the same point in screen coordinates.
  • Second, a given position on the screen when transformed back into user coordinates may lie outside the user window,
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