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given drawings

D = { l1 .. ln }
E = { m1 .. mn }

find the transformation T that transforms D into E

is it possible to reconstruct the 'real' model

R = { r1 .. rn } ?

Td and Te are projections of R3 -> R2

Td : R -> D
Te : R -> E

       plane
         |
    ..../|     * object
eye -----|   *    *
    ....\|      *
         |



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