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// Given a Direction tuple like any of the examples // below: // Up. North. R(100,32,0), Q(1,0,0,30) HEADING 30 by 10 // // Calculate what that direction would be if expressed // as a unit vector instead. // // This is accomplished by performing the matrix rotation // on a vector that begins as V(0,0,1) and seeing what // the result is. // // // Because you can't pass things out of a program, // global variables must be used here for the output. // INPUT: 1 parameter: the Direction vector. // OUTPUT: tfUnit, a Vector containing the xyz coords of // the output. // // All "local" variables begin with "tf" to help // prevent them from clashing with the other // variables you might have used in the global // namespace of KOS.

declare parameter tfDir.

// Rotation angles for rotation matrix: set tfA to tfDir:yaw. set tfCosA to cos(tfA). set tfSinA to sin(tfA).

set tfB to tfDir:pitch. set tfCosB to cos(tfB). set tfSinB to sin(tfB).

set tfC to tfDir:roll. set tfCosC to cos(tfC). set tfSinC to sin(tfC).

set tf11 to tfCosA*tfCosC + tfSinA*tfSinB*tfSinC . set tf21 to tfCosC*tfSinA*tfSinB - tfCosA*tfSinC . set tf31 to tfCosB*tfSinA . set tf12 to tfCosB*tfSinC . set tf22 to tfCosB*tfCosC . set tf32 to 0-tfSinB . set tf13 to tfCosA*tfSinB*tfSinC - tfCosC*tfSinA . set tf23 to tfSinA*tfSinC + tfCosA*tfCosC*tfSinB . set tf33 to tfCosA*tfCosB . set tfV to V( 0,0,1 ).

set tfUnit to V( tf11*tfV:x + tf21*tfV:y + tf31*tfV:z , tf12*tfV:x + tf22*tfV:y + tf32*tfV:z , tf13*tfV:x + tf23*tfV:y + tf33*tfV:z ) .

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