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comparison org/touch.org @ 255:e6e0bb3057b2

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minor edits
author Robert McIntyre <rlm@mit.edu>
date Mon, 13 Feb 2012 23:44:15 -0700
parents 91654978c8e0
children c39b8b29a79e
comparison
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254:91654978c8e0 255:e6e0bb3057b2
120 (defn ->triangle [points] 120 (defn ->triangle [points]
121 (apply #(Triangle. %1 %2 %3) (map ->vector3f points))) 121 (apply #(Triangle. %1 %2 %3) (map ->vector3f points)))
122 #+end_src 122 #+end_src
123 123
124 It is convienent to treat a =Triangle= as a vector of vectors, and a 124 It is convienent to treat a =Triangle= as a vector of vectors, and a
125 =Vector2f= and =Vector3f= as vectors of floats. (->vector3f) and 125 =Vector2f= or =Vector3f= as vectors of floats. (->vector3f) and
126 (->triangle) undo the operations of =(vector3f-seq)= and 126 (->triangle) undo the operations of =(vector3f-seq)= and
127 =(triangle-seq)=. If these classes implemented =Iterable= then =(seq)= 127 =(triangle-seq)=. If these classes implemented =Iterable= then =(seq)=
128 would work on them automitacally. 128 would work on them automitacally.
129 129
130 ** Decomposing a 3D shape into Triangles 130 ** Decomposing a 3D shape into Triangles
740 feature so prominently in our lives. But humans have far more than the 740 feature so prominently in our lives. But humans have far more than the
741 five main senses. There are internal chemical senses, pain (which is 741 five main senses. There are internal chemical senses, pain (which is
742 *not* the same as touch), heat sensitivity, and our sense of balance, 742 *not* the same as touch), heat sensitivity, and our sense of balance,
743 among others. One extra sense is so important that I must implement it 743 among others. One extra sense is so important that I must implement it
744 to have a hope of making creatures that can gracefully control their 744 to have a hope of making creatures that can gracefully control their
745 own bodies. It is Proprioception which is the sense of the location 745 own bodies. It is Proprioception, which is the sense of the location
746 of each body part in relation to the other body parts. 746 of each body part in relation to the other body parts.
747 747
748 Close your eyes, and touch your nose with your right index finger. How 748 Close your eyes, and touch your nose with your right index finger. How
749 did you do it? You could not see your hand, and neither your hand nor 749 did you do it? You could not see your hand, and neither your hand nor
750 your nose could use the sense of touch to guide the path of your hand. 750 your nose could use the sense of touch to guide the path of your hand.