Find the intersection of a line with a plane: Difference between revisions

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   N ← 0 0 1
   P ← 0 0 5
-  t ← (+/(P - D) × N) ÷ +/V × N
+  dot ← {+/⍺×⍵}
+  t ← ((P - D) dot N) ÷ V dot N
   I ← D + t × V
 </lang>