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--- math [2019/08/26 18:12] – korshun
+++ math [2019/08/26 18:26] (current) – [Length] korshun
@@ Line 192: / Line 192: @@
 ===== Vector math =====
-==== VectorLength3D ====
+Vector math functions come in 2D and 3D versions. All vector math functions operate only on fixed-point vectors. No integer versions are available.
-''fixed VectorLength3D(fixed x, fixed y, fixed z)''
-A 3D version of [[zdoom>VectorLength]]. Returns the length of the 3D vector.
+Vectors are passed as arguments named ''x'', ''y'', ''z''.
+If a function returns a vector, it uses [[multiple return values]], returning vector components in the same XYZ order, so ''r1'' is X, ''r2'' is Y and ''r3'' is Z.
+If a function accepts more than one vector, the first vector is passed as ''x1'', ''y1'', ''z1'', and the second one as ''x2'', ''y2'', ''z2''.
+==== Length ====
+  * 2D: [[zdoom>VectorLength]] -- already built into ZDoom.
+  * 3D: ''fixed VectorLength3D(fixed x, fixed y, fixed Z)''
+These functions return the length of the input vector. ''VectorLength3D'' is implemented efficiently as ''VectorLength(VectorLength(x, y), z)''.
+==== Dot product ====
-==== dot ====
   * 2D: ''fixed dot2(fixed x1, fixed y1, fixed x2, fixed y2)''
   * 3D: ''fixed dot3(fixed x1, fixed y1, fixed z1, fixed x2, fixed y2, fixed z2)''
-Returns the [[wp>dot product]] of two vectors. Shorthand for writing out ''FixedMul(x1, x2) + FixedMul(y1, y2) + ...''.
+These functions return the sum of components of a vector obtained by componentwise multiplication of the two input vectors, also known as the [[wp>dot product]]. They are shorthands for writing out ''FixedMul(x1, x2) + FixedMul(y1, y2) + ...''.
+==== Normalization ====
-==== normalize ====
   * 2D: ''fixed, fixed normalize2d(fixed x, fixed y)''
   * 3D: ''fixed, fixed, fixed normalize3d(fixed x, fixed y, fixed z)''
-[[wp>Normalized vector|Normalizes]] the vector and returns the result using [[multiple return values]].
+These functions return the input vector scaled to have length ''1.0'', also known as [[wp>Normalized vector|normalizing]] the input vector, and return the result using [[multiple return values]].
-=== Example usage ===
+=== Examples ===
 <code>
 normalize3d(x, y, z);

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