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An ACS library for ZDoom-based ports

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math [2019/04/20 19:58] – [Significant square roots and logarithms] korshunmath [2019/07/04 20:44] – [AnglesToVector] korshun
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 Converts the vector's direction to a pair of angles (angle, pitch) and returns them using [[multiple return values]]. Converts the vector's direction to a pair of angles (angle, pitch) and returns them using [[multiple return values]].
  
-<note important>Remember that ZDoom uses inverted pitch angles on actors. ACSUtils functions don't invert pitches.</note>+<note important>Remember that ZDoom uses negated pitch angles on actors. ACSUtils functions don't invert pitches.</note>
  
 === Example usage === === Example usage ===
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     int pitch = r2;     int pitch = r2;
     SetActorAngle(tid, angle);     SetActorAngle(tid, angle);
-    SetActorPitch(tid, -pitch); // SetActorPitch expects inverted pitch.+    SetActorPitch(tid, -pitch); // SetActorPitch expects negated pitch.
 } }
 </code> </code>
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 Converts a pair of angles (angle, pitch) to a 3D vector of length ''1.0'', which points in the same direction, and returns it using [[multiple return values]]. Converts a pair of angles (angle, pitch) to a 3D vector of length ''1.0'', which points in the same direction, and returns it using [[multiple return values]].
  
-<note important>Remember that ZDoom uses inverted pitches on actors. ACSUtils functions don'invert pitches.</note>+<note important>Remember that ZDoom uses negated pitch angles on actors. ACSUtils functions don'use negated pitches.</note> 
 + 
 +=== Example usage === 
 + 
 +<code> 
 +AnglesToVector(GetActorAngle(0), -GetActorPitch(0)); // Un-negate actor pitch 
 +int dirX = r1; 
 +int dirY = r2; 
 +int dirZ = r3; 
 +</code> 
 + 
 ===== Logarithms ===== ===== Logarithms =====
  
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 <note important>Only bases higher than ''1.0'' are supported.</note> <note important>Only bases higher than ''1.0'' are supported.</note>
  
-<note important>Using ''ilogb'' with bases very close to ''1.0'' may produce a result that doesn't fit into a fixed.</note>+<note important>Using these functions with bases very close to ''1.0'' may produce a result that doesn't fit into a fixed.</note>
  
 Note that even the integer version has a fixed-point base. Note that even the integer version has a fixed-point base.
  
math.txt · Last modified: 2019/08/26 21:26 by korshun