SetCoordinates randomizer - Revision history

Uncle Reno at 19:02, 5 June 2010

2010-06-05T19:02:51Z

Eric Walch at 09:08, 1 November 2007

2007-11-01T09:08:21Z

Eric Walch: Randimization with setCoordinates

2007-10-31T22:34:29Z

Randimization with setCoordinates

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Oolites AI function '''setCoordinates''': needs 4 parameters separated with a space, like: "'''setCoordinates: wpu 0 0 0.8'''" what means a point at 80% of the line witchSpaceEntryPoint to planet.

Giles added a possibility to randomize each of the coordinates separately. For this you must add a "rand:" in front of the coordinate without an additional space.

rand: is a function with a lot of limitations. It first turns the number into an integer. Then calculates that many random numbers as the value of the integer is large. It adds all the random numbers and divides the answer by the original integer. This gives as result a real value between 0 and the original integer value.

Because the way it is calculated you shouldn't use a metric coordinate system as for a value of 20000 he has to calculate 20000 random numbers. This slows things down. You also cant use negative numbers. You also can't use numbers smaller that 1 as it only uses integers. So use is limited but it still leaves some useful use.

e.g.:
"setCoordinates: wpu 0 0 rand:1"

This will set a random coordinate anywhere on the line witchSpaceEntryPoint to planet.

or
"setCoordinates: pwr 0 0 rand:6"

This will set a point between 0 and 6 planet radii on the witchSpaceEntryPoint to planet line.

or
"setCoordinates: pwr rand:1 rand:1 rand:6"

This will set a point between 0 and 6 planet radii whit a deviation of maximal 1 planet radii on the witchSpaceEntryPoint to planet line.

Return to: [[OXP_howto_AI]]

← Older revision		Revision as of 19:02, 5 June 2010
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	This will set a point at 6 planet radii from he planet whit a deviation of maximal 1 planet radii on the line: witchSpaceEntryPoint to planet.		This will set a point at 6 planet radii from he planet whit a deviation of maximal 1 planet radii on the line: witchSpaceEntryPoint to planet.

−	Return to: [[~~OXP_howto_AI~~]]	+	Return to: [[OXP howto AI]]
		+
		+	[[Category:Oolite]][[Category:Oolite scripting]]

@@ Line 1: / Line 1: @@
 Oolites AI function '''setCoordinates''': needs 4 parameters separated with a space, like: "'''setCoordinates: wpu 0 0 0.8'''" what means a point at 80% of the line witchSpaceEntryPoint to planet.
-Giles added a possibility to randomize each of the coordinates separately. For this you must add a "rand:" in front of the coordinate without an additional space.
+Giles added a possibility to introduce randomize numbers in each of the coordinates separately. For this you must add a "rand:" in front of the coordinate without an additional space.
-rand: is a function with a lot of limitations. It first turns the number into an integer. Then calculates that many random numbers as the value of the integer is large. It adds all the random numbers and divides the answer by the original integer. This gives as result a real value between 0 and the original integer value.
+rand: is a function with a lot of limitations. It first turns the number into an integer. Then calculates that many random numbers as the value of the integer is large. It adds all the random numbers and divides the answer by the original integer. This gives as result a real value between 0 and 1.
-Because the way it is calculated you shouldn't use a metric coordinate system as for a value of 20000 he has to calculate 20000 random numbers. This slows things down. You also cant use negative numbers. You also can't use numbers smaller that 1 as it only uses integers. So use is limited but it still leaves some useful use.
+Calculating a random function this way will give a truly random value with a starting value of one. The more random values you add the more likely it becomes to get a value near the center of 0.5
 e.g.:
@@ Line 13: / Line 14: @@
 or
-   "setCoordinates: pwr 0 0 rand:6"
+   "setCoordinates: pwr rand:1 rand:1 6"
-This will set a point between 0 and 6 planet radii on the witchSpaceEntryPoint to planet line.
+This will set a point at 6 planet radii from he planet whit a deviation of maximal 1 planet radii on the line: witchSpaceEntryPoint to planet.
 Return to: [[OXP_howto_AI]]