Regeneration - Revision history

Zurg: Rewrote the terrain repair section to be a lot clearer. Minor changes elsewhere in light of that.

2025-01-23T02:04:46Z

Rewrote the terrain repair section to be a lot clearer. Minor changes elsewhere in light of that.

Heinermann at 18:10, 30 March 2021

2021-03-30T18:10:50Z

Heinermann: Correct healing rate calculations

2021-03-30T18:07:27Z

Correct healing rate calculations

Zurg: /* Healing Rates */

2015-08-06T23:10:16Z

‎Healing Rates

Zurg: /* Healing Rates */ hatnote; realtime

2015-08-06T07:09:04Z

‎Healing Rates: hatnote; realtime

DevliN: 1 revision imported: Restoring SC1 backup

2015-03-21T04:26:26Z

1 revision imported: Restoring SC1 backup

DevliN at 10:43, 23 November 2012

2012-11-23T10:43:04Z

New page

In [[StarCraft]], regeneration is the slow increase of a unit's health, shields, or energy.

===How It Works===
To understand regeneration, you have to understand that Starcraft hides data from you. Health and Shields each are stored in memory in 4 bytes, however Starcraft only tells you the last 3 bytes. The first byte is actually a hidden value which acts as a timer for regeneration. 1 byte = 8 bits, or 28 = 256.

Each frame, a certain regeneration amount is added (or subtracted) to the first byte, according to values in the mpqs:

*Protoss Shields: 7
*Zerg Health: 4
*Energy: 8
*Shield Battery: 1280
*Recharge Shields: -640 (-632 net)
*Burning Terran Building: -20
*Medic: 200
*Personnel Cloaking(Ghost): -18 (-10 net)
*Cloaking Field(Wraith): -21 (-13 net)
*Heal: -100 (-92 net)

SCVs repair units and buildings in a similar way, based on build time and total HP. Multiple SCVs increase the repair rate by adding them together. 
R = roundup(.9 * H/B) 
where R = repair rate in 1/256 of hp per frame, H = HP, B = build rate in SCMDraft. 
One important note is that R is a 2 byte value, which means that when R > 65535, it loops back over to 0. Here is an example: 
A Terran Barracks with a build time of 1, HP of 9999. 
R = roundup(.9 * 256*9999/1) = 2303770. R>65535, so it rolls over in multiples of 65535. 
R = 2303770- k65535, R = 10010. Note that this is still fairly large, and means that each SCV will repair approximately 39 HP every frame. 
A slightly more realistic value is that of the default battlecruiser with 500 HP, 2000 Build time: 
R= roundup(.9 * 500*256/2000) = 58. 

Building units follows the same formula, and this explains why some buildings/units come out injured, except they start out with 10% of the base HP, plus 1 frame of "repairing", plus the time it takes to build. In the case of the terran barracks, it will build in 1 frame and come out with .1 * 9999 + 10010/256 + 10010/256 = 1078.1 HP.

===Healing Rates===
Since Starcraft is normally played on fastest, or 24 fps, we can calculate the approximate rates of healing:
*Protoss shields use 7, so 256/7/24=~1.5 seconds per shield point.
*Zerg Health use 4, so 256/4/24=~2.67 seconds per health point.
*Medics' Healing uses 200, so 256/200/24=0.053 seconds per health point or 18.75 health per second.
*Shield batteries use 1280, so 256/1280/24=0.0083 seconds per shield point or 120 shields per second.

Other rates can be similarly calculated.
[[Category:StarCraft]]
[[Category:Reference]]

@@ Line 16: / Line 16: @@
 *Cloaking Field(Wraith): -21 (-13 net)
 *Heal: -100 (-92 net)
+<br />
 SCVs repair units and buildings in a similar way, based on build time and total HP. Multiple SCVs increase the repair rate by adding them together.<br />
-R = roundup(.9 * H/B)<br />
+<br />
-where R = repair rate in 1/256 of hp per frame, H = HP, B = build rate in SCMDraft.<br />
+'''R''' = roundup(0.9 * <u>H</u>/<u>B</u>)<br />
-One important note is that R is a 2 byte value, which means that when R > 65535, it loops back over to 0. Here is an example:<br />
+where '''R''' = repair rate in <u>hp</u> per <u>frame</u> (of animation), with:<br />
-A Terran Barracks with a build time of 1, HP of 9999.<br />
+<u>H</u> = health of the unit<br />
-R = roundup(.9 * 256*9999/1) = 2303770. R>65535, so it rolls over in multiples of 65535.<br />
+<u>B</u> = build time of the unit in SCMDraft (which is counted as ''frames of animation'')<br />
-R = 2303770- k65535, R = 10010. Note that this is still fairly large, and means that each SCV will repair approximately 39 HP every frame.<br />
+<br />
-A slightly more realistic value is that of the default battlecruiser with 500 HP, 2000 Build time:<br />
+<br />
-R= roundup(.9 * 500*256/2000) = 58.<br />
+''Further'', '''R2''' = 256*'''R''', and '''R2''' is the value that gets added or subtracted each frame to the first byte of a unit's HP. <br />
+One important note is that '''R2''' is a 2 byte value, which means that when '''R2''' > 65535, it loops back over to 0. Here is an example:<br />
-Building units follows the same formula, and this explains why some buildings/units come out injured, except they start out with 10% of the base HP, plus 1 frame of "repairing", plus the time it takes to build. In the case of the terran barracks, it will build in 1 frame and come out with .1 * 9999 + 10010/256 + 10010/256 = 1078.1 HP.
+<br />
-===Healing Rates===
+===Calculation of healing rates===
 ''The time used here is realtime.''
 Since Starcraft is normally played on fastest, or 42ms/frame, we can calculate the approximate rates of healing:

@@ Line 33: / Line 33: @@
 Since Starcraft is normally played on fastest, or 42ms/frame, we can calculate the approximate rates of healing:
 *Let sp = shield points, hp = hit points, f = frames, ms = milliseconds, s = seconds, p = fraction of points
-*Protoss shields use 7, (256p/sp / 7p/f) / (1000ms/s / 42ms/f) = 1.536 shield points per second.
+*Protoss shields use 7, (256p/sp / 7p/f) / (1000ms/s / 42ms/f) = 1.536 seconds per shield point.
 *Zerg Health use 4, so (256/4)/(1000/42) = 2.688 seconds per health point.
 *Medics' Healing uses 200, so (256/200)/(1000/42) = 0.05376 seconds per health point or ~18.6 health per second.

@@ Line 31: / Line 31: @@
 ===Healing Rates===
 ''The time used here is realtime.''
-Since Starcraft is normally played on fastest, or 24 fps, we can calculate the approximate rates of healing:
+Since Starcraft is normally played on fastest, or 42ms/frame, we can calculate the approximate rates of healing:
-*Protoss shields use 7, so 256/7/24=~1.5 seconds per shield point.
+*Let sp = shield points, hp = hit points, f = frames, ms = milliseconds, s = seconds, p = fraction of points
-*Zerg Health use 4, so 256/4/24=~2.67 seconds per health point.
+*Protoss shields use 7, (256p/sp / 7p/f) / (1000ms/s / 42ms/f) = 1.536 shield points per second.
-*Medics' Healing uses 200, so 256/200/24=0.053 seconds per health point or 18.75 health per second.
+*Zerg Health use 4, so (256/4)/(1000/42) = 2.688 seconds per health point.
-*Shield batteries use 1280, so 256/1280/24=0.0083 seconds per shield point or 120 shields per second.
+*Medics' Healing uses 200, so (256/200)/(1000/42) = 0.05376 seconds per health point or ~18.6 health per second.
 Other rates can be similarly calculated.
 [[Category:StarCraft]]
 [[Category:Reference]]

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