Minecraft Forums

For my Forge mod Zyin's HUD I am trying to get a very precise way to find out a horse's max jump height. I did some testing to see exactly what the value "EntityHorse.func_110215_cj()" returns in correlation to the horse's jump height. Here is my testing data:

func_110215_cj(), blocks jumped
0.46865 = 1.5 blocks
0.47179 = 1.5 blocks
0.49099 = 1.5 blocks
0.49262 = 1.625 blocks
0.49494 = 1.625 blocks
0.50000 = 1.625 blocks
0.50505 = 1.625 blocks
0.50937 = 1.75 blocks
0.51283 = 1.75 blocks
0.51358 = 1.75 blocks
0.52574 = 1.75 blocks
0.56227 = 2 blocks
...
0.90143 = 4.875 blocks
0.90297 = 4.875 blocks
0.90805 = 4.875 blocks
0.91588 = 5 blocks
0.91405 = 5 blocks
0.93901 = 5.25 blocks
0.94306 = 5.25 blocks
...
??? = 5.5 blocks (max according to the Wiki)

Snow pieces were used to increase block height by 0.125. If you look closely at the data you'll notice that the trend is not linear, so I ended up trying a quadratic fit for the data but it doesn't work very well for horses in the mid-range of jump strengths.

Does anyone know a function to translate "EntityHorse.func_110215_cj()" to amount of blocks jumped? Or is there a better way to determine this?

I did a quadratic regression using some of your data.

I used this set:

y = 6.327866259 x² - 0.967866358 x + .5640754617
With a greatest error of 3.375023868·10^-2

Reversing this function gives me some data:
1 block = ~0.34986
2 blocks = ~0.558938
3 blocks = ~0.701617
4 blocks = ~0.817308
5 blocks = ~0.917228
6 blocks = ~1.00647
7 blocks = ~1.08787
8 blocks = ~1.16319
9 blocks = ~1.23362
10 blocks = ~1.3

I did that but it wasn't completely accurate. I ended up solving this by simulating gravity and air resistance based on the jump strength of the entity. Here's the code:

EntityHorse horse = ...
double yVelocity = horse.func_110215_cj(); //horses's jump strength attribute
double jumpHeight = 0;
while (yVelocity > 0)
{
jumpHeight += yVelocity;
yVelocity -= 0.08;
yVelocity *= 0.98;
}
return jumpHeight;