Is "perlin:get2d({x = pos.x, y = pos.z})" from -1 to 1 or from 0 to 1?

[paramat]

Sorry to ask, i've searched online for hours.
If for example ...
perlin = minetest.env:get_perlin(SEEDDIFF, 3, 0.5, 150)
What range of values does ...
perlin:get2d({x = pos.x, y = pos.z})
... give? -1 to 1 or 0 to 1?

[PilzAdam]

Just add an math.abs() arround it and you can be sure its not under 0.

[paramat]

Okay thanks i appreciate a reply. I'm adapting the conifers mod to my needs by spawning by perlin not altitude, i eventually managed to have perlin value output to the terminal using print ... and yes it is -1 to 1 as i hoped.

EDIT hmmm ... actually i see it occasionally exceeds the -1 to 1 range.

[Hybrid Dog]

sorry for posting to an old topic

hmmm ... actually i see it occasionally exceeds the -1 to 1 range.

l've got a problem, it even exceeded to -1.7 (which remembers me to approximately sqrt(3)). And l use perlin noise for the top of the nether forest, so l need to know where it begins.
What is the range of perlin noise?

[srifqi]

Looks like Minetest's PerlinNoise is buggy. You can use clamp function:

Your phone or window isn't wide enough to display the code box. If it's a phone, try rotating it to landscape mode.

Code: Select all

local function clamp(value, min, max)
    if value<min then return min end
    if value>max then return max end
    return value;
end


[Hybrid Dog]

Looks like Minetest's PerlinNoise is buggy. You can use clamp function:

Your phone or window isn't wide enough to display the code box. If it's a phone, try rotating it to landscape mode.

Code: Select all

local function clamp(value, min, max)
    if value<min then return min end
    if value>max then return max end
    return value;
end


this would make a flat top, l currently use another fix
https://github.com/HybridDog/minetest-n ... 5c1dcdR486