Converting perlin noise from mapgen.cpp to lua format

[paramat]

So i found the perlin for choosing normal or desert biomes ...

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double d = noise2d_perlin(
0.6+(float)p2d.X/250, 0.2+(float)p2d.Y/250,
seed+9130, 3, 0.50);
if(d > 0.45)
return BT_DESERT;
if(d > 0.35 && (noise2d( p2d.X, p2d.Y, int(seed) ) + 1.0) > ( 0.45 - d ) * 20.0 )
return BT_DESERT;
return BT_NORMAL;

0.6 and 0.2 seem to be the offsets, 250 the scale, 9130 the seeddiff, 3 octaves, 0.5 persistence.
Would the lua equivalent perlin pattern be ...

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local perlin1 = env:get_perlin(9130, 3, 0.5, 250)
local noise = perlin1:get2d({x=pos.x + 150, y=pos.z + 50})

?

Since 0.6 * 250 = 150 and 0.2 * 250 = 50.

I want to get a grip on the pattern used for desert biomes :)

[paramat]

I found a way to test this and the answer is yes, sorry to bother you with the question ;)

[Casimir]

I hope you will use that for your conifers mod. I really like it, but is always looks strange when they spawn at the edge of the desert.

[paramat]

Funny you post that i am about to do exactly that for perlin conifers ongen 0.1.2.