raisim::noiseUtils

class · #include <raisim/Terrain.hpp>

Internal: numeric helpers of the terrain noise generator.

Static member functions

fastFloor static

static std::int64_t fastFloor(double f) noexcept

Floor as a SIGNED integer. Returning an unsigned type would wrap every negative result to ~1.8e19, which breaks x -= fastFloor(x) in PerlinNoise::sample below. Truncation toward zero already equals floor for f >= 0 and for exact negative integers; only a negative value with a fractional part needs the extra -1.

Parameters

Parameter	Description
f (in)	value inside the int64 range

Returns floor(f)

fastRound static

static std::int64_t fastRound(double f) noexcept

Parameters

Parameter	Description
f (in)	value

Returns f rounded to the nearest integer, halves away from zero

map static

static double map(
    double value,
    double lower0,
    double upper0,
    double lower1,
    double upper1)

Linearly maps value from [lower0, upper0] to [lower1, upper1] (no clamping).

Parameters

Parameter	Description
value (in)	input value
lower0 (in)	input range start
upper0 (in)	input range end
lower1 (in)	output range start
upper1 (in)	output range end

Returns the mapped value