KBE3D / KBCore / Cesium / Math

Math

Math functions.

函数

函数	描述
sign	Returns the sign of the value; 1 if the value is positive, -1 if the value is negative, or 0 if the value is 0.
signNotZero	Returns 1.0 if the given value is positive or zero, and -1.0 if it is negative. This is similar to Math#sign except that returns 1.0 instead of 0.0 when the input value is 0.0.
toSNorm	Converts a scalar value in the range [-1.0, 1.0] to a SNORM in the range [0, rangeMaximum]
fromSNorm	Converts a SNORM value in the range [0, rangeMaximum] to a scalar in the range [-1.0, 1.0].
normalize	Converts a scalar value in the range [rangeMinimum, rangeMaximum] to a scalar in the range [0.0, 1.0]
sinh	Returns the hyperbolic sine of a number. The hyperbolic sine of value is defined to be (ex - e-x)/2.0 where e is Euler's number, approximately 2.71828183.
cosh	Returns the hyperbolic cosine of a number. The hyperbolic cosine of value is defined to be (ex + e-x)/2.0 where e is Euler's number, approximately 2.71828183.
lerp	Computes the linear interpolation of two values.
toRadians	Converts degrees to radians.
toDegrees	Converts radians to degrees.
convertLongitudeRange	Converts a longitude value, in radians, to the range [-Math.PI, Math.PI).
clampToLatitudeRange	Convenience function that clamps a latitude value, in radians, to the range [-Math.PI/2, Math.PI/2). Useful for sanitizing data before use in objects requiring correct range.
negativePiToPi	Produces an angle in the range -Pi <= angle <= Pi which is equivalent to the provided angle.
zeroToTwoPi	Produces an angle in the range 0 <= angle <= 2Pi which is equivalent to the provided angle.
mod	The modulo operation that also works for negative dividends.
equalsEpsilon	Determines if two values are equal using an absolute or relative tolerance test. This is useful to avoid problems due to roundoff error when comparing floating-point values directly. The values are first compared using an absolute tolerance test. If that fails, a relative tolerance test is performed. Use this test if you are unsure of the magnitudes of left and right.
lessThan	Determines if the left value is less than the right value. If the two values are within absoluteEpsilon of each other, they are considered equal and this function returns false.
lessThanOrEquals	Determines if the left value is less than or equal to the right value. If the two values are within absoluteEpsilon of each other, they are considered equal and this function returns true.
greaterThan	Determines if the left value is greater the right value. If the two values are within absoluteEpsilon of each other, they are considered equal and this function returns false.
greaterThanOrEquals	Determines if the left value is greater than or equal to the right value. If the two values are within absoluteEpsilon of each other, they are considered equal and this function returns true.
factorial	Computes the factorial of the provided number.
incrementWrap	Increments a number with a wrapping to a minimum value if the number exceeds the maximum value.
isPowerOfTwo	Determines if a non-negative integer is a power of two. The maximum allowed input is (2^32)-1 due to 32-bit bitwise operator limitation in Javascript.
nextPowerOfTwo	Computes the next power-of-two integer greater than or equal to the provided non-negative integer. The maximum allowed input is 2^31 due to 32-bit bitwise operator limitation in Javascript.
previousPowerOfTwo	Computes the previous power-of-two integer less than or equal to the provided non-negative integer. The maximum allowed input is (2^32)-1 due to 32-bit bitwise operator limitation in Javascript.
clamp	Constraint a value to lie between two values.
setRandomNumberSeed	Sets the seed used by the random number generator in Math#nextRandomNumber.
nextRandomNumber	Generates a random floating point number in the range of [0.0, 1.0) using a Mersenne twister.
randomBetween	Generates a random number between two numbers.
acosClamped	Computes Math.acos(value), but first clamps value to the range [-1.0, 1.0] so that the function will never return NaN.
asinClamped	Computes Math.asin(value), but first clamps value to the range [-1.0, 1.0] so that the function will never return NaN.
chordLength	Finds the chord length between two points given the circle's radius and the angle between the points.
logBase	Finds the logarithm of a number to a base.
cbrt	Finds the cube root of a number. Returns NaN if number is not provided.
log2	Finds the base 2 logarithm of a number.
fastApproximateAtan	Computes a fast approximation of Atan for input in the range [-1, 1].
fastApproximateAtan2	Computes a fast approximation of Atan2(x, y) for arbitrary input scalars.

变量

变量	描述
EPSILON1	0.1
EPSILON2	0.01
EPSILON3	0.001
EPSILON4	0.0001
EPSILON5	0.00001
EPSILON6	0.000001
EPSILON7	0.0000001
EPSILON8	0.00000001
EPSILON9	0.000000001
EPSILON10	0.0000000001
EPSILON11	0.00000000001
EPSILON12	0.000000000001
EPSILON13	0.0000000000001
EPSILON14	0.00000000000001
EPSILON15	0.000000000000001
EPSILON16	0.0000000000000001
EPSILON17	0.00000000000000001
EPSILON18	0.000000000000000001
EPSILON19	0.0000000000000000001
EPSILON20	0.00000000000000000001
EPSILON21	0.000000000000000000001
GRAVITATIONALPARAMETER	The gravitational parameter of the Earth in meters cubed per second squared as defined by the WGS84 model: 3.986004418e14
SOLAR_RADIUS	Radius of the sun in meters: 6.955e8
LUNAR_RADIUS	The mean radius of the moon, according to the "Report of the IAU/IAG Working Group on Cartographic Coordinates and Rotational Elements of the Planets and satellites: 2000", Celestial Mechanics 82: 83-110, 2002.
SIXTY_FOUR_KILOBYTES	64 * 1024
FOUR_GIGABYTES	4 * 1024 * 1024 * 1024
PI	pi
ONE_OVER_PI	1/pi
PI_OVER_TWO	pi/2
PI_OVER_THREE	pi/3
PI_OVER_FOUR	pi/4
PI_OVER_SIX	pi/6
THREE_PI_OVER_TWO	3pi/2
TWO_PI	2pi
ONE_OVER_TWO_PI	1/2pi
RADIANS_PER_DEGREE	The number of radians in a degree.
DEGREES_PER_RADIAN	The number of degrees in a radian.
RADIANS_PER_ARCSECOND	The number of radians in an arc second.