Prev | Next

Math

Most of these functions correspond to the C math library equivalents, and are called on a per-pixel basis. Given the limited precision of Fractional and FixedPoint types, some operations must be used with care. (Values are automatically clamped to the legal range).

Abs()

Absolute value.

Add(b)

b: second operand (IceImage)

Add two images.

AddWrap(b)

b: second operand (IceImage)

Add two images, but wrap the result so that it falls in the range 0-1. Something like a floating point modulo operation.

ACos()

Inverse cosine.

ASin()

Inverse sine.

ATan()

Inverse tangent.

ATan2(x)

x: Base (IceImage)

Inverse tangent operation. The image being operated upon is the perpendicular, or y.

Ceil()

Round up to nearest integer.

Cos()

Cosine.

Cosh()

Hyperbolic cosine.

Divide(b)

b: Denominator (IceImage)

Divide one image by another: the image being operated upon is the numerator.

Exp()

Inverse natural logarithm.

Floor()

Round down to nearest integer.

Hypot(b)

b: Second side of the "triangle" (IceImage)

Compute the hypotenuse of a triangle: the image being operated upon is the first operand.

Ln()

Natural logarithm.

Max(b)

b: Second operand (IceImage)

Result is the maximum of the two inputs.

Min(b)

b: Second operand (IceImage)

Result is the minimum of the two inputs.

Multiply(b)

b: Multiplicand (IceImage)

Multiply two images. The multiplier is the image being operated upon.

MultiplyAccumulate(b, c)

b: Scale (IceImage)
c: Offset (IceImage)

Mutiply image a by b and add c.   

MultiplyComplement(b)

b: Second operand.

Implements a * (1 − b). a  is the image being operated upon.

Round()

Round to nearest integer.

Sign()

Signum function. Return value is 1 for positive values, and −1 for negative ones. (Note: Should probably be called Sgn(), to conform to common mathematics convention).

Sine()

Sine function.

Sinh()

Hyperbolic sine.

SmoothStep(min, max)

min: Lower threshold (IceImage)
max: Upper threshold (IceImage)

Return 0 if less than the lower threshold, 1 if greater than the upper threshold, and smoothly varying in between. (A cubic is used, with c1 continuity at both ends).

Sqrt()

Square root.

Subtract(b)

b: Subtrahend (IceImage)

Subtract two images.  The minuend is the image being operated upon.

Tan()

Tangent function.

Tanh()

Hyperbolic tangent.

Prev | Next