VDot

See also: VCross

Description

---

Computes the dot product of two vectors u and v.

Supported Rates: frame, shape, pixel

Class Methods

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VDot.fr(u, v)

VDot.sr(u, v)

VDot.pr(u, v)

Make a VDot VGen at requested rate.

Arguments

u

First vector input to cross product.

v

Second vector input to cross product.

Returns:

The dot product of u and v

Dimensions

input	output
1, 1	1
2, 2	1
3, 3	1
4, 4	1

Examples

---

// Demonstration of the use of dot product identity
// a dot b = mag(a) * mag(b) * cos(theta) to compute
// the angle between the x axis and the fragment
// position. This is compared against the position
// of a flower radial function and that drives the
// output value.
(
~flower = ScinthDef.new(\flower, { |l=5, k=1|
    var pos = VNormPos.pr;
    var posNorm = VNorm.pr(pos);
    var xaxis = VVec2.pr(1.0, 0.0);
    var theta = VDot.pr(posNorm, xaxis).acos;
    var r = abs(sin(theta * l)) * k;
    VBWOut.pr((1.0 - VDistance.pr(pos, r * posNorm)).abs);
}).add;
)

(
~k = Scinth.new(\flower);
)