VRGBAOut | SuperCollider 3.13.0 Help

Description

Groups single-channel red, green, blue, and alpha color values into the required 4-dimensional RGBA pixel output color signal.

Supported Rates: pixel

Class Methods

.pr

Make a VRGBAOut VGen at pixel rate.

Arguments:

red	The red color component value, between 0 and 1.
green	The green color component value, between 0 and 1.
blue	The blue color component value, between 0 and 1.
alpha	The alpha blending component values, between 0 and 1, with 0 meaning completely transparent and 1 meaning completely opaque.

Returns:

The vector VVec4.pr(red, green, blue, alpha)

dimensions

input	output
1, 1, 1, 1	4

// Demonstration of alpha blending between two Scinths. First we load two images:
(
~molly = ScinImageBuffer.read(path: "~/src/TestGoldImages/sourceMedia/molly.png".standardizePath);
~storm = ScinImageBuffer.read(path: "~/src/TestGoldImages/sourceMedia/storm.png".standardizePath);
)

// Then render the first image in a Scinth:
(
~m = ScinthDef.new(\m, {
    VSampler.pr(~molly, VTexPos.pr);
}).add;
)

(
~p = Scinth.new(\m);
)

// Then use VRGBAOut to render a second image on top, using the flower pattern
// described in the VDot example. Areas inside the flower will render opaque,
// there's a transition border with width controllable by the "bleed" parameter,
// and then areas outside of the flower render with clear alpha, showing the
// image from the first Scinth underneath.
(
~flower = ScinthDef.new(\flower, { |lobes=5, rad=1, bleed=9|
    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 * lobes)) * rad;
    var storm = VSampler.pr(~storm, VTexPos.pr);
    VRGBAOut.pr(VX.pr(storm), VY.pr(storm), VZ.pr(storm),
        1.0 - VClamp.pr(bleed * (VLength.pr(pos) - r), 0.0, 1.0));
}).add;
)

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

helpfile source: /tmp/tmpjbuo4r8ibaryon_Scintillator/Scintillator/Classes/VRGBAOut.schelp
link::Scintillator/Classes/VRGBAOut::

VRGBAOut
Extension

Description

Class Methods

.pr

Arguments:

Returns:

Examples

VRGBAOutExtension

Description

Class Methods

.pr

Arguments:

Returns:

Examples

VRGBAOut
Extension