Displaced Halation hydra
From Adobe Labs
<languageVersion : 1.0;>
/**
David Wicks
thingsiam.com
**/
kernel StrangeDisplacer
< nameSpace : "thingsiam";
description : "creates strange displaced halation effects";
>
{
parameter float turbulence
<
minValue:float(0);
maxValue:float(3.14);
defaultValue:float(0.1);
>;
parameter float dropOff
<
minValue:float(1.0);
maxValue:float(0.8);
defaultValue:float(0.9);
>;
parameter float2 dist
<
minValue:float2(-10, -10 );
maxValue:float2(10, 10 );
defaultValue:float2(0.0, 0.0 );
>;
parameter float2 linDist
<
minValue:float2(-10, -10 );
maxValue:float2(10, 10 );
defaultValue:float2(0.0, 0.0 );
>;
input image4 src;
output pixel4 dst;
void
evaluatePixel()
{
//some fun with trig values
float2 pos = outCoord();
float cosine = cos(outCoord().x*turbulence);
float sine = sin(outCoord().y*turbulence);
float2 offset = float2( dist.x*cosine + linDist.x, dist.y*sine + linDist.y );
float fade = 1.0;
//blending idea taken from the "light-tunnel" example
pixel4 color = max( sample( src, pos ), sample( src, pos+offset )*fade );
//fake for-loop
fade *= dropOff;
pos += offset;
color = max( color, sample( src, pos+offset )*fade );
fade *= dropOff;
pos += offset;
color = max( color, sample( src, pos+offset )*fade );
fade *= dropOff;
pos += offset;
color = max( color, sample( src, pos+offset )*fade );
fade *= dropOff;
pos += offset;
color = max( color, sample( src, pos+offset )*fade );
fade *= dropOff;
pos += offset;
color = max( color, sample( src, pos+offset )*fade );
fade *= dropOff;
pos += offset;
color = max( color, sample( src, pos+offset )*fade );
fade *= dropOff;
pos += offset;
color = max( color, sample( src, pos+offset )*fade );
dst = color;
}
}
