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| Procedural Pixar Eyes, based on Inigo Quilez "A Simple Eye" code. |
ORIGIN OF THE CODE
Based on this video by Inigo Quilez:http://www.youtube.com/watch?v=emjuqqyq_qc
OSL PROCEDURAL EYE (roughly translated)
I am converting the GLSL code into OSL code below:// original code by by Inigo Quilez
// http://www.youtube.com/watch?v=emjuqqyq_qc
// translated by Jimmy Gunawan
// 2013.08.19
// the matrix stuff is not added , yet...
// and I need to tweak the OSL code so that Texture Coordinate can be used
// fractional brownian motion
float fbm( vector Pos )
{
// this will return the classic cloud pattern noise
float f = 0.0;
f += 0.500 * noise(Pos); Pos *=2.02;
f += 0.250 * noise(Pos); Pos *=2.03;
f += 0.125 * noise(Pos); Pos *= 2.01;
f += 0.0625 * noise(Pos); Pos *- 2.04;
f /= 0.9375;
return f;
}
shader pixarEye(
color ColorBase = color(1,1,1),
color ColorEye = color(1,0,0),
color ColorGlow = color(0,1,0),
float myTime = 0.0,
output color ColOut = color(0.2)
)
{
//float myNoise = noise(1.0 * P); // frequency adjustable
// color myNoise = noise(1.0 * P); // frequency adjustable
// float myNoise = fbm(P);
//float background = smoothstep(-0.25, 0.25, P[0]);
float r = sqrt (dot(P,P));
float a = atan2(P[1], P[0]);
// this moves the pixel
// P[0] -= 1000;
//color col = color(1.0);
color col = ColorBase;
// adding some animation to the eyes
float ss = 0.5 + 0.5*sin(myTime);
float anim = 1.0 + 0.1*ss;
r *= anim;
if( r<0.8 )
{
//col = color(0.0, 0.3, 0.4);
col = ColorEye;
// adding the fbm noise
float f = fbm( 5.0 * P );
col = mix(col, color(0.2, 0.5, 0.4), f);
// adding glow yellow area?
f = 1 - smoothstep(0.2, 0.5, r);
//col = mix(col, color(0.9, 0.6, 0.2), f);
col = mix(col, ColorGlow, f);
// crazy wavy modulation
a += 0.1 * fbm ( 20.0*P );
// adding white fiber
f = smoothstep(0.3, 1.0, fbm( vector( 6.0*r, 20.0*a, 0.0 ) ) ); // changing contrast
col = mix(col, color(1.0), f);
// adding black fiber
f = smoothstep( 0.4, 0.9, fbm( vector( 10.0*r, 15.0*a, 0.0) ) );
col *= 1.0 - 0.9*f;
// multiplying with black on the edge
f = smoothstep( 0.6, 0.8, r);
col *= 1.0 - 0.8*f;
// adding dark circle to the center of the eyes
f = smoothstep(0.2, 0.25, r);
col *= f;
// fake reflection, the glint in the eye
f = 1.0 - smoothstep( 0.0, 0.3, length( P-vector(0.25,0.1,0.0)) );
col += color(1.0, 0.9, 0.8) * f * 0.9;
// the edge was too antialias, so added this blur on the eye edge
f = smoothstep(0.7, 0.8, r);
//col = mix(col, color(1.0), f);
col = mix(col, ColorBase, f);
}
ColOut = col;
}
Feel free to tweak the code, add parameters, replacing values with variables, but I think being able to write this code yourself and understand every steps that is explained by Inigo Quilez will be more beneficial to your OSL study.
I honestly learned a lot by converting and rewriting the code from Inigo's video, I think I will do that a couple of times until it really sticks in my brain.
EYEBALL TWEAK #001
- Vector INPUT is now added, so that you can use Texture Coordinate and adjust the Mapping
- Size of the Eye (Iris) is adjustable
- Size of the Pupil is adjustable (that black part)
- Eye Glint (fake reflection) is adjustable in position and actual contrast
Updated Code:
// origin by Inigo Quilez
// translated by Jimmy Gunawan
// 2013.08.19
// the matrix stuff is not added , yet...
// and I need to tweak the OSL code so that Texture Coordinate can be used
// fractional brownian motion
float fbm( vector Pos )
{
// this will return the classic cloud pattern noise
float f = 0.0;
f += 0.500 * noise(Pos); Pos *=2.02;
f += 0.250 * noise(Pos); Pos *=2.03;
f += 0.125 * noise(Pos); Pos *= 2.01;
f += 0.0625 * noise(Pos); Pos *- 2.04;
f /= 0.9375;
return f;
}
shader pixarEye(
color ColorBase = color(1,1,1),
color ColorEye = color(1,0,0),
color ColorGlow = color(0,1,0),
vector Vec = P,
float Scale = 0.5,
float PupilSize = 1.0,
float GlintPosX = 0.25,
float GlintPosY = 0.1,
float GlintMin = 0.0,
float GlintMax = 0.24,
float myTime = 0.0,
output color ColOut = color(0.2)
)
{
//float myNoise = noise(1.0 * P); // frequency adjustable
// color myNoise = noise(1.0 * P); // frequency adjustable
// float myNoise = fbm(P);
//float background = smoothstep(-0.25, 0.25, P[0]);
vector p = Vec;
float r = sqrt (dot(p/Scale,p/Scale));
float a = atan2(p[1], p[0]);
// this moves the pixel
// P[0] -= 1000;
//color col = color(1.0);
color col = ColorBase;
// adding some animation to the eyes
float ss = 0.5 + 0.5*sin(myTime);
float anim = 1.0 + 0.1*ss;
r *= anim;
if( r<0.8 )
{
//col = color(0.0, 0.3, 0.4);
col = ColorEye;
// adding the fbm noise
float f = fbm( 5.0 * p );
col = mix(col, color(0.2, 0.5, 0.4), f);
// adding glow yellow area?
f = 1 - smoothstep(0.2, 0.5, r);
//col = mix(col, color(0.9, 0.6, 0.2), f);
col = mix(col, ColorGlow, f);
// crazy wavy modulation
a += 0.1 * fbm ( 20.0*p );
// adding white fiber
f = smoothstep(0.3, 1.0, fbm( vector( 6.0*r, 20.0*a, 0.0 ) ) ); // changing contrast
col = mix(col, color(1.0), f);
// adding black fiber
f = smoothstep( 0.4, 0.9, fbm( vector( 10.0*r, 15.0*a, 0.0) ) );
col *= 1.0 - 0.9*f;
// multiplying with black on the edge
f = smoothstep( 0.6, 0.8, r);
col *= 1.0 - 0.8*f;
// adding dark circle to the center of the eyes = PUPIL
f = smoothstep(0.2, 0.25, r/PupilSize);
col *= f;
// fake reflection, the glint in the eye
f = 1.0 - smoothstep( GlintMin, GlintMax, length( p-vector(GlintPosX,GlintPosY,0.0)) );
col += color(1.0, 0.9, 0.8) * f * 0.9;
// the edge was too antialias, so added this blur on the eye edge
f = smoothstep(0.7, 0.8, r);
//col = mix(col, color(1.0), f);
col = mix(col, ColorBase, f);
}
ColOut = col;
}
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| Suzanne with procedural OSL Pixar Eyes. |
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