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whaison/Cornell.osl

Last active Feb 12, 2017
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Cornell.osl || Open Shading Language || http://thhube.github.io/tutorials/osl/osl.html
// -- Cornell.osl - Generate the Cornell box material ---------------
#include "stdosl.h"
#define POS_Y normal(0.0, 1.0, 0.0)
#define NEG_Y normal(0.0, -1.0, 0.0)
#define EPSILON 1e-5
surface Cornell(output closure color bsdf = 0)
{
color result = color(0, 1, 0);
if (dot(N, POS_Y) < EPSILON) {
result = color(1, 0, 0);
}
if (fabs(dot(N, NEG_Y)) < EPSILON) {
result = color(1, 1, 1);
}
bsdf = result * diffuse(N);
}
// -- Glass.osl - Generate the glass material on Suzanne ------------
#include "stdosl.h"
#define IOR_THRESHOLD 1.000001
float FresnelDielectric(vector i, normal n, float eta)
{
float c = fabs(dot(i, n));
float g = eta * eta - 1 + c * c;
float result = 1.0;
if (g > 0) {
g = sqrt(g);
float a = (g - c) / (g + c);
float b = (c * (g + c) - 1) / (c * (g + c) + 1);
result = 0.5 * a * a * (1 + b * b);
}
return result;
}
surface Glass(
color diffuse_col = 0.8,
float ior = 1.45,
output closure color bsdf = 0)
{
float real_ior = max(ior, IOR_THRESHOLD);
float eta = backfacing()? 1.0 / real_ior : real_ior;
float fr = FresnelDielectric(I, N, eta);
bsdf = diffuse_col * (fr * reflection(N) + (1.0 - fr) * refraction(N, eta));
}
// -- Metal.osl - Generate the metal reflection ---------------------
#include "stdosl.h"
surface Metal(
color diffuse_col = 0.8,
float roughness = 1.5,
output closure color bsdf = 0)
{
bsdf = diffuse_col * reflection(N);
}
// -- Velvet.osl - Generate the velvet surface ----------------------
#include "stdosl.h"
surface Metal(
color diffuse_col = 0.8,
float roughness = 1.5,
output closure color bsdf = 0)
{
bsdf = diffuse_col * reflection(N);
}
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