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Diffstat (limited to 'intern/cycles/kernel/shaders/node_fresnel.h')
-rw-r--r--intern/cycles/kernel/shaders/node_fresnel.h44
1 files changed, 21 insertions, 23 deletions
diff --git a/intern/cycles/kernel/shaders/node_fresnel.h b/intern/cycles/kernel/shaders/node_fresnel.h
index 40793479d8a..ade1d4c6207 100644
--- a/intern/cycles/kernel/shaders/node_fresnel.h
+++ b/intern/cycles/kernel/shaders/node_fresnel.h
@@ -32,33 +32,31 @@
float fresnel_dielectric_cos(float cosi, float eta)
{
- /* compute fresnel reflectance without explicitly computing
- * the refracted direction */
- float c = fabs(cosi);
- float g = eta * eta - 1 + c * c;
- float result;
+ /* compute fresnel reflectance without explicitly computing
+ * the refracted direction */
+ float c = fabs(cosi);
+ float g = eta * eta - 1 + c * c;
+ float result;
- 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);
- }
- else
- result = 1.0; /* TIR (no refracted component) */
+ 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);
+ }
+ else
+ result = 1.0; /* TIR (no refracted component) */
- return result;
+ return result;
}
color fresnel_conductor(float cosi, color eta, color k)
{
- color cosi2 = color(cosi * cosi);
- color one = color(1, 1, 1);
- color tmp_f = eta * eta + k * k;
- color tmp = tmp_f * cosi2;
- color Rparl2 = (tmp - (2.0 * eta * cosi) + one) /
- (tmp + (2.0 * eta * cosi) + one);
- color Rperp2 = (tmp_f - (2.0 * eta * cosi) + cosi2) /
- (tmp_f + (2.0 * eta * cosi) + cosi2);
- return (Rparl2 + Rperp2) * 0.5;
+ color cosi2 = color(cosi * cosi);
+ color one = color(1, 1, 1);
+ color tmp_f = eta * eta + k * k;
+ color tmp = tmp_f * cosi2;
+ color Rparl2 = (tmp - (2.0 * eta * cosi) + one) / (tmp + (2.0 * eta * cosi) + one);
+ color Rperp2 = (tmp_f - (2.0 * eta * cosi) + cosi2) / (tmp_f + (2.0 * eta * cosi) + cosi2);
+ return (Rparl2 + Rperp2) * 0.5;
}