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Fix wrong roughness in Principled Hair Huang trrt+ component

This commit is contained in:
Weizhen Huang 2024-02-22 12:07:35 +01:00
parent 63613e431e
commit 65d910aef7
1 changed files with 2 additions and 2 deletions
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4
intern/cycles/kernel/closure/bsdf_principled_hair_huang.h
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@ -760,8 +760,8 @@ ccl_device int bsdf_hair_huang_sample(const KernelGlobals kg,
/* Sample `theta_o`. */
const float rand_theta = max(lcg_step_float(&sd->lcg_state), 1e-5f);
const float fac = 1.0f +
bsdf->roughness *
logf(rand_theta + (1.0f - rand_theta) * expf(-2.0f / bsdf->roughness));
4.0f * bsdf->roughness *
logf(rand_theta + (1.0f - rand_theta) * expf(-0.5f / bsdf->roughness));
const float sin_theta_o = -fac * sin_theta(wi) +
cos_from_sin(fac) *
cosf(M_2PI_F * lcg_step_float(&sd->lcg_state)) * cos_theta(wi);