From 095a01a73a35d3af57573fc724d381bcca019f54 Mon Sep 17 00:00:00 2001 From: Brecht Van Lommel Date: Thu, 14 Sep 2017 22:56:32 +0200 Subject: Cycles: slightly improve BSDF sample stratification for path tracing. Similar to what we did for area lights previously, this should help preserve stratification when using multiple BSDFs in theory. Improvements are not easily noticeable in practice though, because the number of BSDFs is usually low. Still nice to eliminate one sampling dimension. --- intern/cycles/kernel/split/kernel_subsurface_scatter.h | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) (limited to 'intern/cycles/kernel/split/kernel_subsurface_scatter.h') diff --git a/intern/cycles/kernel/split/kernel_subsurface_scatter.h b/intern/cycles/kernel/split/kernel_subsurface_scatter.h index 6caa18518dd..3b957856aea 100644 --- a/intern/cycles/kernel/split/kernel_subsurface_scatter.h +++ b/intern/cycles/kernel/split/kernel_subsurface_scatter.h @@ -250,16 +250,17 @@ ccl_device void kernel_subsurface_scatter(KernelGlobals *kg) #ifdef __BRANCHED_PATH__ } else if(IS_FLAG(ray_state, ray_index, RAY_BRANCHED_INDIRECT)) { - const ShaderClosure *sc = shader_bssrdf_pick(sd, throughput); + float bssrdf_u, bssrdf_v; + path_state_rng_2D(kg, + state, + PRNG_BSDF_U, + &bssrdf_u, &bssrdf_v); + + const ShaderClosure *sc = shader_bssrdf_pick(sd, throughput, &bssrdf_u); /* do bssrdf scatter step if we picked a bssrdf closure */ if(sc) { uint lcg_state = lcg_state_init_addrspace(state, 0x68bc21eb); - float bssrdf_u, bssrdf_v; - path_state_rng_2D(kg, - state, - PRNG_BSDF_U, - &bssrdf_u, &bssrdf_v); subsurface_scatter_step(kg, sd, state, -- cgit v1.2.3