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Cycles: Added support for light portals

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This patch adds support for light portals: objects that help sampling the
environment light, therefore improving convergence. Using them tor other
lights in a unidirectional pathtracer is virtually useless.

The sampling is done with the area-preserving code already used for area lamps.
MIS is used both for combination of different portals and for combining portal-
and envmap-sampling.

The direction of portals is considered, they aren't used if the sampling point
is behind them.

Reviewers: sergey, dingto, #cycles

Reviewed By: dingto, #cycles

Subscribers: Lapineige, nutel, jtheninja, dsisco11, januz, vitorbalbio, candreacchio, TARDISMaker, lichtwerk, ace_dragon, marcog, mib2berlin, Tunge, lopataasdf, lordodin, sergey, dingto

Differential Revision: https://developer.blender.org/D1133
This commit is contained in:
Lukas Stockner
2015-04-28 00:51:55 +05:00
committed by Sergey Sharybin
parent 84836e8952
commit f478c2cfbd
9 changed files with 540 additions and 213 deletions
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2
intern/cycles/kernel/kernel_emission.h
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@@ -254,7 +254,7 @@ ccl_device_noinline float3 indirect_background(KernelGlobals *kg, PathState *sta
if(!(state->flag & PATH_RAY_MIS_SKIP) && res) {
/* multiple importance sampling, get background light pdf for ray
* direction, and compute weight with respect to BSDF pdf */
float pdf = background_light_pdf(kg, ray->D);
float pdf = background_light_pdf(kg, ray->P, ray->D);
float mis_weight = power_heuristic(state->ray_pdf, pdf);
return L*mis_weight;