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Fix T47356: Too sharp falloww with Burley BSSRDF

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After the clamping commit we need to bump BURLEY_TRUNCATE
constant a bit, otherwise mean free path does not really
match the disk radius needed for importance sampling.
This commit is contained in:
Sergey Sharybin
2016-02-08 14:51:57 +01:00
parent 52668c56b7
commit dae8326d1e
1 changed files with 1 additions and 1 deletions
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2
intern/cycles/kernel/closure/bssrdf.h
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@@ -181,7 +181,7 @@ ccl_device void bssrdf_cubic_sample(ShaderClosure *sc, float xi, float *r, float
* the mean free length, but still not too big so sampling is still * the mean free length, but still not too big so sampling is still
* effective. Might need some further tweaks. * effective. Might need some further tweaks.
*/ */
#define BURLEY_TRUNCATE 10.0f #define BURLEY_TRUNCATE 30.0f
#define BURLEY_TRUNCATE_CDF 0.973233f // cdf(BURLEY_TRUNCATE) #define BURLEY_TRUNCATE_CDF 0.973233f // cdf(BURLEY_TRUNCATE)
ccl_device_inline float bssrdf_burley_fitting(float A) ccl_device_inline float bssrdf_burley_fitting(float A)