diff options
Diffstat (limited to 'intern/cycles/kernel/kernel_random.h')
| -rw-r--r-- | intern/cycles/kernel/kernel_random.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/intern/cycles/kernel/kernel_random.h b/intern/cycles/kernel/kernel_random.h index 31cb6ff6abd..ac04b3168a1 100644 --- a/intern/cycles/kernel/kernel_random.h +++ b/intern/cycles/kernel/kernel_random.h @@ -266,6 +266,19 @@ ccl_device_inline float path_state_rng_1D(KernelGlobals *kg, RNG *rng, PathState return path_rng_1D(kg, rng, state->sample, state->num_samples, state->rng_offset + dimension); } +ccl_device_inline float path_state_rng_1D_for_decision(KernelGlobals *kg, RNG *rng, PathState *state, int dimension) +{ + /* the rng_offset is not increased for transparent bounces. if we do then + * fully transparent objects can become subtly visible by the different + * sampling patterns used where the transparent object is. + * + * however for some random numbers that will determine if we next bounce + * is transparent we do need to increase the offset to avoid always making + * the same decision */ + int rng_offset = state->rng_offset + state->transparent_bounce*PRNG_BOUNCE_NUM; + return path_rng_1D(kg, rng, state->sample, state->num_samples, rng_offset + dimension); +} + ccl_device_inline void path_state_rng_2D(KernelGlobals *kg, RNG *rng, PathState *state, int dimension, float *fx, float *fy) { path_rng_2D(kg, rng, state->sample, state->num_samples, state->rng_offset + dimension, fx, fy); |