Cycles: remove old Sobol pattern, simplify sampling dimensions

The multi-dimensional Sobol pattern required us to carefully use as low
dimensions as possible, as quality goes down in higher dimensions. Now that we
have two sampling patterns that are at least as good, there is no need to keep
it around and the implementation can be simplified.

Differential Revision: https://developer.blender.org/D15788

2 files changed, 3 insertions, 2 deletions

diff --git a/intern/cycles/kernel/svm/ao.h b/intern/cycles/kernel/svm/ao.h
index c57c68d6230..a3808eff6dd 100644
--- a/intern/cycles/kernel/svm/ao.h
+++ b/intern/cycles/kernel/svm/ao.h
@@ -50,7 +50,7 @@ ccl_device float svm_ao(
   int unoccluded = 0;
   for (int sample = 0; sample < num_samples; sample++) {
     float disk_u, disk_v;
-    path_branched_rng_2D(kg, &rng_state, sample, num_samples, PRNG_BEVEL_U, &disk_u, &disk_v);
+    path_branched_rng_2D(kg, &rng_state, sample, num_samples, PRNG_SURFACE_AO, &disk_u, &disk_v);
 
     float2 d = concentric_sample_disk(disk_u, disk_v);
     float3 D = make_float3(d.x, d.y, safe_sqrtf(1.0f - dot(d, d)));
diff --git a/intern/cycles/kernel/svm/bevel.h b/intern/cycles/kernel/svm/bevel.h
index 4617a056a52..f9d3f6c850f 100644
--- a/intern/cycles/kernel/svm/bevel.h
+++ b/intern/cycles/kernel/svm/bevel.h
@@ -129,7 +129,8 @@ ccl_device float3 svm_bevel(
 
   for (int sample = 0; sample < num_samples; sample++) {
     float disk_u, disk_v;
-    path_branched_rng_2D(kg, &rng_state, sample, num_samples, PRNG_BEVEL_U, &disk_u, &disk_v);
+    path_branched_rng_2D(
+        kg, &rng_state, sample, num_samples, PRNG_SURFACE_BEVEL, &disk_u, &disk_v);
 
     /* Pick random axis in local frame and point on disk. */
     float3 disk_N, disk_T, disk_B;