Fix wrong default value for Lacunarity in Musgrave texture

Lacunarity parameter determines scaling of subsequent octaves in fractal
noises. For example, Noise node have this scaling hardcoded to 2.0. Each
octave have twice bigger scale than previous one, resulting in finer details.

By design fractal noises that generate octaves with same seed should not
have Lacunarity set to 1.0, since then it just stacks up identical noises.

Differential Revision: https://developer.blender.org/D6742

2 files changed, 2 insertions, 2 deletions

diff --git a/intern/cycles/kernel/shaders/node_musgrave_texture.osl b/intern/cycles/kernel/shaders/node_musgrave_texture.osl
index 8861f9a671a..d23ecfd4a31 100644
--- a/intern/cycles/kernel/shaders/node_musgrave_texture.osl
+++ b/intern/cycles/kernel/shaders/node_musgrave_texture.osl
@@ -691,7 +691,7 @@ shader node_musgrave_texture(
     float Dimension = 2.0,
     float Scale = 5.0,
     float Detail = 2.0,
-    float Lacunarity = 1.0,
+    float Lacunarity = 2.0,
     float Offset = 0.0,
     float Gain = 1.0,
     output float Fac = 0.0)
diff --git a/intern/cycles/render/nodes.cpp b/intern/cycles/render/nodes.cpp
index e4339b40744..c241c7b0df0 100644
--- a/intern/cycles/render/nodes.cpp
+++ b/intern/cycles/render/nodes.cpp
@@ -1347,7 +1347,7 @@ NODE_DEFINE(MusgraveTextureNode)
   SOCKET_IN_FLOAT(scale, "Scale", 1.0f);
   SOCKET_IN_FLOAT(detail, "Detail", 2.0f);
   SOCKET_IN_FLOAT(dimension, "Dimension", 2.0f);
-  SOCKET_IN_FLOAT(lacunarity, "Lacunarity", 1.0f);
+  SOCKET_IN_FLOAT(lacunarity, "Lacunarity", 2.0f);
   SOCKET_IN_FLOAT(offset, "Offset", 0.0f);
   SOCKET_IN_FLOAT(gain, "Gain", 1.0f);