Shading: add Roughness input to Noise and Wave texture nodes

Currently in fractal_noise functions, each subsequent octave doubles the
frequency and reduces the amplitude by half. This patch introduces Roughness
input to Noise and Wave nodes. This multiplier determines how quickly the
amplitudes of the subsequent octaves decrease.

Value of 0.5 will be the default, generating identical noise we had before.
Values above 0.5 will increase influence of each octave resulting in more
"rough" noise, most interesting pattern changes happen there. Values below
0.5 will result in more "smooth" noise.

Differential Revision: https://developer.blender.org/D7065

1 files changed, 2 insertions, 2 deletions

diff --git a/intern/cycles/render/nodes.h b/intern/cycles/render/nodes.h
index e201118574b..8316fa3cf9b 100644
--- a/intern/cycles/render/nodes.h
+++ b/intern/cycles/render/nodes.h
@@ -230,7 +230,7 @@ class NoiseTextureNode : public TextureNode {
   SHADER_NODE_CLASS(NoiseTextureNode)
 
   int dimensions;
-  float w, scale, detail, distortion;
+  float w, scale, detail, roughness, distortion;
   float3 vector;
 };
 
@@ -291,7 +291,7 @@ class WaveTextureNode : public TextureNode {
   NodeWaveRingsDirection rings_direction;
   NodeWaveProfile profile;
 
-  float scale, distortion, detail, detail_scale, phase;
+  float scale, distortion, detail, detail_scale, detail_roughness, phase;
   float3 vector;
 };