Commit: 3232d8ec8f15ad00ff16fd4326258de0b0b83486
Author: Brecht Van Lommel
Date: Sun Jul 2 21:53:23 2017 +0200
Branches: master
https://developer.blender.org/rB3232d8ec8f15ad00ff16fd4326258de0b0b83486
Fix T51951: cell noise texture precision issue at unit vertex coordinates.
Solution is to bias the coordinates a little, same as Cycles checker texture.
===================================================================
M source/blender/blenlib/intern/noise.c
===================================================================
diff --git a/source/blender/blenlib/intern/noise.c
b/source/blender/blenlib/intern/noise.c
index f834c5b4c74..347640aae0d 100644
--- a/source/blender/blenlib/intern/noise.c
+++ b/source/blender/blenlib/intern/noise.c
@@ -1394,6 +1394,11 @@ static float voronoi_CrS(float x, float y, float z)
/* returns unsigned cellnoise */
static float cellNoiseU(float x, float y, float z)
{
+ /* avoid precision issues on unit coordinates */
+ x = (x + 0.000001f)*0.999999f;
+ y = (y + 0.000001f)*0.999999f;
+ z = (z + 0.000001f)*0.999999f;
+
int xi = (int)(floor(x));
int yi = (int)(floor(y));
int zi = (int)(floor(z));
@@ -1411,6 +1416,11 @@ float cellNoise(float x, float y, float z)
/* returns a vector/point/color in ca, using point hasharray directly */
void cellNoiseV(float x, float y, float z, float ca[3])
{
+ /* avoid precision issues on unit coordinates */
+ x = (x + 0.000001f)*0.999999f;
+ y = (y + 0.000001f)*0.999999f;
+ z = (z + 0.000001f)*0.999999f;
+
int xi = (int)(floor(x));
int yi = (int)(floor(y));
int zi = (int)(floor(z));
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