T60748 Second try to fix start extreme in Noise modifier

The first point was moving inverted because first vector was inverted. Now, the vector is changed for the first point to get the same direction.

1 files changed, 6 insertions, 1 deletions

diff --git a/source/blender/gpencil_modifiers/intern/MOD_gpencilnoise.c b/source/blender/gpencil_modifiers/intern/MOD_gpencilnoise.c
index 94f83f10fb5..8b3752c8028 100644
--- a/source/blender/gpencil_modifiers/intern/MOD_gpencilnoise.c
+++ b/source/blender/gpencil_modifiers/intern/MOD_gpencilnoise.c
@@ -170,7 +170,12 @@ static void deformStroke(
 		}
 
 		/* initial vector (p0 -> p1) */
-		sub_v3_v3v3(vec1, &pt1->x, &pt0->x);
+		if (i == 0) {
+			sub_v3_v3v3(vec1, &pt0->x, &pt1->x);
+		}
+		else {
+			sub_v3_v3v3(vec1, &pt1->x, &pt0->x);
+		}
 		vran = len_v3(vec1);
 		/* vector orthogonal to normal */
 		cross_v3_v3v3(vec2, vec1, normal);