GPencil: Curvature support for length modifier

Extend the stroke following an approximated circluar/helical curve.

This can be used as an effect for lineart or on its own as helix generator.

Reviewed By: Sebastian Parborg (zeddb), Hans Goudey (HooglyBoogly), YimingWu (NicksBest), Antonio Vazquez (antoniov), Henrik Dick (weasel)

Differential Revision: https://developer.blender.org/D11668

# 请为您的变更输入提交说明。以 '#' 开始的行将被忽略，而一个空的提交
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# 位于分支 master
# 您的分支与上游分支 'origin/master' 一致。
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# 要提交的变更：
#	修改：     source/blender/blenkernel/BKE_gpencil_geom.h
#	修改：     source/blender/blenkernel/intern/gpencil_geom.cc
#	修改：     source/blender/gpencil_modifiers/intern/MOD_gpencillength.c
#	修改：     source/blender/makesdna/DNA_gpencil_modifier_defaults.h
#	修改：     source/blender/makesdna/DNA_gpencil_modifier_types.h
#	修改：     source/blender/makesrna/intern/rna_gpencil_modifier.c
#

1 files changed, 6 insertions, 1 deletions

diff --git a/source/blender/makesdna/DNA_gpencil_modifier_types.h b/source/blender/makesdna/DNA_gpencil_modifier_types.h
index d3429329ef6..43469fbb46b 100644
--- a/source/blender/makesdna/DNA_gpencil_modifier_types.h
+++ b/source/blender/makesdna/DNA_gpencil_modifier_types.h
@@ -493,7 +493,10 @@ typedef struct LengthGpencilModifierData {
   float overshoot_fac;
   /** Modifier mode. */
   int mode;
-  char _pad[4];
+  /* Curvature parameters. */
+  float point_density;
+  float segment_influence;
+  float max_angle;
 } LengthGpencilModifierData;
 
 typedef enum eLengthGpencil_Flag {
@@ -501,6 +504,8 @@ typedef enum eLengthGpencil_Flag {
   GP_LENGTH_INVERT_PASS = (1 << 1),
   GP_LENGTH_INVERT_LAYERPASS = (1 << 2),
   GP_LENGTH_INVERT_MATERIAL = (1 << 3),
+  GP_LENGTH_USE_CURVATURE = (1 << 4),
+  GP_LENGTH_INVERT_CURVATURE = (1 << 5),
 } eLengthGpencil_Flag;
 
 typedef enum eLengthGpencil_Type {