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GPencil: Improve Thickness handling for Outline operator

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Actually, when you increase the thickness of the stroke in the outline conversion, the shape of the stroke changes and becomes thicker.

This commit includes a new algorithm to correct this problem. A new `Keep Shape`  parameter allows you to disable it because, for artist reasons, it may be good to keep the old algorithm and change the shape.
This commit is contained in:
Antonio Vazquez
2022-08-30 17:03:13 +02:00
parent 9cfa74087e
commit 38cf0d7d13
7 changed files with 27 additions and 10 deletions
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3
source/blender/blenkernel/BKE_gpencil_geom.h
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@@ -488,7 +488,8 @@ struct bGPDstroke *BKE_gpencil_stroke_perimeter_from_view(struct RegionView3D *r
const struct bGPDlayer *gpl,
struct bGPDstroke *gps,
int subdivisions,
const float diff_mat[4][4]);
const float diff_mat[4][4],
const float thickness_chg);
/**
* Get average pressure.
*/

8
source/blender/blenkernel/intern/gpencil_geom.cc
View File

@@ -3960,6 +3960,7 @@ static ListBase *gpencil_stroke_perimeter_ex(const bGPdata *gpd,
const bGPDlayer *gpl,
const bGPDstroke *gps,
int subdivisions,
const float thickness_chg,
int *r_num_perimeter_points)
{
/* sanity check */
@@ -3968,7 +3969,9 @@ static ListBase *gpencil_stroke_perimeter_ex(const bGPdata *gpd,
}
float defaultpixsize = 1000.0f / gpd->pixfactor;
float ovr_radius = thickness_chg / defaultpixsize / 2.0f;
float stroke_radius = ((gps->thickness + gpl->line_change) / defaultpixsize) / 2.0f;
stroke_radius = max_ff(stroke_radius - ovr_radius, 0.0f);
ListBase *perimeter_right_side = MEM_cnew<ListBase>(__func__);
ListBase *perimeter_left_side = MEM_cnew<ListBase>(__func__);
@@ -4202,7 +4205,8 @@ bGPDstroke *BKE_gpencil_stroke_perimeter_from_view(struct RegionView3D *rv3d,
const bGPDlayer *gpl,
bGPDstroke *gps,
const int subdivisions,
const float diff_mat[4][4])
const float diff_mat[4][4],
const float thickness_chg)
{
if (gps->totpoints == 0) {
return nullptr;
@@ -4234,7 +4238,7 @@ bGPDstroke *BKE_gpencil_stroke_perimeter_from_view(struct RegionView3D *rv3d,
BKE_gpencil_stroke_to_view_space(rv3d, gps_temp, diff_mat);
int num_perimeter_points = 0;
ListBase *perimeter_points = gpencil_stroke_perimeter_ex(
gpd, gpl, gps_temp, subdivisions, &num_perimeter_points);
gpd, gpl, gps_temp, subdivisions, thickness_chg, &num_perimeter_points);
if (num_perimeter_points == 0) {
return nullptr;