GPencil: Add new parameteres to transform layers

When using grease pencil for drawing Storyboards, it's very common to require a transform of the layers. This transform can be done using the offset modifier, but in some cases, the scene requires a lot of modifiers and makes the file hard to work.

This new feature adds a transforms Location, Rotation and Scale at Layer level, and allows to transform the layer without using a modifier, keeping the scene more clean.

{F9480695}

This feature was suggested by @pepeland after receiving feedback from several artists.

Also, done some code cleanup and rename some functions to get a better naming.

Maniphest Tasks: T83660

Differential Revision: https://developer.blender.org/D9761

1 files changed, 7 insertions, 3 deletions

diff --git a/source/blender/editors/gpencil/gpencil_primitive.c b/source/blender/editors/gpencil/gpencil_primitive.c
index b457cd819d2..99242e48cc1 100644
--- a/source/blender/editors/gpencil/gpencil_primitive.c
+++ b/source/blender/editors/gpencil/gpencil_primitive.c
@@ -317,6 +317,10 @@ static void gpencil_primitive_set_initdata(bContext *C, tGPDprimitive *tgpi)
   }
   tgpi->gpl = gpl;
 
+  /* Recalculate layer transform matrix to avoid problems if props are animated. */
+  loc_eul_size_to_mat4(gpl->layer_mat, gpl->location, gpl->rotation, gpl->scale);
+  invert_m4_m4(gpl->layer_invmat, gpl->layer_mat);
+
   /* create a new temporary frame */
   tgpi->gpf = MEM_callocN(sizeof(bGPDframe), "Temp bGPDframe");
   tgpi->gpf->framenum = tgpi->cframe = cfra;
@@ -1004,12 +1008,12 @@ static void gpencil_primitive_update_strokes(bContext *C, tGPDprimitive *tgpi)
       /* reproject current */
       ED_gpencil_tpoint_to_point(tgpi->region, origin, tpt, &spt);
       ED_gpencil_project_point_to_plane(
-          tgpi->scene, tgpi->ob, tgpi->rv3d, origin, tgpi->lock_axis - 1, &spt);
+          tgpi->scene, tgpi->ob, tgpi->gpl, tgpi->rv3d, origin, tgpi->lock_axis - 1, &spt);
 
       /* reproject previous */
       ED_gpencil_tpoint_to_point(tgpi->region, origin, tptb, &spt2);
       ED_gpencil_project_point_to_plane(
-          tgpi->scene, tgpi->ob, tgpi->rv3d, origin, tgpi->lock_axis - 1, &spt2);
+          tgpi->scene, tgpi->ob, tgpi->gpl, tgpi->rv3d, origin, tgpi->lock_axis - 1, &spt2);
       tgpi->totpixlen += len_v3v3(&spt.x, &spt2.x);
       tpt->uv_fac = tgpi->totpixlen;
     }
@@ -1067,7 +1071,7 @@ static void gpencil_primitive_update_strokes(bContext *C, tGPDprimitive *tgpi)
     float origin[3];
     ED_gpencil_drawing_reference_get(tgpi->scene, tgpi->ob, ts->gpencil_v3d_align, origin);
     ED_gpencil_project_stroke_to_plane(
-        tgpi->scene, tgpi->ob, tgpi->rv3d, gps, origin, ts->gp_sculpt.lock_axis - 1);
+        tgpi->scene, tgpi->ob, tgpi->rv3d, tgpi->gpl, gps, origin, ts->gp_sculpt.lock_axis - 1);
   }
 
   /* if parented change position relative to parent object */