loop in and out

__init__.py

@@ -242,6 +242,18 @@ class ABC3D_text_properties(bpy.types.PropertyGroup):
         name="Ignore Curve Orientation",
         default=False,
     )
+    loop_in: bpy.props.BoolProperty(
+        update=update_callback,
+        name="Loop In",
+        description="Loop letter on curve if negative offset would place it in front of it.",
+        default=False,
+    )
+    loop_out: bpy.props.BoolProperty(
+        update=update_callback,
+        name="Loop Out",
+        description="Loop letter on curve if a large offset would place it behind it.",
+        default=False,
+    )
     distribution_type: bpy.props.StringProperty()
     glyphs: bpy.props.CollectionProperty(type=ABC3D_glyph_properties)
 
@@ -809,6 +821,8 @@ class ABC3D_PT_TextPropertiesPanel(bpy.types.Panel):
         layout.row().prop(props, "offset")
         layout.row().prop(props, "compensate_curvature")
         layout.row().prop(props, "ignore_orientation")
+        layout.row().prop(props, "loop_in")
+        layout.row().prop(props, "loop_out")
         layout.column().prop(props, "translation")
         layout.column().prop(props, "orientation")
 

butils.py

@@ -1014,11 +1014,21 @@ def set_text_on_curve(text_properties, reset_timeout_s=0.1, reset_depsgraph_n=4)
         glyph_pre_advance, glyph_post_advance = get_glyph_prepost_advances(glyph)
         advance += glyph_pre_advance * scalor
 
+        # check if we want to loop
+        applied_advance = advance
+        if text_properties.loop_in:
+            if applied_advance < 0:
+                applied_advance %= curve_length
+
+        if text_properties.loop_out:
+            if applied_advance > curve_length:
+                applied_advance %= curve_length
+
         if distribution_type == "FOLLOW_PATH":
             outer_node.constraints.new(type="FOLLOW_PATH")
             outer_node.constraints["Follow Path"].target = mom
             outer_node.constraints["Follow Path"].use_fixed_location = True
-            outer_node.constraints["Follow Path"].offset_factor = advance / curve_length
+            outer_node.constraints["Follow Path"].offset_factor = applied_advance / curve_length
             outer_node.constraints["Follow Path"].use_curve_follow = True
             outer_node.constraints["Follow Path"].forward_axis = "FORWARD_X"
             outer_node.constraints["Follow Path"].up_axis = "UP_Y"
@@ -1034,7 +1044,7 @@ def set_text_on_curve(text_properties, reset_timeout_s=0.1, reset_depsgraph_n=4)
                 previous_inner_node_rotation_mode = inner_node.rotation_mode
 
             # get info from bezier
-            location, tangent, spline_index = calc_point_on_bezier_curve(mom, advance, True, True)
+            location, tangent, spline_index = calc_point_on_bezier_curve(mom, applied_advance, True, True)
 
             # check if we are on a new line
             if spline_index != previous_spline_index: