Added Texel Density Unit Scale in preferences

Allows to adjust the system unit scale to a custom unit by a multiplier for the texel density, so it is shown and managed in that custom unit (e.g., pixels per centimeter when the system unit is meters); the setting can be found in the add-on preferences. Fixes #146

__init__.py

@@ -2,7 +2,7 @@
 	"name": "TexTools",
 	"description": "Professional UV and Texture tools for Blender.",
 	"author": "renderhjs, franMarz, Sav Martin",
-	"version": (1, 5),
+	"version": (1, 6),
 	"blender": (2, 80, 0),
 	"category": "UV",
 	"location": "UV Image Editor > Tools > 'TexTools' panel"
@@ -251,6 +251,7 @@ class Panel_Preferences(AddonPreferences):
 	bool_clean_transmission : BoolProperty(name="Ignore other channels when baking Transmission", default=False)
 	bool_modifier_auto_high : BoolProperty(name="Detect Objects with Subdiv or Bevel Mods as a Highpoly pair for baking", default=True)
 	bool_help : BoolProperty(name="Show help buttons on panels", default=True)
+	texel_density_scale: FloatProperty(name="Texel Density Unit Scale", description="Multiplier for scaling the System Units when working with Texel Density values", default=1, min=0.00000000001)
 
 
 	def draw(self, context):
@@ -313,8 +314,12 @@ def draw(self, context):
 		box.separator()
 		col = box.column(align=True)
 		col.prop(self, "bool_help", icon='INFO')
-
-
+
+		box.separator()
+		col = box.column(align=True)
+		col.prop(self, "texel_density_scale", icon='UV_DATA')
+
+
 		if not hasattr(bpy.types,"ShaderNodeBevel"):
 			box.separator()
 			col = box.column(align=True)
@@ -704,10 +709,9 @@ def set_bake_color_space(self, value):
 	)
 	texel_density : FloatProperty(
 		name = "Texel",
-		description = "Texel size or Pixels per 1 unit ratio",
+		description = "Texel size or Pixels per unit ratio",
 		default = 256,
 		min = 0.0
-		# max = 100.00
 	)
 	meshtexture_wrap : FloatProperty(
 		name = "Wrap",

op_texel_density_get.py

@@ -44,7 +44,7 @@ def execute(self, context):
 			sum_area_vt += area_pair[1]
 
 		if sum_area_uv != 0 and sum_area_vt != 0:
-			bpy.context.scene.texToolsSettings.texel_density = sum_area_uv / sum_area_vt
+			bpy.context.scene.texToolsSettings.texel_density = (sum_area_uv / sum_area_vt) * bpy.context.preferences.addons[__package__].preferences.texel_density_scale
 
 		if not edit_mode:
 			bpy.ops.object.mode_set(mode='OBJECT')

op_texel_density_set.py

@@ -170,7 +170,7 @@ def set_texel_density(self, context, edit_mode, getmode, setmode, density, udim_
 				else:
 					if udim_tile != 1001:
 						pre_center = Vector((column, row))
-				scale = density / (sum_area_uv / sum_area_vt)
+				scale = (density / (sum_area_uv / sum_area_vt)) / bpy.context.preferences.addons[__package__].preferences.texel_density_scale
 
 			if scale != 1:
 				if setmode == 'ISLAND' or udim_tile != 1001: