scripts-blender/addons/brushstroke_tools/settings.py

@@ -40,6 +40,14 @@ def update_context_material(self, context):
     if not style_object:
         return
     utils.set_brushstroke_material(style_object, self.context_material)
+    ng = bpy.data.node_groups.get(f'BSBST-BS.{self.context_material.brush_style}')
+    if not ng:
+        utils.set_preview(None)
+        return
+    if ng.preview:
+        utils.set_preview(ng.preview.image_pixels_float, ng.preview.image_size[:], ng.name)
+    else:
+        utils.set_preview(None)
 
 def update_link_context_type(self, context):
     self.link_context = True
@@ -134,11 +142,10 @@ def set_brush_style(self, value):
     ng_name = f'BSBST-BS.{value}'
     ng = utils.ensure_node_group(ng_name, [bs for bs in addon_prefs.brush_styles if bs.name==value][0].filepath)
 
-    if utils.compare_versions(bpy.app.version, (4,2,4)) >= 0:
-        if ng.preview:
-            utils.set_preview(ng.preview.image_pixels_float, ng.preview.image_size[:])
-        else:
-            utils.set_preview(None)
+    if ng.preview:
+        utils.set_preview(ng.preview.image_pixels_float, ng.preview.image_size[:], ng.name)
+    else:
+        utils.set_preview(None)
 
     node = self.node_tree.nodes['Brush Style']
     node_prev_inputs = [input.name for input in node.inputs]

scripts-blender/addons/brushstroke_tools/utils.py

@@ -6,6 +6,8 @@ from bpy.app.handlers import persistent
 
 addon_version = (0,0,0)
 
+preview_name = '.BSBST-preview'
+
 ng_list = [
     ".brushstroke_tools.draw_processing",
     ".brushstroke_tools.pre_processing",
@@ -587,17 +589,23 @@ def round_n(val, n):
     """
     return round(val, n-int(math.floor(math.log10(abs(val))))-1)
 
-def set_preview(pixels, size = (256, 256)):
-    preview_name = '.BSBST-preview'
+def clear_preview():
     preview_img = bpy.data.images.get(preview_name)
     preview_texture = bpy.data.textures.get(preview_name)
-    if not pixels:
-        if preview_img:
-            bpy.data.images.remove(preview_img)
-        if preview_texture:
-            bpy.data.textures.remove(preview_texture)
+    if preview_img:
+        bpy.data.images.remove(preview_img)
+    if preview_texture:
+        bpy.data.textures.remove(preview_texture)
+
+def set_preview(pixels, size = (256, 256), id=''):
+    preview_img = bpy.data.images.get(preview_name)
+    preview_texture = bpy.data.textures.get(preview_name)
+    if not pixels or compare_versions(bpy.app.version, (4,2,4)) < 0:
+        clear_preview()
         return
     if preview_img:
+        if id and id == preview_img['BSBST-id']:
+            return
         if not len(preview_img.pixels) == len(pixels):
             bpy.data.images.remove(preview_img)
             preview_img = None
@@ -613,6 +621,7 @@ def set_preview(pixels, size = (256, 256)):
     preview_texture.image = preview_img
     
     preview_img.pixels.foreach_set(numpy.array(pixels, dtype=numpy.float32))
+    preview_img['BSBST-id'] = id
 
     preview_img.pack()