Obj import does not import vertex color information #104621

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Koen-Van-Bastelaere · 2023-05-22T15:44:39+02:00

2023-05-22 15:44:39 +02:00

If you do an obj import with a script using bpy.ops.import_scene.obj, the vertex color data is not imported.
If you import via the Blender GUI, the color data is imported

If you do an obj import with a script using bpy.ops.import_scene.obj, the vertex color data is not imported. If you import via the Blender GUI, the color data is imported

Germano Cavalcante commented

2023-05-22 22:19:28 +02:00

This report does not contain all the requested information, which is required for us to investigate the issue.

Please submit a new report and carefully follow the instructions. Be sure to provide system information, Blender version, the last Blender version which worked, and a .blend file with exact steps to reproduce the problem.

A guideline for making a good bug report can be found at https://wiki.blender.org/wiki/Process/Bug_Reports

This report does not contain all the requested information, which is required for us to investigate the issue. Please submit a new report and carefully follow the instructions. Be sure to provide system information, Blender version, the last Blender version which worked, and a .blend file with exact steps to reproduce the problem. A guideline for making a good bug report can be found at https://wiki.blender.org/wiki/Process/Bug_Reports

Germano Cavalcante closed this issue

2023-05-22 22:19:29 +02:00

Blender Bot added the

Status

Archived

label 2023-05-22 22:19:30 +02:00

Koen-Van-Bastelaere commented

2023-05-23 16:32:30 +02:00

If someone would ever like to add the vertex color information for an obj file:
import_obj.py

471
- def split_mesh(verts_loc, faces, unique_materials, filepath, SPLIT_OB_OR_GROUP):
+ def split_mesh(verts_loc, verts_color, faces, unique_materials, filepath, SPLIT_OB_OR_GROUP):

473
-    Takes vert_loc and faces, and separates into multiple sets of
+    Takes vert_loc, verts_color and faces, and separates into multiple sets of

483
-        return [(verts_loc, faces, unique_materials, filename, use_verts_nor, use_verts_tex)]
+        return [(verts_loc, verts_color, faces, unique_materials, filename, use_verts_nor, use_verts_tex)]

512
-            (verts_split, faces_split, unique_materials_split, vert_remap,
-             use_verts_nor, use_verts_tex) = face_split_dict.setdefault(key, ([], [], {}, {}, [], []))
+            (verts_split, verts_color_split, faces_split, unique_materials_split, vert_remap,
+             use_verts_nor, use_verts_tex) = face_split_dict.setdefault(key, ([], [], [], {}, {}, [], []))

530
+                verts_color_split.append(verts_color[vert_idx])

539
-    return [(verts_split, faces_split, unique_materials_split, key_to_name(key), bool(use_vnor), bool(use_vtex))
-            for key, (verts_split, faces_split, unique_materials_split, _, use_vnor, use_vtex)
+    return [(verts_split, verts_color_split, faces_split, unique_materials_split, key_to_name(key), bool(use_vnor), bool(use_vtex))
+            for key, (verts_split, verts_color_split, faces_split, unique_materials_split, _, use_vnor, use_vtex)

547
+                verts_color,

685
+    if verts_color:
+        color_attr = me.color_attributes.new(name='Col', type='FLOAT_COLOR', domain='POINT')
+        color_layer = color_attr.data
+        for vertex_index, vertex in enumerate(me.vertices):
+            color = verts_color[vertex_index]
+            color_layer[vertex_index].color = (*color, 1.0)

949
+        verts_color = []

1035
+                            if line_start == b'v' and len(line_split) > 4:
+                                verts_color.append(list(map(float_func, line_split[4:7])))
+                            else:
+                                verts_color.append((0.0, 0.0, 0.0))

1244
-        for data in split_mesh(verts_loc, faces, unique_materials, filepath, SPLIT_OB_OR_GROUP):
-            verts_loc_split, faces_split, unique_materials_split, dataname, use_vnor, use_vtex = data
+        for data in split_mesh(verts_loc, verts_color, faces, unique_materials, filepath, SPLIT_OB_OR_GROUP):
+            verts_loc_split, verts_color_split, faces_split, unique_materials_split, dataname, use_vnor, use_vtex = data

1251
+                        verts_color_split,

If someone would ever like to add the vertex color information for an obj file: import_obj.py ``` 471 - def split_mesh(verts_loc, faces, unique_materials, filepath, SPLIT_OB_OR_GROUP): + def split_mesh(verts_loc, verts_color, faces, unique_materials, filepath, SPLIT_OB_OR_GROUP): 473 - Takes vert_loc and faces, and separates into multiple sets of + Takes vert_loc, verts_color and faces, and separates into multiple sets of 483 - return [(verts_loc, faces, unique_materials, filename, use_verts_nor, use_verts_tex)] + return [(verts_loc, verts_color, faces, unique_materials, filename, use_verts_nor, use_verts_tex)] 512 - (verts_split, faces_split, unique_materials_split, vert_remap, - use_verts_nor, use_verts_tex) = face_split_dict.setdefault(key, ([], [], {}, {}, [], [])) + (verts_split, verts_color_split, faces_split, unique_materials_split, vert_remap, + use_verts_nor, use_verts_tex) = face_split_dict.setdefault(key, ([], [], [], {}, {}, [], [])) 530 + verts_color_split.append(verts_color[vert_idx]) 539 - return [(verts_split, faces_split, unique_materials_split, key_to_name(key), bool(use_vnor), bool(use_vtex)) - for key, (verts_split, faces_split, unique_materials_split, _, use_vnor, use_vtex) + return [(verts_split, verts_color_split, faces_split, unique_materials_split, key_to_name(key), bool(use_vnor), bool(use_vtex)) + for key, (verts_split, verts_color_split, faces_split, unique_materials_split, _, use_vnor, use_vtex) 547 + verts_color, 685 + if verts_color: + color_attr = me.color_attributes.new(name='Col', type='FLOAT_COLOR', domain='POINT') + color_layer = color_attr.data + for vertex_index, vertex in enumerate(me.vertices): + color = verts_color[vertex_index] + color_layer[vertex_index].color = (*color, 1.0) 949 + verts_color = [] 1035 + if line_start == b'v' and len(line_split) > 4: + verts_color.append(list(map(float_func, line_split[4:7]))) + else: + verts_color.append((0.0, 0.0, 0.0)) 1244 - for data in split_mesh(verts_loc, faces, unique_materials, filepath, SPLIT_OB_OR_GROUP): - verts_loc_split, faces_split, unique_materials_split, dataname, use_vnor, use_vtex = data + for data in split_mesh(verts_loc, verts_color, faces, unique_materials, filepath, SPLIT_OB_OR_GROUP): + verts_loc_split, verts_color_split, faces_split, unique_materials_split, dataname, use_vnor, use_vtex = data 1251 + verts_color_split, ```

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Obj import does not import vertex color information #104621