mypillowsateyou
commented
1 year ago This would be an amazing feature. I reverse engineered the color info in the .3mf file and I have a workaround in place that I use to import .obj files with vertex color data. Here is a screenshot of a test I did where I transferred a color indexed and dithered texture to vertex colors of an obj with over a million triangles in Blender:
- I import my .obj into a new Bambu Studio project, then save it as a .3mf file somewhere
- I extract the .model file from the saved .3mf
- then I run this python script I made in blender to transfer vertex color data from the .obj file to the triangles of the .model file as a new file prefixed with new_
- When that completes I rename the .model files so the new file has the original name and drag it back into the .3mf open in 7-zip and overwrite the old file and close 7-zip
- Then in Bambu Studio I reopen the project and the triangles have colors
- I then have to set up the filament colors to match whatever I used in my texture
- It is critical the .obj really only has up to 16 different colors assigned to vertices for the script to work properly and when exporting the mesh from Blender as .obj it should all be triangles, number of triangles and faces should be equal because it assumes the number of faces in the .obj and the number of triangles in the .model are the same
here is the Python script:
import json
import os
import bpy
# Define your filenames
obj_filename = 'obj_file_here.obj'
model_filename = 'model_file_here.model'
blend_file_path = bpy.data.filepath
blend_dir = os.path.dirname(blend_file_path)
print(f'Blend file path: {blend_file_path}')
print(f'Blend directory: {blend_dir}')
# Get the current script directory
script_dir = blend_dir
print(f'Script directory: {script_dir}')
# Combine the directory with the filenames
full_obj_path = os.path.join(script_dir, obj_filename)
full_model_path = os.path.join(script_dir, model_filename)
print(f'OBJ file path: {full_obj_path}')
print(f'Model file path: {full_model_path}')
# Set up Bambu Studio color array
bambu_studio_colors = ['4', '8', '0C', '1C', '2C', '3C', '4C', '5C', '6C', '7C', '8C', '9C', 'AC', 'BC', 'CC', 'DC']
next_color_index = 0
color_mapping = {}
# Read .obj file
print("Reading .obj file...")
with open(full_obj_path, 'r') as file:
obj_lines = file.readlines()
vertices = []
faces = []
for i, line in enumerate(obj_lines):
if(i%100000==0):
print(f"Processing line {i+1} in .obj file...")
row = line.strip().split(' ')
if row[0] == 'v':
r, g, b = row[4], row[5], row[6]
vertices.append({'r': r, 'g': g, 'b': b})
elif row[0] == 'f':
vertex_indices = [int(v.split('/')[0]) - 1 for v in row[1:4]]
colors = [vertices[index] for index in vertex_indices]
if None in colors:
print(f'Missing color data for face at row {i + 1}')
continue
color_counts = {}
for color in colors:
color_string = json.dumps(color)
if color_string in color_counts:
color_counts[color_string] += 1
else:
color_counts[color_string] = 1
max_count = -1
most_frequent_color = None
for color_string, count in color_counts.items():
if count > max_count:
max_count = count
most_frequent_color = color_string
faces.append(most_frequent_color)
print(f"Total vertices: {len(vertices)}")
print(f"Total faces: {len(faces)}")
print("Generating face color mappings...")
face_color_mappings = []
for i, color_string in enumerate(faces):
if color_string not in color_mapping:
if next_color_index < len(bambu_studio_colors) and next_color_index < 16:
color_mapping[color_string] = bambu_studio_colors[next_color_index]
next_color_index += 1
else:
color_mapping[color_string] = 'error'
color_code = color_mapping[color_string]
color = json.loads(color_string)
face_color_mappings.append([f'Face {i + 1}', color['r'], color['g'], color['b'], color_code])
print(f"Total colors: {len(color_mapping)}")
print("Color mappings:")
for color_string, color_code in color_mapping.items():
color = json.loads(color_string)
r = int(float(color['r']) * 255)
g = int(float(color['g']) * 255)
b = int(float(color['b']) * 255)
print(f"Color RGB({r}, {g}, {b}) -> Color code: {color_code}")
# Read .model file
print("Reading .model file...")
with open(full_model_path, 'r') as file:
model_lines = file.readlines()
triangle_count = 0
face_index = 0
for i, line in enumerate(model_lines):
if(i%100000==0):
print(f"Processing line {i+1} in .model file...")
line = line.strip()
if line.startswith('<triangle') and line.endswith('/>'):
triangle_count += 1
color_code = face_color_mappings[face_index][4]
line = line.replace('/>', f' paint_color="{color_code}"/>')
face_index += 1
model_lines[i] = line
print(f"Total triangles: {triangle_count}")
# Write new .model file
print("Writing new .model file...")
new_model_path = os.path.join(script_dir, 'new_' + model_filename)
with open(new_model_path, 'w') as file:
for line in model_lines:
file.write(line + '\n')
print("Done!")
For anyone curious this is Blender geometry nodes I used to map my texture (which is indexed, 7 colors) to vertex Color attribute, very important to use Closest in Image Texture node and Point domain in Store Named Attribute, I do not recommend baking, it always seemed to stray from the original 7 colors and therefore become useless for my script:
Hope my workaround helps inspire a real feature implementation
lanewei120
xuhao1
tinogithub
creechoftheeast
VickyTGAW
ScottFerg56
THE-SIMPLE-MARK
SaltWei
ukdavewood
nhnifong
Haidiye00
CptJackieSparrow
amoose136
There will indeed be a color difference issue because we did not use Phong lighting to pre render and obtain this color. We only used the diffuse color, so there will be differences
KodeMunkie
mew1033
FEMit160
Haidiye01
Is your feature request related to a problem? Please describe. When I trying to import STEP, obj or 3MF with color/texture. It will loss color in Bambu Studio
Describe the solution you'd like When import these 3D file, the color/texture will be keep, so we can directly edit the color/texture in 3D software like Fusion360, and use bambu X1CC to print it. That will benefit a lot to use Bambu create impressive 3D arts.
Describe alternatives you've considered No
Additional context No