Generated Images Are Hollow

I am experiencing an issue where the images I generate are completely hollow. I tried using the following code snippet to change the color(also with other kinds of attempts), but it only alters the line color without filling the shape:

for fc in TopologyExplorer(shape).faces():
    shape_to_display.SetCustomColor(fc, Quantity_Color(1.0, 0.647, 0.0, 0))

I'm unsure what the problem might be. Below is my complete source code:

import os
import glob
import json
import h5py
import numpy as np
from OCC.Core.gp import gp_Vec, gp_Trsf
from OCC.Core.TopLoc import TopLoc_Location
from OCC.Core.BRepCheck import BRepCheck_Analyzer
from OCC.Display.OCCViewer import Viewer3d
from OCC.Core.Graphic3d import Graphic3d_MaterialAspect, Graphic3d_NOM_BRASS, Graphic3d_NOM_SILVER
from OCC.Core.Quantity import Quantity_Color
import argparse
import sys
from tqdm import tqdm  # 导入 tqdm
sys.path.append("..")
from cadlib.extrude import CADSequence
from cadlib.visualize import vec2CADsolid, create_CAD

parser = argparse.ArgumentParser()
parser.add_argument('--src', type=str, required=True, help="source folder")
parser.add_argument('--form', type=str, default="h5", choices=["h5", "json"], help="file format")
parser.add_argument('--idx', type=int, default=0, help="show n files starting from idx.")
parser.add_argument('--num', type=int, default=2, help="number of shapes to show. -1 shows all shapes.")
parser.add_argument('--with_gt', action="store_true", help="also show the ground truth")
parser.add_argument('--filter', action="store_true", help="use opencascade analyzer to filter invalid model")
args = parser.parse_args()

src_dir = args.src
output_dir = "/home/kapibala/documents_for_work/Kuai/chores/DeepCAD/final_results"
out_paths = sorted(glob.glob(os.path.join(src_dir, "*.{}".format(args.form))))
if args.num != -1:
    out_paths = out_paths[args.idx:args.idx + args.num]

# Create offscreen renderer
offscreen_renderer = Viewer3d()
offscreen_renderer.Create()
offscreen_renderer.SetModeWireFrame()
offscreen_renderer.EnableAntiAliasing()
offscreen_renderer.SetSize(640, 480)  # Set render window size

# Create two quantity colors
color1 = Quantity_Color(1, 1, 1, 0)
color2 = Quantity_Color(1, 1, 1, 0)
offscreen_renderer.set_bg_gradient_color(color1, color2)
m = Graphic3d_NOM_SILVER

def translate_shape(shape, translate):
    trans = gp_Trsf()
    trans.SetTranslation(gp_Vec(translate[0], translate[1], translate[2]))
    loc = TopLoc_Location(trans)
    shape.Move(loc)
    return shape

for cnt, path in enumerate(tqdm(out_paths, desc="Rendering shapes")):
    try:
        if args.form == "h5":
            with h5py.File(path, 'r') as fp:
                out_vec = fp["out_vec"][:].astype(np.float)
                out_shape = vec2CADsolid(out_vec)
                if args.with_gt:
                    gt_vec = fp["gt_vec"][:].astype(np.float)
                    gt_shape = vec2CADsolid(gt_vec)
        else:
            with open(path, 'r') as fp:
                data = json.load(fp)
            cad_seq = CADSequence.from_dict(data)
            cad_seq.normalize()
            out_shape = create_CAD(cad_seq)

    except Exception as e:
        print(f"Load and create failed for {path}: {e}")
        continue

    if args.filter:
        analyzer = BRepCheck_Analyzer(out_shape)
        if not analyzer.IsValid():
            print("Detect invalid shape.")
            continue

    out_shape = translate_shape(out_shape, [0, 2 * (cnt % 10), 2 * (cnt // 10)])
    if args.form == "h5" and args.with_gt:
        gt_shape = translate_shape(gt_shape, [-2, 2 * (cnt % 10), 2 * (cnt // 10)])
        offscreen_renderer.DisplayShape([out_shape, gt_shape], update=True, material=m, transparency=0.5, color="BLACK")
    else:
        offscreen_renderer.DisplayShape(out_shape, update=True, material=m, transparency=0.5, color="BLACK")

    output_image_path = os.path.join(output_dir, f"shape_{cnt}.png")
    offscreen_renderer.ExportToImage(output_image_path)
    offscreen_renderer.EraseAll()

print("Rendering completed.")

tpaviot / pythonocc-core

Generated Images Are Hollow #1379