在 Python 中渲染 GLB/GLTF 动画帧

pip install aspose-3d

import hashlib
import math
from pathlib import Path

import aspose.threed as a3d
from aspose.pydrawing import Color, Size
from aspose.pydrawing.imaging import ImageFormat
from aspose.threed.entities import Camera
from aspose.threed.utilities import Vector3

INPUT_FILE = Path("animated_model.glb")
OUTPUT_DIR = Path("frames")
FRAMES_PER_SECOND = 5
IMAGE_WIDTH = 800
IMAGE_HEIGHT = 600

def main():
    if not INPUT_FILE.is_file():
        raise FileNotFoundError(f"Input model not found: {INPUT_FILE}")

scene = a3d.Scene.from_file(str(INPUT_FILE))
    clips = list(scene.animation_clips)
    if not clips:
        raise RuntimeError("The input model has no animation clips.")

clip = clips[0]
    duration = float(clip.stop - clip.start)
    if duration <= 0:
        raise ValueError("The selected animation has no positive time range.")

# Use the same camera position for every frame.
    camera = Camera()
    camera_node = scene.root_node.create_child_node("PreviewCamera", camera)
    camera_node.transform.translation = Vector3(3, 2, 6)
    camera.look_at = Vector3.ORIGIN

options = a3d.ImageRenderOptions()
    options.background_color = Color.white
    options.asset_directories.append(str(INPUT_FILE.resolve().parent))

OUTPUT_DIR.mkdir(parents=True, exist_ok=True)
    frame_count = max(1, math.ceil(duration * FRAMES_PER_SECOND))
    hashes = set()

for frame_index in range(frame_count):
        timestamp = float(clip.start) + frame_index / FRAMES_PER_SECOND
        clip.apply_to(timestamp)

frame_path = OUTPUT_DIR / f"frame_{frame_index:04d}.png"
        scene.render(
            camera,
            str(frame_path),
            Size(IMAGE_WIDTH, IMAGE_HEIGHT),
            ImageFormat.png,
            options,
        )

if not frame_path.is_file() or frame_path.stat().st_size == 0:
            raise RuntimeError(f"Rendering did not create a usable PNG: {frame_path}")

hashes.add(hashlib.sha256(frame_path.read_bytes()).digest())
        print(f"Frame {frame_index + 1}/{frame_count}: {frame_path} at {timestamp:.3f}s")

if frame_count > 1 and len(hashes) == 1:
        print("WARNING: All PNG files are byte-identical. Check animation state and camera view.")

print(f"Created {frame_count} PNG file(s) in {OUTPUT_DIR}/")

if __name__ == "__main__":
    main()

python render_glb_animation_frames.py