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from pathlib import Path
import json
import numpy as np
import imageio
from .utils import blend_rgba
def load_blender(split, scene="lego", half_res=False):
assert split in ("train", "val", "test")
env_fname = Path(__file__).resolve().parents[1] / "env.json"
with env_fname.open("r") as f:
root = json.load(f)['data_root']
root = Path(root) / scene
with open(root / f'transforms_{split}.json', "r") as f:
meta = json.load(f)
imgs, poses = [], []
for frame in meta['frames']:
file_name = root / f"{frame['file_path']}.png"
im = imageio.imread(file_name)
c2w = frame['transform_matrix']
imgs.append(im)
poses.append(c2w)
imgs = (np.array(imgs) / 255.).astype(np.float32) # (RGBA) imgs
imgs = blend_rgba(imgs)
poses = np.array(poses).astype(np.float)
H, W = imgs[0].shape[:2]
camera_angle_x = float(meta['camera_angle_x'])
f = 1 / np.tan(camera_angle_x / 2) * (W / 2)
if half_res:
raise NotImplementedError()
K = np.array([
[f, 0, -(W/2 - 0.5)],
[0, -f, -(H/2 - 0.5)],
[0, 0, -1]
]) # note OpenGL -ve z convention;
return imgs, K, poses
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