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| from tqdm import tqdm | |
| from PIL import Image | |
| import numpy as np | |
| import torch | |
| from typing import List | |
| from mesh_reconstruction.remesh import calc_vertex_normals | |
| from mesh_reconstruction.opt import MeshOptimizer | |
| from mesh_reconstruction.func import make_star_cameras_orthographic, make_star_cameras_orthographic_py3d | |
| from mesh_reconstruction.render import NormalsRenderer, Pytorch3DNormalsRenderer | |
| from scripts.utils import to_py3d_mesh, init_target | |
| def reconstruct_stage1(pils: List[Image.Image], steps=100, vertices=None, faces=None, start_edge_len=0.15, end_edge_len=0.005, decay=0.995, return_mesh=True, loss_expansion_weight=0.1, gain=0.1): | |
| vertices, faces = vertices.to("cuda"), faces.to("cuda") | |
| assert len(pils) == 4 | |
| mv,proj = make_star_cameras_orthographic(4, 1) | |
| renderer = NormalsRenderer(mv,proj,list(pils[0].size)) | |
| # cameras = make_star_cameras_orthographic_py3d([0, 270, 180, 90], device="cuda", focal=1., dist=4.0) | |
| # renderer = Pytorch3DNormalsRenderer(cameras, list(pils[0].size), device="cuda") | |
| target_images = init_target(pils, new_bkgd=(0., 0., 0.)) # 4s | |
| # 1. no rotate | |
| target_images = target_images[[0, 3, 2, 1]] | |
| # 2. init from coarse mesh | |
| opt = MeshOptimizer(vertices,faces, local_edgelen=False, gain=gain, edge_len_lims=(end_edge_len, start_edge_len)) | |
| vertices = opt.vertices | |
| mask = target_images[..., -1] < 0.5 | |
| for i in tqdm(range(steps)): | |
| opt.zero_grad() | |
| opt._lr *= decay | |
| normals = calc_vertex_normals(vertices,faces) | |
| images = renderer.render(vertices,normals,faces) | |
| loss_expand = 0.5 * ((vertices+normals).detach() - vertices).pow(2).mean() | |
| t_mask = images[..., -1] > 0.5 | |
| loss_target_l2 = (images[t_mask] - target_images[t_mask]).abs().pow(2).mean() | |
| loss_alpha_target_mask_l2 = (images[..., -1][mask] - target_images[..., -1][mask]).pow(2).mean() | |
| loss = loss_target_l2 + loss_alpha_target_mask_l2 + loss_expand * loss_expansion_weight | |
| # out of box | |
| loss_oob = (vertices.abs() > 0.99).float().mean() * 10 | |
| loss = loss + loss_oob | |
| loss.backward() | |
| opt.step() | |
| vertices,faces = opt.remesh(poisson=False) | |
| vertices, faces = vertices.detach().cpu(), faces.detach().cpu() | |
| if return_mesh: | |
| return to_py3d_mesh(vertices, faces) | |
| else: | |
| return vertices, faces | |