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import sys
import random
import torch
import numpy as np
import torch.nn.functional as F
from argparse import ArgumentParser
from core.registry import register_method
from core.base_method import BaseMethod
sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), '../../3DGS-DR')))
from utils.loss_utils import l1_loss, ssim
from gaussian_renderer import render as native_render
from scene import Scene, GaussianModel
from arguments import ModelParams, PipelineParams, OptimizationParams
@register_method("3dgs_dr")
class ThreeDGSDRWrapper(BaseMethod):
def __init__(self, dataset_config, hyperparams):
self.parser = ArgumentParser()
self.lp = ModelParams(self.parser)
self.op = OptimizationParams(self.parser)
self.pp = PipelineParams(self.parser)
self.args = self.parser.parse_args([])
self.args.source_path = dataset_config["source_path"]
self.args.model_path = dataset_config["model_path"]
self.args.eval = True
self.args.resolution = dataset_config.get("resolution", 1)
self.track_decoupling = hyperparams.get("track_decoupling", False)
self.dataset = self.lp.extract(self.args)
self.opt = self.op.extract(self.args)
self.pipe = self.pp.extract(self.args)
self.gaussians = GaussianModel(self.dataset.sh_degree)
# INJECTED_RES_FIX begin
import sys as _sys
_scene, _explicit_res = None, None
for _i, _a in enumerate(_sys.argv[:-1]):
_v = _sys.argv[_i + 1]
if _a == "--scene": _scene = _v
elif _a == "--source_path": _scene = _v.rstrip("/").split("/")[-1]
elif _a == "--resolution":
try: _explicit_res = int(_v)
except: pass
_OUTDOOR_360 = {"bicycle", "flowers", "garden", "stump", "treehill"}
if _explicit_res is not None and _explicit_res > 0:
_res = _explicit_res
elif _scene is not None:
_res = 4 if _scene in _OUTDOOR_360 else 2
else:
_res = None
try:
if _res is not None:
self.dataset.resolution = _res
print("[res-fix] scene=%s explicit=%s -> res=%s (%s)" % (_scene, _explicit_res, _res, __file__))
except Exception as _e:
print("[res-fix] FAILED:", _e)
# INJECTED_RES_FIX end
self.scene = Scene(self.dataset, self.gaussians)
self.gaussians.training_setup(self.opt)
bg_color = [1, 1, 1] if self.dataset.white_background else [0, 0, 0]
self.background = torch.tensor(bg_color, dtype=torch.float32, device="cuda")
self.viewpoint_stack = self.scene.getTrainCameras().copy()
self.last_n_gaussians = len(self.gaussians.get_xyz)
def train_iteration(self, step):
self.gaussians.update_learning_rate(step)
if step > self.opt.feature_rest_from_iter and step % 1000 == 0:
self.gaussians.oneupSHdegree()
initial_stage = step <= self.opt.init_until_iter
if not self.viewpoint_stack:
self.viewpoint_stack = self.scene.getTrainCameras().copy()
viewpoint_cam = self.viewpoint_stack.pop(random.randint(0, len(self.viewpoint_stack) - 1))
render_pkg = native_render(viewpoint_cam, self.gaussians, self.pipe, self.background, initial_stage=initial_stage)
image = render_pkg["render"]
viewspace_point_tensor = render_pkg["viewspace_points"]
visibility_filter = render_pkg["visibility_filter"]
radii = render_pkg["radii"]
gt_image = viewpoint_cam.original_image.cuda()
Ll1 = l1_loss(image, gt_image)
ssim_value = ssim(image, gt_image)
loss_target = (1.0 - self.opt.lambda_dssim) * Ll1
loss_parasitic = self.opt.lambda_dssim * (1.0 - ssim_value)
loss = loss_target + loss_parasitic
if self.opt.use_env_scope and 'refl_strength_map' in render_pkg:
center = torch.tensor([float(c) for c in self.opt.env_scope_center], device='cuda')
outside_msk = torch.sum((self.gaussians.get_xyz - center[None])**2, dim=-1) > self.opt.env_scope_radius**2
refls = self.gaussians.get_refl
refl_msk_loss = refls[outside_msk].mean()
loss += 0.4 * refl_msk_loss
grad_cos_sim = 0.0
parasitic_ratio = 0.0
if self.track_decoupling and step % 100 == 0:
self.gaussians.optimizer.zero_grad(set_to_none=True)
loss_target.backward(retain_graph=True)
grad_target = self.gaussians._xyz.grad.clone() if self.gaussians._xyz.grad is not None else torch.zeros_like(self.gaussians._xyz)
self.gaussians.optimizer.zero_grad(set_to_none=True)
loss_parasitic.backward(retain_graph=True)
grad_parasitic = self.gaussians._xyz.grad.clone() if self.gaussians._xyz.grad is not None else torch.zeros_like(self.gaussians._xyz)
valid_mask = (torch.norm(grad_target, dim=1) > 0) & (torch.norm(grad_parasitic, dim=1) > 0)
if valid_mask.any():
grad_cos_sim = float(F.cosine_similarity(grad_target[valid_mask], grad_parasitic[valid_mask], dim=1).mean())
parasitic_ratio = float(torch.norm(grad_parasitic, dim=1).mean() / (torch.norm(grad_target, dim=1).mean() + 1e-7))
self.gaussians.optimizer.zero_grad(set_to_none=True)
loss.backward()
else:
loss.backward()
with torch.no_grad():
DENSIFY_UNTIL_ITER = self.opt.densify_until_iter + self.opt.longer_prop_iter
NORMAL_PROP_UNTIL_ITER = self.opt.normal_prop_until_iter + self.opt.longer_prop_iter
if step < DENSIFY_UNTIL_ITER:
self.gaussians.max_radii2D[visibility_filter] = torch.max(self.gaussians.max_radii2D[visibility_filter], radii[visibility_filter])
self.gaussians.add_densification_stats(viewspace_point_tensor, visibility_filter)
if step <= self.opt.init_until_iter:
opacity_reset_intval = 3000
densification_interval = 100
elif step <= NORMAL_PROP_UNTIL_ITER:
opacity_reset_intval = 3000
densification_interval = self.opt.densification_interval_when_prop
else:
opacity_reset_intval = 3000
densification_interval = 100
if step > self.opt.densify_from_iter and step % densification_interval == 0:
size_threshold = 20 if step > self.opt.opacity_reset_interval else None
self.gaussians.densify_and_prune(self.opt.densify_grad_threshold, self.opt.prune_opacity_threshold, self.scene.cameras_extent, size_threshold)
HAS_RESET0 = False
if step % opacity_reset_intval == 0 or (self.dataset.white_background and step == self.opt.densify_from_iter):
HAS_RESET0 = True
self.gaussians.reset_opacity0()
self.gaussians.reset_refl()
if self.opt.opac_lr0_interval > 0 and (self.opt.init_until_iter < step <= NORMAL_PROP_UNTIL_ITER) and step % self.opt.opac_lr0_interval == 0:
self.gaussians.set_opacity_lr(self.opt.opacity_lr)
if (self.opt.init_until_iter < step <= NORMAL_PROP_UNTIL_ITER) and step % 1000 == 0:
if not HAS_RESET0:
self.gaussians.reset_opacity1()
self.gaussians.dist_color()
self.gaussians.reset_scale()
if self.opt.opac_lr0_interval > 0 and step != NORMAL_PROP_UNTIL_ITER:
self.gaussians.set_opacity_lr(0.0)
self.gaussians.optimizer.step()
self.gaussians.optimizer.zero_grad(set_to_none=True)
num_gaussians = self.gaussians.get_xyz.shape[0]
metrics = {
"loss": float(loss), "loss_l1": float(loss_target), "loss_ssim": float(loss_parasitic),
"num_gaussians": int(num_gaussians), "delta_N": int(num_gaussians - self.last_n_gaussians),
"peak_vram_GB": float(torch.cuda.max_memory_allocated() / (1024 ** 3)),
"grad_cos_sim": float(grad_cos_sim), "parasitic_ratio": float(parasitic_ratio)
}
self.last_n_gaussians = num_gaussians
histograms = {}
if step % 1000 == 0:
histograms["opacity"] = torch.sigmoid(self.gaussians._opacity).clone().detach()
scales = torch.exp(self.gaussians._scaling).clone().detach()
histograms["scaling"] = scales
scales_2d = scales[:, :2] if scales.shape[1] >= 2 else scales
gamma = scales_2d.max(dim=-1)[0] / (scales_2d.min(dim=-1)[0] + 1e-7)
histograms["anisotropy"] = gamma
histograms["sh_dc_mag"] = self.gaussians._features_dc.detach().norm(dim=-1)
histograms["refl_strength"] = torch.sigmoid(self.gaussians._refl_strength).clone().detach()
return metrics, histograms
def render(self, camera):
with torch.no_grad():
render_pkg = native_render(camera, self.gaussians, self.pipe, self.background, initial_stage=False)
return {"image": render_pkg["render"], "depth": render_pkg.get("depth", None)}
def save(self, save_dir, step):
self.scene.save(step)
def load(self, model_path, iteration):
self.gaussians.load_ply(os.path.join(model_path, 'point_cloud', f'iteration_{iteration}', 'point_cloud.ply'))
def get_spatial_centers(self):
return self.gaussians._xyz
def compute_physical_metrics(self, cameras=None):
metrics = {}
with torch.no_grad():
raw_scales = self.gaussians._scaling
scales = torch.exp(raw_scales)
scales_2d = scales[:, :2] if scales.dim() > 1 and scales.shape[1] >= 2 else scales.unsqueeze(-1).expand(-1, 2)
max_S, _ = torch.max(scales_2d, dim=1)
min_S, _ = torch.min(scales_2d, dim=1)
gamma = max_S / (min_S + 1e-7)
metrics["gamma_median"] = float(torch.median(gamma))
metrics["gamma_90th_percentile"] = float(torch.quantile(gamma, 0.90))
metrics["scale_mean"] = float(torch.mean(scales_2d))
metrics["alpha_mean"] = float(torch.mean(torch.sigmoid(self.gaussians._opacity)))
metrics["refl_mean"] = float(torch.mean(torch.sigmoid(self.gaussians._refl_strength)))
dc, rest = self.gaussians._features_dc, self.gaussians._features_rest
if rest is not None and rest.shape[1] > 0:
metrics["sh_energy_ratio"] = float(rest.norm(dim=-1).mean() / (dc.norm(dim=-1).mean() + 1e-7))
if cameras is not None and len(cameras) > 0:
view_dirs = []
for c in cameras:
view_dirs.append(c.world_view_transform[:3, 2].tolist())
view_dirs = F.normalize(torch.tensor(view_dirs, dtype=torch.float32, device="cuda"), dim=1)
rots = F.normalize(self.gaussians._rotation.clone(), dim=1)
w, x, y, z = rots.unbind(dim=-1)
normals = F.normalize(torch.stack([2*(x*z + w*y), 2*(y*z - w*x), 1-2*(x*x + y*y)], dim=-1), dim=1)
max_cos, _ = torch.max(torch.abs(torch.matmul(normals, view_dirs.T)), dim=1)
metrics["billboard_bias_ratio"] = float((max_cos > 0.90).float().mean())
return metrics
def evaluate_spatial_field(self, query_points: torch.Tensor, cameras=None) -> torch.Tensor:
with torch.no_grad():
V = query_points.shape[0]
densities = torch.zeros(V, device="cuda")
xyz, opacities = self.gaussians._xyz, torch.sigmoid(self.gaussians._opacity).squeeze()
scales = torch.exp(self.gaussians._scaling)
sigma_sq = (scales[:, :2].max(dim=1)[0].pow(2)) if scales.shape[1] >= 2 else scales.squeeze().pow(2)
N_gaussians = xyz.shape[0]
chunk_size = max(1, 30_000_000 // (N_gaussians + 1))
for i in range(0, V, chunk_size):
end = min(i + chunk_size, V)
dist_sq = torch.cdist(query_points[i:end], xyz, p=2).pow(2)
weights = torch.exp(-0.5 * dist_sq / (sigma_sq.unsqueeze(0) + 1e-7))
densities[i:end] = torch.sum(weights * opacities.unsqueeze(0), dim=1)
return densities
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