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from dataclasses import dataclass, field
import cv2
import numpy as np
import torch
import threestudio
from threestudio.models.background.base import BaseBackground
from threestudio.models.exporters.base import Exporter, ExporterOutput
from threestudio.models.geometry.base import BaseImplicitGeometry
from threestudio.models.materials.base import BaseMaterial
from threestudio.models.mesh import Mesh
from threestudio.utils.rasterize import NVDiffRasterizerContext
from threestudio.utils.typing import *
@threestudio.register("mesh-exporter")
class MeshExporter(Exporter):
@dataclass
class Config(Exporter.Config):
fmt: str = "obj-mtl" # in ['obj-mtl', 'obj'], TODO: fbx
save_name: str = "model"
save_normal: bool = False
save_uv: bool = True
save_texture: bool = True
texture_size: int = 1024
texture_format: str = "jpg"
xatlas_chart_options: dict = field(default_factory=dict)
xatlas_pack_options: dict = field(default_factory=dict)
context_type: str = "gl"
cfg: Config
def configure(
self,
geometry: BaseImplicitGeometry,
material: BaseMaterial,
background: BaseBackground,
) -> None:
super().configure(geometry, material, background)
self.ctx = NVDiffRasterizerContext(self.cfg.context_type, self.device)
def __call__(self) -> List[ExporterOutput]:
mesh: Mesh = self.geometry.isosurface()
if self.cfg.fmt == "obj-mtl":
return self.export_obj_with_mtl(mesh)
elif self.cfg.fmt == "obj":
return self.export_obj(mesh)
else:
raise ValueError(f"Unsupported mesh export format: {self.cfg.fmt}")
def export_obj_with_mtl(self, mesh: Mesh) -> List[ExporterOutput]:
params = {
"mesh": mesh,
"save_mat": True,
"save_normal": self.cfg.save_normal,
"save_uv": self.cfg.save_uv,
"save_vertex_color": False,
"map_Kd": None, # Base Color
"map_Ks": None, # Specular
"map_Bump": None, # Normal
# ref: https://en.wikipedia.org/wiki/Wavefront_.obj_file#Physically-based_Rendering
"map_Pm": None, # Metallic
"map_Pr": None, # Roughness
"map_format": self.cfg.texture_format,
}
if self.cfg.save_uv:
mesh.unwrap_uv(self.cfg.xatlas_chart_options, self.cfg.xatlas_pack_options)
if self.cfg.save_texture:
threestudio.info("Exporting textures ...")
assert self.cfg.save_uv, "save_uv must be True when save_texture is True"
# clip space transform
uv_clip = mesh.v_tex * 2.0 - 1.0
# pad to four component coordinate
uv_clip4 = torch.cat(
(
uv_clip,
torch.zeros_like(uv_clip[..., 0:1]),
torch.ones_like(uv_clip[..., 0:1]),
),
dim=-1,
)
# rasterize
rast, _ = self.ctx.rasterize_one(
uv_clip4, mesh.t_tex_idx, (self.cfg.texture_size, self.cfg.texture_size)
)
hole_mask = ~(rast[:, :, 3] > 0)
def uv_padding(image):
uv_padding_size = self.cfg.xatlas_pack_options.get("padding", 2)
inpaint_image = (
cv2.inpaint(
(image.detach().cpu().numpy() * 255).astype(np.uint8),
(hole_mask.detach().cpu().numpy() * 255).astype(np.uint8),
uv_padding_size,
cv2.INPAINT_TELEA,
)
/ 255.0
)
return torch.from_numpy(inpaint_image).to(image)
# Interpolate world space position
gb_pos, _ = self.ctx.interpolate_one(
mesh.v_pos, rast[None, ...], mesh.t_pos_idx
)
gb_pos = gb_pos[0]
# Sample out textures from MLP
geo_out = self.geometry.export(points=gb_pos)
mat_out = self.material.export(points=gb_pos, **geo_out)
threestudio.info(
"Perform UV padding on texture maps to avoid seams, may take a while ..."
)
if "albedo" in mat_out:
params["map_Kd"] = uv_padding(mat_out["albedo"])
else:
threestudio.warn(
"save_texture is True but no albedo texture found, using default white texture"
)
if "metallic" in mat_out:
params["map_Pm"] = uv_padding(mat_out["metallic"])
if "roughness" in mat_out:
params["map_Pr"] = uv_padding(mat_out["roughness"])
if "bump" in mat_out:
params["map_Bump"] = uv_padding(mat_out["bump"])
# TODO: map_Ks
return [
ExporterOutput(
save_name=f"{self.cfg.save_name}.obj", save_type="obj", params=params
)
]
def export_obj(self, mesh: Mesh) -> List[ExporterOutput]:
params = {
"mesh": mesh,
"save_mat": False,
"save_normal": self.cfg.save_normal,
"save_uv": self.cfg.save_uv,
"save_vertex_color": False,
"map_Kd": None, # Base Color
"map_Ks": None, # Specular
"map_Bump": None, # Normal
# ref: https://en.wikipedia.org/wiki/Wavefront_.obj_file#Physically-based_Rendering
"map_Pm": None, # Metallic
"map_Pr": None, # Roughness
"map_format": self.cfg.texture_format,
}
if self.cfg.save_uv:
mesh.unwrap_uv(self.cfg.xatlas_chart_options, self.cfg.xatlas_pack_options)
if self.cfg.save_texture:
threestudio.info("Exporting textures ...")
geo_out = self.geometry.export(points=mesh.v_pos)
mat_out = self.material.export(points=mesh.v_pos, **geo_out)
if "albedo" in mat_out:
mesh.set_vertex_color(mat_out["albedo"])
params["save_vertex_color"] = True
else:
threestudio.warn(
"save_texture is True but no albedo texture found, not saving vertex color"
)
return [
ExporterOutput(
save_name=f"{self.cfg.save_name}.obj", save_type="obj", params=params
)
]
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