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# -*- coding: utf-8 -*-
import os
import cv2
import numpy as np
import PIL.Image
from typing import Optional
import trimesh
def save_obj(pointnp_px3, facenp_fx3, fname):
fid = open(fname, "w")
write_str = ""
for pidx, p in enumerate(pointnp_px3):
pp = p
write_str += "v %f %f %f\n" % (pp[0], pp[1], pp[2])
for i, f in enumerate(facenp_fx3):
f1 = f + 1
write_str += "f %d %d %d\n" % (f1[0], f1[1], f1[2])
fid.write(write_str)
fid.close()
return
def savemeshtes2(pointnp_px3, tcoords_px2, facenp_fx3, facetex_fx3, tex_map, fname):
fol, na = os.path.split(fname)
na, _ = os.path.splitext(na)
matname = "%s/%s.mtl" % (fol, na)
fid = open(matname, "w")
fid.write("newmtl material_0\n")
fid.write("Kd 1 1 1\n")
fid.write("Ka 0 0 0\n")
fid.write("Ks 0.4 0.4 0.4\n")
fid.write("Ns 10\n")
fid.write("illum 2\n")
fid.write("map_Kd %s.png\n" % na)
fid.close()
####
fid = open(fname, "w")
fid.write("mtllib %s.mtl\n" % na)
for pidx, p in enumerate(pointnp_px3):
pp = p
fid.write("v %f %f %f\n" % (pp[0], pp[1], pp[2]))
for pidx, p in enumerate(tcoords_px2):
pp = p
fid.write("vt %f %f\n" % (pp[0], pp[1]))
fid.write("usemtl material_0\n")
for i, f in enumerate(facenp_fx3):
f1 = f + 1
f2 = facetex_fx3[i] + 1
fid.write("f %d/%d %d/%d %d/%d\n" % (f1[0], f2[0], f1[1], f2[1], f1[2], f2[2]))
fid.close()
PIL.Image.fromarray(np.ascontiguousarray(tex_map), "RGB").save(
os.path.join(fol, "%s.png" % na))
return
class MeshOutput(object):
def __init__(self,
mesh_v: np.ndarray,
mesh_f: np.ndarray,
vertex_colors: Optional[np.ndarray] = None,
uvs: Optional[np.ndarray] = None,
mesh_tex_idx: Optional[np.ndarray] = None,
tex_map: Optional[np.ndarray] = None):
self.mesh_v = mesh_v
self.mesh_f = mesh_f
self.vertex_colors = vertex_colors
self.uvs = uvs
self.mesh_tex_idx = mesh_tex_idx
self.tex_map = tex_map
def contain_uv_texture(self):
return (self.uvs is not None) and (self.mesh_tex_idx is not None) and (self.tex_map is not None)
def contain_vertex_colors(self):
return self.vertex_colors is not None
def export(self, fname):
if self.contain_uv_texture():
savemeshtes2(
self.mesh_v,
self.uvs,
self.mesh_f,
self.mesh_tex_idx,
self.tex_map,
fname
)
elif self.contain_vertex_colors():
mesh_obj = trimesh.Trimesh(vertices=self.mesh_v, faces=self.mesh_f, vertex_colors=self.vertex_colors)
mesh_obj.export(fname)
else:
save_obj(
self.mesh_v,
self.mesh_f,
fname
)
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