current_dir = os.path.dirname(os.path.realpath(__file__)) data_dir = os.path.join(current_dir, 'data') class Model(nn.Module): def __init__(self, template_path): super(Model, self).__init__() # set template mesh self.template_mesh = jr.Mesh.from_obj(template_path, dr_type='n3mr') self.vertices = (self.template_mesh.vertices * 0.5).stop_grad() self.faces = self.template_mesh.faces.stop_grad() self.textures = self.template_mesh.textures.stop_grad() # optimize for displacement map and center self.displace = jt.zeros(self.template_mesh.vertices.shape) self.center = jt.zeros((1, 1, 3)) # define Laplacian and flatten geometry constraints self.laplacian_loss = LaplacianLoss(self.vertices[0], self.faces[0]) self.flatten_loss = FlattenLoss(self.faces[0]) def execute(self, batch_size): base = jt.log(self.vertices.abs() / (1 - self.vertices.abs())) centroid = jt.tanh(self.center) vertices = (base + self.displace).sigmoid() * nn.sign(self.vertices) vertices = nn.relu(vertices) * (1 - centroid) - nn.relu(-vertices) * (centroid + 1) vertices = vertices + centroid # apply Laplacian and flatten geometry constraints laplacian_loss = self.laplacian_loss(vertices).mean() flatten_loss = self.flatten_loss(vertices).mean() return jr.Mesh(vertices.repeat(batch_size, 1, 1), self.faces.repeat(batch_size, 1, 1), dr_type='n3mr'), laplacian_loss, flatten_loss 在每行代码后添加注释

# 导入必要的包
import os
import jittor as jt
from jittor import nn
import jrender as jr

# 定义数据文件夹路径
current_dir = os.path.dirname(os.path.realpath(__file__))
data_dir = os.path.join(current_dir, 'data')

# 定义模型类
class Model(nn.Module):

def __init__(self, template_path):
super(Model, self).__init__()

# 设置模板网格
self.template_mesh = jr.Mesh.from_obj(template_path, dr_type='n3mr')
self.vertices = (self.template_mesh.vertices * 0.5).stop_grad() # 顶点坐标
self.faces = self.template_mesh.faces.stop_grad() # 面
self.textures = self.template_mesh.textures.stop_grad() # 纹理

# 优化位移贴图和中心点
self.displace = jt.zeros(self.template_mesh.vertices.shape) # 位移贴图
self.center = jt.zeros((1, 1, 3)) # 中心点坐标

# 定义拉普拉斯约束和平坦几何约束
self.laplacian_loss = LaplacianLoss(self.vertices[0], self.faces[0])
self.flatten_loss = FlattenLoss(self.faces[0])

def execute(self, batch_size):
base = jt.log(self.vertices.abs() / (1 - self.vertices.abs())) # 基础值
centroid = jt.tanh(self.center) # 中心点
vertices = (base + self.displace).sigmoid() * nn.sign(self.vertices) # 顶点坐标
vertices = nn.relu(vertices) * (1 - centroid) - nn.relu(-vertices) * (centroid + 1) # 顶点坐标变换
vertices = vertices + centroid # 顶点坐标变换

# 应用拉普拉斯约束和平坦几何约束
laplacian_loss = self.laplacian_loss(vertices).mean() # 拉普拉斯约束损失
flatten_loss = self.flatten_loss(vertices).mean() # 平坦几何约束损失

return jr.Mesh(vertices.repeat(batch_size, 1, 1), # 重复顶点坐标
self.faces.repeat(batch_size, 1, 1), # 重复面
dr_type='n3mr'), laplacian_loss, flatten_loss