svrm/predictor.py

# Open Source Model Licensed under the Apache License Version 2.0 
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# The below Model in this distribution may have been modified by THL A29 Limited 
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# Copyright (C) 2024 THL A29 Limited, a Tencent company.  All rights reserved. 
# The below software and/or models in this distribution may have been 
# modified by THL A29 Limited ("Tencent Modifications"). 
# All Tencent Modifications are Copyright (C) THL A29 Limited.

# Hunyuan 3D is licensed under the TENCENT HUNYUAN NON-COMMERCIAL LICENSE AGREEMENT 
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import os
import math
import time
import torch
import numpy as np
from tqdm import tqdm
from PIL import Image, ImageSequence
from omegaconf import OmegaConf
from torchvision import transforms
from safetensors.torch import save_file, load_file
from .ldm.util import instantiate_from_config
from .ldm.vis_util import render_func

class MV23DPredictor(object):
    def __init__(self, ckpt_path, cfg_path, elevation=15, number_view=60, 
                render_size=256, device="cuda:0") -> None:
        self.device = device
        self.elevation = elevation
        self.number_view = number_view
        self.render_size = render_size

        self.elevation_list = [0, 0, 0, 0, 0, 0, 0]
        self.azimuth_list = [0, 60, 120, 180, 240, 300, 0]

        self.model = self.init_model(ckpt_path, cfg_path)

        self.input_view_transform = transforms.Compose([
            transforms.Resize(504, interpolation=Image.BICUBIC),
            transforms.ToTensor(),
        ])
        self.final_input_view_transform = transforms.Normalize((0.485, 0.456, 0.406), (0.229, 0.224, 0.225))

    def init_model(self, ckpt_path, cfg_path):
        config = OmegaConf.load(cfg_path)
        model = instantiate_from_config(config.model)

        weights = load_file("./weights/svrm/svrm.safetensors")
        model.load_state_dict(weights)

        model.to(self.device)
        model = model.eval()
        model.render.half()
        print(f'Load model successfully')
        return model

    def create_camera_to_world_matrix(self, elevation, azimuth, cam_dis=1.5):
        # elevation azimuth are radians
        # Convert elevation and azimuth angles to Cartesian coordinates on a unit sphere
        x = np.cos(elevation) * np.cos(azimuth)
        y = np.cos(elevation) * np.sin(azimuth)
        z = np.sin(elevation)

        # Calculate camera position, target, and up vectors
        camera_pos = np.array([x, y, z]) * cam_dis
        target = np.array([0, 0, 0])
        up = np.array([0, 0, 1])

        # Construct view matrix
        forward = target - camera_pos
        forward /= np.linalg.norm(forward)
        right = np.cross(forward, up)
        right /= np.linalg.norm(right)
        new_up = np.cross(right, forward)
        new_up /= np.linalg.norm(new_up)
        cam2world = np.eye(4)
        cam2world[:3, :3] = np.array([right, new_up, -forward]).T
        cam2world[:3, 3] = camera_pos
        return cam2world

    def refine_mask(self, mask, k=16):
        mask /= 255.0
        boder_mask = (mask >= -math.pi / 2.0 / k + 0.5) & (mask <= math.pi / 2.0 / k + 0.5)
        mask[boder_mask] = 0.5 * np.sin(k * (mask[boder_mask] - 0.5)) + 0.5
        mask[mask < -math.pi / 2.0 / k + 0.5] = 0.0
        mask[mask > math.pi / 2.0 / k + 0.5] = 1.0
        return (mask * 255.0).astype(np.uint8)

    def load_images_and_cameras(self, input_imgs, elevation_list, azimuth_list):
        input_image_list = []
        input_cam_list = []
        for input_view_image, elevation, azimuth in zip(input_imgs, elevation_list, azimuth_list):
            input_view_image = self.input_view_transform(input_view_image)  
            input_image_list.append(input_view_image)

            input_view_cam_pos = self.create_camera_to_world_matrix(np.radians(elevation), np.radians(azimuth))
            input_view_cam_intrinsic = np.array([35. / 32, 35. /32, 0.5, 0.5])
            input_view_cam = torch.from_numpy(
                np.concatenate([input_view_cam_pos.reshape(-1), input_view_cam_intrinsic], 0)
            ).float()
            input_cam_list.append(input_view_cam)

        pixels_input = torch.stack(input_image_list, dim=0)
        input_images = self.final_input_view_transform(pixels_input)
        input_cams = torch.stack(input_cam_list, dim=0)
        return input_images, input_cams

    def load_data(self, intput_imgs):
        assert (6+1) == len(intput_imgs)
        
        input_images, input_cams = self.load_images_and_cameras(intput_imgs, self.elevation_list, self.azimuth_list)
        input_cams[-1, :] = 0 # for user input view
        
        data = {}
        data["input_view"] = input_images.unsqueeze(0).to(self.device)    # 1 4 3 512 512
        data["input_view_cam"] = input_cams.unsqueeze(0).to(self.device)  # 1 4 20
        return data

    @torch.no_grad()
    def predict(
        self, 
        intput_imgs, 
        save_dir = "outputs/", 
        image_input = None,
        target_face_count = 10000,
        do_texture_mapping = True,
    ):
        os.makedirs(save_dir, exist_ok=True)
        print(save_dir)
        
        with torch.cuda.amp.autocast():
            self.model.export_mesh_with_uv(
                data = self.load_data(intput_imgs),
                out_dir = save_dir,
                target_face_count = target_face_count,
                do_texture_mapping = do_texture_mapping
            )