embodied_gen/validators/urdf_convertor.py

# Project EmbodiedGen
#
# Copyright (c) 2025 Horizon Robotics. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#       http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied. See the License for the specific language governing
# permissions and limitations under the License.


import logging
import os
import shutil
import xml.etree.ElementTree as ET
from datetime import datetime
from xml.dom.minidom import parseString

import numpy as np
import trimesh
from embodied_gen.utils.gpt_clients import GPT_CLIENT, GPTclient
from embodied_gen.utils.process_media import render_asset3d
from embodied_gen.utils.tags import VERSION

logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)


__all__ = ["URDFGenerator"]


URDF_TEMPLATE = """
<robot name="template_robot">
    <link name="template_link">
        <visual>
            <geometry>
                <mesh filename="mesh.obj" scale="1.0 1.0 1.0"/>
            </geometry>
        </visual>
        <collision>
            <geometry>
                <mesh filename="mesh.obj" scale="1.0 1.0 1.0"/>
            </geometry>
            <gazebo>
                <mu1>0.8</mu1> <!-- Main friction coefficient -->
                <mu2>0.6</mu2> <!-- Secondary friction coefficient -->
            </gazebo>
        </collision>
        <inertial>
            <mass value="1.0"/>
            <origin xyz="0 0 0"/>
            <inertia ixx="1.0" ixy="0.0" ixz="0.0" iyy="1.0" iyz="0.0" izz="1.0"/>
        </inertial>
        <extra_info>
            <scale>1.0</scale>
            <version>"0.0.0"</version>
            <category>"unknown"</category>
            <description>"unknown"</description>
            <min_height>0.0</min_height>
            <max_height>0.0</max_height>
            <real_height>0.0</real_height>
            <min_mass>0.0</min_mass>
            <max_mass>0.0</max_mass>
            <generate_time>"-1"</generate_time>
            <gs_model>""</gs_model>
        </extra_info>
    </link>
</robot>
"""


class URDFGenerator(object):
    def __init__(
        self,
        gpt_client: GPTclient,
        mesh_file_list: list[str] = ["material_0.png", "material.mtl"],
        prompt_template: str = None,
        attrs_name: list[str] = None,
        render_dir: str = "urdf_renders",
        render_view_num: int = 4,
    ) -> None:
        if mesh_file_list is None:
            mesh_file_list = []
        self.mesh_file_list = mesh_file_list
        self.output_mesh_dir = "mesh"
        self.output_render_dir = render_dir
        self.gpt_client = gpt_client
        self.render_view_num = render_view_num
        if render_view_num == 4:
            view_desc = "This is orthographic projection showing the front, left, right and back views "  # noqa
        else:
            view_desc = "This is the rendered views "

        if prompt_template is None:
            prompt_template = (
                view_desc
                + """of the 3D object asset,
                category: {category}.
                Give the category of this object asset (within 3 words),
                (if category is already provided, use it directly),
                accurately describe this 3D object asset (within 15 words),
                and give the recommended geometric height range (unit: meter),
                weight range (unit: kilogram), the average static friction
                coefficient of the object relative to rubber and the average
                dynamic friction coefficient of the object relative to rubber.
                Return response format as shown in Example.

                Example:
                Category: cup
                Description: shiny golden cup with floral design
                Height: 0.1-0.15 m
                Weight: 0.3-0.6 kg
                Static friction coefficient: 1.1
                Dynamic friction coefficient: 0.9
            """
            )

        self.prompt_template = prompt_template
        if attrs_name is None:
            attrs_name = [
                "category",
                "description",
                "min_height",
                "max_height",
                "real_height",
                "min_mass",
                "max_mass",
                "version",
                "generate_time",
                "gs_model",
            ]
        self.attrs_name = attrs_name

    def parse_response(self, response: str) -> dict[str, any]:
        lines = response.split("\n")
        lines = [line.strip() for line in lines if line]
        category = lines[0].split(": ")[1]
        description = lines[1].split(": ")[1]
        min_height, max_height = map(
            lambda x: float(x.strip().replace(",", "").split()[0]),
            lines[2].split(": ")[1].split("-"),
        )
        min_mass, max_mass = map(
            lambda x: float(x.strip().replace(",", "").split()[0]),
            lines[3].split(": ")[1].split("-"),
        )
        mu1 = float(lines[4].split(": ")[1].replace(",", ""))
        mu2 = float(lines[5].split(": ")[1].replace(",", ""))

        return {
            "category": category.lower(),
            "description": description.lower(),
            "min_height": round(min_height, 4),
            "max_height": round(max_height, 4),
            "min_mass": round(min_mass, 4),
            "max_mass": round(max_mass, 4),
            "mu1": round(mu1, 2),
            "mu2": round(mu2, 2),
            "version": VERSION,
            "generate_time": datetime.now().strftime("%Y%m%d%H%M%S"),
        }

    def generate_urdf(
        self,
        input_mesh: str,
        output_dir: str,
        attr_dict: dict,
        output_name: str = None,
    ) -> str:
        """Generate a URDF file for a given mesh with specified attributes.

        Args:
            input_mesh (str): Path to the input mesh file.
            output_dir (str): Directory to store the generated URDF
                and processed mesh.
            attr_dict (dict): Dictionary containing attributes like height,
                mass, and friction coefficients.
            output_name (str, optional): Name for the generated URDF and robot.

        Returns:
            str: Path to the generated URDF file.
        """

        # 1. Load and normalize the mesh
        mesh = trimesh.load(input_mesh)
        mesh_scale = np.ptp(mesh.vertices, axis=0).max()
        mesh.vertices /= mesh_scale  # Normalize to [-0.5, 0.5]
        raw_height = np.ptp(mesh.vertices, axis=0)[1]

        # 2. Scale the mesh to real height
        real_height = attr_dict["real_height"]
        scale = round(real_height / raw_height, 6)
        mesh = mesh.apply_scale(scale)

        # 3. Prepare output directories and save scaled mesh
        mesh_folder = os.path.join(output_dir, self.output_mesh_dir)
        os.makedirs(mesh_folder, exist_ok=True)

        obj_name = os.path.basename(input_mesh)
        mesh_output_path = os.path.join(mesh_folder, obj_name)
        mesh.export(mesh_output_path)

        # 4. Copy additional mesh files, if any
        input_dir = os.path.dirname(input_mesh)
        for file in self.mesh_file_list:
            src_file = os.path.join(input_dir, file)
            dest_file = os.path.join(mesh_folder, file)
            if os.path.isfile(src_file):
                shutil.copy(src_file, dest_file)

        # 5. Determine output name
        if output_name is None:
            output_name = os.path.splitext(obj_name)[0]

        # 6. Load URDF template and update attributes
        robot = ET.fromstring(URDF_TEMPLATE)
        robot.set("name", output_name)

        link = robot.find("link")
        if link is None:
            raise ValueError("URDF template is missing 'link' element.")
        link.set("name", output_name)

        # Update visual geometry
        visual = link.find("visual/geometry/mesh")
        if visual is not None:
            visual.set(
                "filename", os.path.join(self.output_mesh_dir, obj_name)
            )
            visual.set("scale", "1.0 1.0 1.0")

        # Update collision geometry
        collision = link.find("collision/geometry/mesh")
        if collision is not None:
            collision.set(
                "filename", os.path.join(self.output_mesh_dir, obj_name)
            )
            collision.set("scale", "1.0 1.0 1.0")

        # Update friction coefficients
        gazebo = link.find("collision/gazebo")
        if gazebo is not None:
            for param, key in zip(["mu1", "mu2"], ["mu1", "mu2"]):
                element = gazebo.find(param)
                if element is not None:
                    element.text = f"{attr_dict[key]:.2f}"

        # Update mass
        inertial = link.find("inertial/mass")
        if inertial is not None:
            mass_value = (attr_dict["min_mass"] + attr_dict["max_mass"]) / 2
            inertial.set("value", f"{mass_value:.4f}")

        # Add extra_info element to the link
        extra_info = link.find("extra_info/scale")
        if extra_info is not None:
            extra_info.text = f"{scale:.6f}"

        for key in self.attrs_name:
            extra_info = link.find(f"extra_info/{key}")
            if extra_info is not None and key in attr_dict:
                extra_info.text = f"{attr_dict[key]}"

        # 7. Write URDF to file
        os.makedirs(output_dir, exist_ok=True)
        urdf_path = os.path.join(output_dir, f"{output_name}.urdf")
        tree = ET.ElementTree(robot)
        tree.write(urdf_path, encoding="utf-8", xml_declaration=True)

        logger.info(f"URDF file saved to {urdf_path}")

        return urdf_path

    @staticmethod
    def get_attr_from_urdf(
        urdf_path: str,
        attr_root: str = ".//link/extra_info",
        attr_name: str = "scale",
    ) -> float:
        if not os.path.exists(urdf_path):
            raise FileNotFoundError(f"URDF file not found: {urdf_path}")

        mesh_scale = 1.0
        tree = ET.parse(urdf_path)
        root = tree.getroot()
        extra_info = root.find(attr_root)
        if extra_info is not None:
            scale_element = extra_info.find(attr_name)
            if scale_element is not None:
                mesh_scale = float(scale_element.text)

        return mesh_scale

    @staticmethod
    def add_quality_tag(
        urdf_path: str, results, output_path: str = None
    ) -> None:
        if output_path is None:
            output_path = urdf_path

        tree = ET.parse(urdf_path)
        root = tree.getroot()
        custom_data = ET.SubElement(root, "custom_data")
        quality = ET.SubElement(custom_data, "quality")
        for key, value in results:
            checker_tag = ET.SubElement(quality, key)
            checker_tag.text = str(value)

        rough_string = ET.tostring(root, encoding="utf-8")
        formatted_string = parseString(rough_string).toprettyxml(indent="   ")
        cleaned_string = "\n".join(
            [line for line in formatted_string.splitlines() if line.strip()]
        )

        os.makedirs(os.path.dirname(output_path), exist_ok=True)
        with open(output_path, "w", encoding="utf-8") as f:
            f.write(cleaned_string)

        logger.info(f"URDF files saved to {output_path}")

    def get_estimated_attributes(self, asset_attrs: dict):
        estimated_attrs = {
            "height": round(
                (asset_attrs["min_height"] + asset_attrs["max_height"]) / 2, 4
            ),
            "mass": round(
                (asset_attrs["min_mass"] + asset_attrs["max_mass"]) / 2, 4
            ),
            "mu": round((asset_attrs["mu1"] + asset_attrs["mu2"]) / 2, 4),
            "category": asset_attrs["category"],
        }

        return estimated_attrs

    def __call__(
        self,
        mesh_path: str,
        output_root: str,
        text_prompt: str = None,
        category: str = "unknown",
        **kwargs,
    ):
        if text_prompt is None or len(text_prompt) == 0:
            text_prompt = self.prompt_template
            text_prompt = text_prompt.format(category=category.lower())

        image_path = render_asset3d(
            mesh_path,
            output_root,
            num_images=self.render_view_num,
            output_subdir=self.output_render_dir,
        )

        # Hardcode tmp because of the openrouter can't input multi images.
        if "openrouter" in self.gpt_client.endpoint:
            from embodied_gen.utils.process_media import (
                combine_images_to_base64,
            )

            image_path = combine_images_to_base64(image_path)

        response = self.gpt_client.query(text_prompt, image_path)
        if response is None:
            asset_attrs = {
                "category": category.lower(),
                "description": category.lower(),
                "min_height": 1,
                "max_height": 1,
                "min_mass": 1,
                "max_mass": 1,
                "mu1": 0.8,
                "mu2": 0.6,
                "version": VERSION,
                "generate_time": datetime.now().strftime("%Y%m%d%H%M%S"),
            }
        else:
            asset_attrs = self.parse_response(response)
        for key in self.attrs_name:
            if key in kwargs:
                asset_attrs[key] = kwargs[key]

        asset_attrs["real_height"] = round(
            (asset_attrs["min_height"] + asset_attrs["max_height"]) / 2, 4
        )

        self.estimated_attrs = self.get_estimated_attributes(asset_attrs)

        urdf_path = self.generate_urdf(mesh_path, output_root, asset_attrs)

        logger.info(f"response: {response}")

        return urdf_path


if __name__ == "__main__":
    urdf_gen = URDFGenerator(GPT_CLIENT, render_view_num=4)
    urdf_path = urdf_gen(
        mesh_path="outputs/imageto3d/cma/o5/URDF_o5/mesh/o5.obj",
        output_root="outputs/test_urdf",
        # category="coffee machine",
        # min_height=1.0,
        # max_height=1.2,
        version=VERSION,
    )

    # zip_files(
    #     input_paths=[
    #         "scripts/apps/tmp/2umpdum3e5n/URDF_sample/mesh",
    #         "scripts/apps/tmp/2umpdum3e5n/URDF_sample/sample.urdf"
    #     ],
    #     output_zip="zip.zip"
    # )