Abhishek Joshi
322 lines
13 KiB
Python
322 lines
13 KiB
Python
import os
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import pprint
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import mujoco
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from usd_utils import *
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from PIL import ImageOps
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from mujoco import mjtGeom
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from PIL import Image as im
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from usd_component import *
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from pxr import Usd, UsdGeom
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from termcolor import colored
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from mujoco import mjv_averageCamera
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from typing import Optional, List, Union, Tuple
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from mujoco import _structs, _constants, _enums
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from scipy.spatial.transform import Rotation as R
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class USDExporter:
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def __init__(
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self,
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model: _structs.MjModel,
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height: int = 480,
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width: int = 480,
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max_geom: int = 10000,
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output_directory_name: str = "mujoco_usdpkg",
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output_directory_root: str = "./",
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verbose: bool = True,
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light_intensity: int = 10000
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):
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""" Initializes a new USD Renderer
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Args:
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model: an MjModel instance.
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height: image height in pixels.
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width: image width in pixels.
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max_geom: Optional integer specifying the maximum number of geoms that can
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be rendered in the same scene. If None this will be chosen automatically
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based on the estimated maximum number of renderable geoms in the model.
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output_directory_name: name of root directory to store outputted frames and assets generated by the USD renderer.
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output_directory_root: path to root directory storing generated frames and assets by the USD renderer.
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verbose: decides whether to print updates.
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"""
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buffer_width = model.vis.global_.offwidth
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buffer_height = model.vis.global_.offheight
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if width > buffer_width:
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raise ValueError(f"""
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Image width {width} > framebuffer width {buffer_width}. Either reduce the image
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width or specify a larger offscreen framebuffer in the model XML using the
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clause:
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<visual>
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<global offwidth="my_width"/>
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</visual>""".lstrip())
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if height > buffer_height:
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raise ValueError(f"""
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Image height {height} > framebuffer height {buffer_height}. Either reduce the
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image height or specify a larger offscreen framebuffer in the model XML using
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the clause:
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<visual>
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<global offheight="my_height"/>
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</visual>""".lstrip())
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self.model = model
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self.height = height
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self.width = width
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self.max_geom = max_geom
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self.output_directory_name = output_directory_name
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self.output_directory_root = output_directory_root
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self.verbose = verbose
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self.light_intensity = light_intensity
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self.frame_count = 0 # maintains how many times we have saved the scene
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self.updates = 0
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# initializing rendering requirements
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self.renderer = mujoco.Renderer(model, height, width, max_geom)
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self._initialize_usd_stage()
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self._scene_option = _structs.MjvOption() # using default scene option
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# initializing output_directories
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self._initialize_output_directories()
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# loading required textures for the scene
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self._load_textures()
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@property
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def usd(self):
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return self.stage.GetRootLayer().ExportToString()
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@property
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def scene(self):
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return self.renderer.scene
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def _initialize_usd_stage(self):
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self.stage = Usd.Stage.CreateInMemory()
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UsdGeom.SetStageUpAxis(self.stage, UsdGeom.Tokens.z)
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self.stage.SetStartTimeCode(0)
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# add as user imput
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self.stage.SetTimeCodesPerSecond(60.0)
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def _initialize_output_directories(self):
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self.output_directory_path = os.path.join(self.output_directory_root, self.output_directory_name)
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if not os.path.exists(self.output_directory_path):
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os.makedirs(self.output_directory_path)
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self.frames_directory = os.path.join(self.output_directory_path, "frames")
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if not os.path.exists(self.frames_directory):
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os.makedirs(self.frames_directory)
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self.assets_directory = os.path.join(self.output_directory_path, "assets")
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if not os.path.exists(self.assets_directory):
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os.makedirs(self.assets_directory)
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if self.verbose:
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print(colored(f"Writing output frames and assets to {self.output_directory_path}", "green"))
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def update_scene(
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self,
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data: _structs.MjData,
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camera: Union[int, str, _structs.MjvCamera] = -1,
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scene_option: Optional[_structs.MjvOption] = None,
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):
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""" Updates the scene with latest sim data
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Args:
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data: structure storing current simulation state
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scene_option: we use this to determine which geom groups to activate
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"""
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self.frame_count += 1
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scene_option = scene_option or self._scene_option
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# update the mujoco renderer
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self.renderer.update_scene(data,
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scene_option=scene_option,
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camera=camera)
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# TODO: update scene options
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if self.updates == 0:
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self._initialize_usd_stage()
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self._load_geoms()
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self._load_lights()
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self._load_cameras()
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self._update_geoms()
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self._update_lights()
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self._update_cameras()
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self.updates += 1
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def _load_textures(self):
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# TODO: remove code once added internally to mujoco
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data_adr = 0
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self.texture_files = []
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for texture_id in range(self.model.ntex):
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texture_height = self.model.tex_height[texture_id]
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texture_width = self.model.tex_width[texture_id]
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pixels = 3*texture_height*texture_width
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img = im.fromarray(self.model.tex_rgb[data_adr:data_adr+pixels].reshape(texture_height, texture_width, 3))
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img = ImageOps.flip(img)
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texture_file_name = f"texture_{texture_id}.png"
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img.save(os.path.join(self.assets_directory, texture_file_name))
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relative_path = os.path.relpath(self.assets_directory, self.frames_directory)
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img_path = os.path.join(relative_path, texture_file_name) # relative path, TODO: switch back to this
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self.texture_files.append(img_path)
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data_adr += pixels
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if self.verbose:
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print(colored(f"Writing texture {texture_id}", "cyan"))
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if self.verbose:
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print(colored(f"Completed writing {self.model.ntex} textures to {self.assets_directory}", "green"))
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def _load_geoms(self):
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# stores a list of all the geoms in the scene
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self.usd_geoms = []
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# initializing the geoms
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for i in range(self.scene.ngeom):
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geom = self.scene.geoms[i]
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if geom.rgba[3] <= 0:
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self.usd_geoms.append(None)
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continue
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# handles meshes in scene
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if geom.type == mjtGeom.mjGEOM_MESH:
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usd_geom = USDMesh(stage=self.stage,
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model=self.model,
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geom=geom,
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objid=i,
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dataid=self.model.geom_dataid[geom.objid],
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rgba=geom.rgba,
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texture_file=self.texture_files[geom.texid] if geom.texid != -1 else None)
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# handles primitives
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else:
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if geom.type == mjtGeom.mjGEOM_PLANE:
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usd_geom = USDPlaneMesh(stage=self.stage,
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geom=geom,
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objid=i,
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rgba=geom.rgba,
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texture_file=self.texture_files[geom.texid] if geom.texid != -1 else None)
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elif geom.type == mjtGeom.mjGEOM_SPHERE:
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usd_geom = USDSphereMesh(stage=self.stage,
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geom=geom,
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objid=i,
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rgba=geom.rgba,
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texture_file=self.texture_files[geom.texid] if geom.texid != -1 else None)
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elif geom.type == mjtGeom.mjGEOM_CAPSULE:
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usd_geom = USDCapsule(stage=self.stage,
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geom=geom,
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objid=i,
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rgba=geom.rgba,
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texture_file=self.texture_files[geom.texid] if geom.texid != -1 else None)
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elif geom.type == mjtGeom.mjGEOM_ELLIPSOID:
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usd_geom = USDEllipsoid(stage=self.stage,
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geom=geom,
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objid=i,
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rgba=geom.rgba,
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texture_file=self.texture_files[geom.texid] if geom.texid != -1 else None)
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elif geom.type == mjtGeom.mjGEOM_CYLINDER:
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usd_geom = USDCylinderMesh(stage=self.stage,
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geom=geom,
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objid=i,
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rgba=geom.rgba,
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texture_file=self.texture_files[geom.texid] if geom.texid != -1 else None)
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elif geom.type == mjtGeom.mjGEOM_BOX:
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usd_geom = USDCubeMesh(stage=self.stage,
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geom=geom,
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objid=i,
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rgba=geom.rgba,
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texture_file=self.texture_files[geom.texid] if geom.texid != -1 else None)
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else:
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usd_geom = None
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self.usd_geoms.append(usd_geom)
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def _update_geoms(self):
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# iterate through all geoms in the scene and makes update
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for i in range(self.scene.ngeom):
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geom = self.scene.geoms[i]
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if self.usd_geoms[i]:
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self.usd_geoms[i].update(pos=geom.pos,
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mat=geom.mat,
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frame=self.updates)
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def _load_lights(self):
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# initializes an usd light object for every light in the scene
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self.usd_lights = []
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for i in range(self.scene.nlight):
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light = self.scene.lights[i]
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self.usd_lights.append(USDLight(stage=self.stage,
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objid=i))
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def _update_lights(self):
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for i in range(self.scene.nlight):
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light = self.scene.lights[i]
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self.usd_lights[i].update(pos=light.pos,
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intensity=self.light_intensity,
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color=light.diffuse,
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frame=self.updates)
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def _load_cameras(self):
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self.camera = USDCamera(stage=self.stage,
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objid=0)
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def _update_cameras(self):
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camera = mjv_averageCamera(self.scene.camera[0], self.scene.camera[1])
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forward = camera.forward
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up = camera.up
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right = np.cross(forward, up)
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R = np.eye(3)
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R[:, 0] = right
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R[:, 1] = up
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R[:, 2] = -forward
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self.camera.update(cam_pos=camera.pos,
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cam_mat=R,
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frame=self.updates)
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def add_light(self,
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pos: List[float],
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intensity:int,
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radius: Optional[float] = 1.0,
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color: Optional[np.array] = np.array([0.3, 0.3, 0.3]),
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objid: Optional[int]=1):
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new_light = USDLight(stage=self.stage,
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objid=objid,
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radius=radius)
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new_light.update(pos=pos,
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intensity=intensity,
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color=color,
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frame=0)
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def add_camera(self,
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pos:List[float],
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rotation_xyz:List[float],
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objid: Optional[int]=1):
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# TODO: change this!
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new_camera = USDCamera(stage=self.stage,
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objid=objid)
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r = R.from_euler('xyz', rotation_xyz, degrees=True)
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new_camera.update(cam_pos=pos,
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cam_mat=r.as_matrix(),
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frame=0)
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def save_scene(self):
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self.stage.SetEndTimeCode(self.frame_count)
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# with open(f'./{self.output_directory_name}/frames/frame_{self.frame_count}_.usd', "w") as f:
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# f.write(self.usd)
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self.stage.Export(f'./{self.output_directory_name}/frames/frame_{self.frame_count}_.usd')
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if self.verbose:
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print(colored(f"Writing frame_{self.frame_count}", "green"))# |