init

hy3dshape/tools/render/render.py

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+# Hunyuan 3D is licensed under the TENCENT HUNYUAN NON-COMMERCIAL LICENSE AGREEMENT
+# except for the third-party components listed below.
+# Hunyuan 3D does not impose any additional limitations beyond what is outlined
+# in the repsective licenses of these third-party components.
+# Users must comply with all terms and conditions of original licenses of these third-party
+# components and must ensure that the usage of the third party components adheres to
+# all relevant laws and regulations.
+
+# For avoidance of doubts, Hunyuan 3D means the large language models and
+# their software and algorithms, including trained model weights, parameters (including
+# optimizer states), machine-learning model code, inference-enabling code, training-enabling code,
+# fine-tuning enabling code and other elements of the foregoing made publicly available
+# by Tencent in accordance with TENCENT HUNYUAN COMMUNITY LICENSE AGREEMENT.
+
+
+import argparse, sys, os, math, re, glob
+from typing import *
+import bpy
+from mathutils import Vector, Matrix
+import numpy as np
+import json
+import glob
+import random
+import shutil
+import mathutils
+import cv2
+
+"""=============== BLENDER ==============="""
+
+IMPORT_FUNCTIONS: Dict[str, Callable] = {
+    "obj": bpy.ops.import_scene.obj,
+    "glb": bpy.ops.import_scene.gltf,
+    "gltf": bpy.ops.import_scene.gltf,
+    "usd": bpy.ops.import_scene.usd,
+    "fbx": bpy.ops.import_scene.fbx,
+    "stl": bpy.ops.import_mesh.stl,
+    "usda": bpy.ops.import_scene.usda,
+    "dae": bpy.ops.wm.collada_import,
+    "ply": bpy.ops.import_mesh.ply,
+    "abc": bpy.ops.wm.alembic_import,
+    "blend": bpy.ops.wm.append,
+}
+
+EXT = {
+    'PNG': 'png',
+    'JPEG': 'jpg',
+    'OPEN_EXR': 'exr',
+    'TIFF': 'tiff',
+    'BMP': 'bmp',
+    'HDR': 'hdr',
+    'TARGA': 'tga'
+}
+
+PRIMES = [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53]
+
+def radical_inverse(base, n):
+    val = 0
+    inv_base = 1.0 / base
+    inv_base_n = inv_base
+    while n > 0:
+        digit = n % base
+        val += digit * inv_base_n
+        n //= base
+        inv_base_n *= inv_base
+    return val
+
+def halton_sequence(dim, n):
+    return [radical_inverse(PRIMES[dim], n) for dim in range(dim)]
+
+def hammersley_sequence(dim, n, num_samples):
+    return [n / num_samples] + halton_sequence(dim - 1, n)
+
+def sphere_hammersley_sequence(n, num_samples, offset=(0, 0)):
+    u, v = hammersley_sequence(2, n, num_samples)
+    u += offset[0] / num_samples
+    v += offset[1]
+    u = 2 * u if u < 0.25 else 2 / 3 * u + 1 / 3
+    theta = np.arccos(1 - 2 * u) - np.pi / 2
+    phi = v * 2 * np.pi
+    return [phi, theta]
+
+def trellis_cond_camera_sequence(num_cond_views):
+    yaws = []
+    pitchs = []
+    offset = (np.random.rand(), np.random.rand())
+    for i in range(num_cond_views):
+        y, p = sphere_hammersley_sequence(i, num_cond_views, offset)
+        yaws.append(y)
+        pitchs.append(p)
+    fov_min, fov_max = 10, 70
+    radius_min = np.sqrt(3) / 2 / np.sin(fov_max / 360 * np.pi)
+    radius_max = np.sqrt(3) / 2 / np.sin(fov_min / 360 * np.pi)
+    k_min = 1 / radius_max**2
+    k_max = 1 / radius_min**2
+    ks = np.random.uniform(k_min, k_max, (1000000,))
+    radius = [1 / np.sqrt(k) for k in ks]
+    fov = [2 * np.arcsin(np.sqrt(3) / 2 / r) for r in radius]
+
+    views = [{'hangle': y, 'vangle': p, 'cam_dis': r, 'fov': f, 'proj_type': 0} \
+             for y, p, r, f in zip(yaws, pitchs, radius, fov)]
+    return views
+
+def orthogonal_camera_sequence():
+    yaws = [-0.5 * np.pi, 0, 0.5 * np.pi, np.pi, -0.5 * np.pi, -0.5 * np.pi]
+    pitchs = [0, 0, 0, 0, 0.5 * np.pi, -0.5 * np.pi]
+    radius = [1.5 for i in range(6)]
+    fov = [1.5 * np.arcsin(np.sqrt(3) / 2 / r) for r in radius]
+    views = [{'hangle': y, 'vangle': p, 'cam_dis': r, 'fov': f, 'proj_type': 1} \
+             for y, p, r, f in zip(yaws, pitchs, radius, fov)]
+    return views
+
+
+def switch_to_mr_render(render_base_color, output_nodes):
+    bpy.context.scene.view_settings.view_transform = 'Raw'
+    bpy.context.scene.use_nodes = True
+    tree = bpy.context.scene.node_tree
+    links = tree.links
+
+    for i in range(len(output_nodes)):
+        if i + 1 != len(output_nodes):
+            for l in output_nodes[i][1].links:
+                links.remove(l)
+        else:
+            links.new(output_nodes[i][0], output_nodes[i][1])
+
+    for material in bpy.data.materials:
+        if not material.use_nodes:
+            continue
+        bsdf_node = None
+        output_node = None
+        node_tree = material.node_tree
+        links = material.node_tree.links
+        nodes = node_tree.nodes
+        for node in node_tree.nodes:
+            # Check if the node is a BSDF node
+            if node.type == 'BSDF_PRINCIPLED':
+                bsdf_node = node
+            if node.type == 'OUTPUT_MATERIAL':
+                output_node = node
+        if bsdf_node is None or output_node is None:
+            continue
+        #bsdf_node.inputs['Emission'].default_value = 0
+        bsdf_node.inputs['Emission Strength'].default_value = 0
+        mr_node = None
+        bc_node = None
+        for node in node_tree.nodes:
+            # Check if the node is a BSDF node
+            if node.name == 'COMBINE_METALLIC_ROUGHNESS':
+                mr_node = node
+            if node.name == 'COMBINE_BASE_COLOR':
+                bc_node = node
+        if mr_node is None:
+            combine_rgb_node = nodes.new('ShaderNodeCombineColor')
+            #combine_rgb_node.name = 'COMBINE_METALLIC_ROUGHNESS'
+            
+            # Optionally, set the RGB values
+            combine_rgb_node.inputs['Red'].default_value = 1.0
+            combine_rgb_node.inputs['Green'].default_value = 0.5
+            combine_rgb_node.inputs['Blue'].default_value = 0.0
+            metallic_input = bsdf_node.inputs["Metallic"]
+
+            if metallic_input.links:
+                source_endpoint = metallic_input.links[0].from_socket
+                links.new(source_endpoint, combine_rgb_node.inputs['Blue'])
+
+            roughness_input = bsdf_node.inputs['Roughness']
+            if roughness_input.links:
+                source_endpoint = roughness_input.links[0].from_socket
+                links.new(source_endpoint, combine_rgb_node.inputs['Green'])
+
+            emission_shader = nodes.new("ShaderNodeEmission")
+            emission_shader.inputs["Strength"].default_value = 1
+            links.new(combine_rgb_node.outputs["Color"], emission_shader.inputs["Color"])
+
+            mix_shader = nodes.new("ShaderNodeMixShader")
+            mix_shader.name = 'COMBINE_METALLIC_ROUGHNESS'
+            links.new(bsdf_node.outputs["BSDF"], mix_shader.inputs[1])
+            links.new(emission_shader.outputs["Emission"], mix_shader.inputs[2])
+            mr_node = mix_shader
+
+            mix_shader_bc = nodes.new("ShaderNodeMixShader")
+            mix_shader_bc.name = 'COMBINE_BASE_COLOR'
+            
+            if len(bsdf_node.inputs['Base Color'].links) > 0:
+                socket = bsdf_node.inputs['Base Color'].links[0].from_socket
+                gamma_node = node_tree.nodes.new(type='ShaderNodeGamma')
+
+                gamma_node.inputs[1].default_value = 0.454
+                node_tree.links.new(socket, gamma_node.inputs[0])
+                node_tree.links.new(gamma_node.outputs[0], mix_shader_bc.inputs[1])
+
+            links.new(mix_shader.outputs["Shader"], mix_shader_bc.inputs[2])
+            bc_node = mix_shader_bc
+
+            for l in output_node.inputs['Surface'].links:
+                links.remove(l)
+            links.new(mix_shader_bc.outputs["Shader"], output_node.inputs["Surface"])
+
+        mr_node.inputs["Fac"].default_value = 1.0
+        if render_base_color:
+            bc_node.inputs['Fac'].default_value = 0.0
+        else:
+            bc_node.inputs['Fac'].default_value = 1.0
+
+def switch_to_color_render(output_nodes):
+    bpy.context.scene.view_settings.view_transform = 'Standard'
+    bpy.context.scene.use_nodes = True
+    tree = bpy.context.scene.node_tree
+    links = tree.links
+
+    for i in range(len(output_nodes)):
+        if i + 1 == len(output_nodes):
+            for l in output_nodes[i][1].links:
+                links.remove(l)
+        else:
+            links.new(output_nodes[i][0], output_nodes[i][1])
+
+    for material in bpy.data.materials:
+        if not material.use_nodes:
+            continue
+        node_tree = material.node_tree
+        links = material.node_tree.links
+        nodes = node_tree.nodes
+        mr_node = None
+        bc_node = None
+        for node in node_tree.nodes:
+            if node.name == 'COMBINE_METALLIC_ROUGHNESS':
+                mr_node = node
+            if node.name == 'COMBINE_BASE_COLOR':
+                bc_node = node
+        if mr_node is not None and bc_node is not None:
+            mr_node.inputs["Fac"].default_value = 0.0
+            if len(bc_node.inputs[1].links) > 0:
+                try:
+                    node = bc_node.inputs[1].links[0].from_socket.node
+                    node.image.colorspace_settings.name = 'sRGB'
+                except:
+                    pass
+
+# def ConvertNormalMap(input_exr, output_jpg):
+#     import OpenEXR
+#     import Imath
+#     file = OpenEXR.InputFile(input_exr)
+#     channels = file.header()['channels'].keys()
+
+#     # Get the image data
+#     data_window = file.header()['dataWindow']
+#     width = data_window.max.x - data_window.min.x + 1
+#     height = data_window.max.y - data_window.min.y + 1
+
+#     # Read the X, Y, and Z channels as 32-bit floats
+#     x_channel = np.frombuffer(file.channel('X', Imath.PixelType(Imath.PixelType.FLOAT)), dtype=np.float32)
+#     y_channel = np.frombuffer(file.channel('Y', Imath.PixelType(Imath.PixelType.FLOAT)), dtype=np.float32)
+#     z_channel = np.frombuffer(file.channel('Z', Imath.PixelType(Imath.PixelType.FLOAT)), dtype=np.float32)
+
+#     # Reshape the channels into 2D arrays
+#     x_channel = x_channel.reshape((height, width))
+#     y_channel = y_channel.reshape((height, width))
+#     z_channel = z_channel.reshape((height, width))
+
+#     # Stack the channels to create a 3D array
+#     normal = np.stack((x_channel, y_channel, z_channel), axis=-1)
+#     normal = ((normal * 0.5 + 0.5) * 255).astype('uint8')
+#     cv2.imwrite(output_jpg, normal)
+
+
+def ConvertNormalMap(input_exr, output_jpg):
+    # Read EXR file with OpenCV (returns float32 image)
+    exr_img = cv2.imread(input_exr, cv2.IMREAD_UNCHANGED)
+    if exr_img is None:
+        raise RuntimeError(f"Failed to load EXR file: {input_exr}")
+    print(f"EXR shape: {exr_img.shape}, dtype: {exr_img.dtype}")
+    normal = ((exr_img * 0.5 + 0.5) * 255).clip(0, 255).astype(np.uint8)
+    cv2.imwrite(output_jpg, normal)
+    print(f"Saved normal map to {output_jpg}")
+
+
+gidx = 0
+def ConvertDepthMap(input_exr, output_png):
+    import bpy
+    
+    # cam = bpy.data.objects.get('Camera')
+    cams = [obj for obj in bpy.data.objects if obj.type == 'CAMERA']
+    print("All cameras in scene:")
+    if not cams:
+        raise RuntimeError("No camera objects found in the scene")
+    for c in cams:
+        print(f"  {c.name} - type: {c.type}")
+    cam = cams[0]
+    
+    print('cam', cam)
+    print('cam.type', cam.type)  # should be 'CAMERA'
+    print('cam_data', cam.data)  # should not be None
+    print(f"Using camera: {cam.name}")
+
+    cam_data = cam.data
+    
+    exr_img = cv2.imread(input_exr, cv2.IMREAD_UNCHANGED)
+    if exr_img is None:
+        raise RuntimeError(f"Failed to load EXR file: {input_exr}")
+
+    print(f"EXR shape: {exr_img.shape}, dtype: {exr_img.dtype}")
+
+    depth_channel = exr_img[:, :, 0] if exr_img.ndim == 3 else exr_img
+
+    # filter 
+    depth_channel = depth_channel.copy()
+    depth_channel[depth_channel > 1e9] = 0
+
+    extrinsic_matrix = np.array(cam.matrix_world.copy())
+
+    scene = bpy.context.scene
+    render = scene.render
+    cam_data = cam.data
+
+    resolution_x = render.resolution_x * render.pixel_aspect_x
+    resolution_y = render.resolution_y * render.pixel_aspect_y
+
+    cx = resolution_x / 2.0
+    cy = resolution_y / 2.0
+
+    if cam_data.type == 'ORTHO':
+        aspect_ratio = render.resolution_x / render.resolution_y
+        ortho_scale = cam_data.ortho_scale
+        near = cam_data.clip_start
+        far = cam_data.clip_end
+
+        left = -ortho_scale / 2
+        right = ortho_scale / 2
+        top = (ortho_scale / 2) / aspect_ratio
+        bottom = -top
+
+        proj_matrix = np.array((
+            (2/(right-left), 0, 0, -(right+left)/(right-left)),
+            (0, 2/(top-bottom), 0, -(top+bottom)/(top-bottom)),
+            (0, 0, -2/(far-near), -(far+near)/(far-near)),
+            (0, 0, 0, 1)
+        ))
+    else:
+        if cam_data.sensor_fit == 'VERTICAL':
+            sensor_size = cam_data.sensor_height
+            fit = 'VERTICAL'
+        else:
+            sensor_size = cam_data.sensor_width
+            fit = 'HORIZONTAL'
+
+        focal_length = cam_data.lens
+
+        if fit == 'HORIZONTAL':
+            scale = resolution_x / sensor_size
+        else:
+            scale = resolution_y / sensor_size
+
+        fx = focal_length * scale
+        fy = focal_length * scale
+
+        K = np.array([
+            [fx, 0,  cx],
+            [0,  fy, cy],
+            [0,  0,   1]
+        ])
+
+    mask = (depth_channel.reshape(-1) == 0)
+    jj, ii = np.meshgrid(np.arange(resolution_x), np.arange(resolution_y))
+    jj = jj + 0.5
+    ii = ii + 0.5
+
+    if cam_data.type == 'ORTHO':
+        cam_pos = np.stack((
+            (jj - cx) * (1.0 / (resolution_x - 1) * ortho_scale),
+            (ii - cy) * (1.0 / (resolution_y - 1) * ortho_scale),
+            depth_channel
+        ), axis=-1)
+    else:
+        image_pos = np.stack((jj * depth_channel, ii * depth_channel, depth_channel), axis=-1)
+        cam_pos = image_pos @ np.linalg.inv(K).T
+
+    cam_pos[..., 1:] = -cam_pos[..., 1:]
+
+    world_pos = cam_pos @ extrinsic_matrix[:3, :3].T + extrinsic_matrix[:3, 3].reshape(1, 1, 3)
+    world_pos = world_pos.reshape(-1, 3)
+    world_pos[mask] = 0
+    world_pos = world_pos.reshape(cam_pos.shape)
+    world_pos = np.stack((world_pos[..., 0], world_pos[..., 2], -world_pos[..., 1]), axis=-1)
+
+    img_out = np.clip((0.5 + world_pos) * 255, 0, 255).astype('uint8')
+    cv2.imwrite(output_png, img_out)
+    print(f"Saved depth map to {output_png}")
+
+
+def init_render(engine='CYCLES', resolution=512, geo_mode=False):
+    bpy.context.scene.render.engine = engine
+    bpy.context.scene.render.resolution_x = resolution
+    bpy.context.scene.render.resolution_y = resolution
+    bpy.context.scene.render.resolution_percentage = 100
+    bpy.context.scene.render.image_settings.file_format = 'PNG'
+    bpy.context.scene.render.image_settings.color_mode = 'RGBA'
+    bpy.context.scene.render.film_transparent = True
+    
+    bpy.context.scene.cycles.device = 'GPU'
+    #bpy.context.scene.cycles.samples = 128 if not geo_mode else 1
+    bpy.context.scene.cycles.filter_type = 'BOX'
+    bpy.context.scene.cycles.filter_width = 1
+    bpy.context.scene.cycles.diffuse_bounces = 1
+    bpy.context.scene.cycles.glossy_bounces = 1
+    # bpy.context.scene.cycles.transparent_max_bounces = 3 if not geo_mode else 0
+    # bpy.context.scene.cycles.transmission_bounces = 3 if not geo_mode else 1
+    bpy.context.scene.cycles.use_denoising = True
+        
+    bpy.context.preferences.addons['cycles'].preferences.get_devices()
+    # bpy.context.preferences.addons['cycles'].preferences.compute_device_type = 'CUDA'
+    
+def init_nodes(save_depth=False, save_normal=False, save_albedo=False, save_mr = False, save_mist=False):
+    if not any([save_depth, save_normal, save_albedo, save_mist]):
+        return {}, {}, []
+    outputs = {}
+    spec_nodes = {}
+    composite_nodes = []
+    bpy.context.scene.use_nodes = True
+    bpy.context.scene.view_layers['ViewLayer'].use_pass_z = save_depth
+    bpy.context.scene.view_layers['ViewLayer'].use_pass_normal = save_normal
+    bpy.context.scene.view_layers['ViewLayer'].use_pass_diffuse_color = save_albedo
+    bpy.context.scene.view_layers['ViewLayer'].use_pass_mist = save_mist
+    
+    nodes = bpy.context.scene.node_tree.nodes
+    links = bpy.context.scene.node_tree.links
+    for n in nodes:
+        nodes.remove(n)
+    
+    render_layers = nodes.new('CompositorNodeRLayers')
+    
+    if save_depth:
+        depth_file_output = nodes.new('CompositorNodeOutputFile')
+        depth_file_output.base_path = ''
+        depth_file_output.file_slots[0].use_node_format = True
+        depth_file_output.format.file_format = "OPEN_EXR"
+        links.new(render_layers.outputs['Depth'], depth_file_output.inputs[0])
+        
+        outputs['depth'] = depth_file_output
+        composite_nodes.append((render_layers.outputs['Depth'], depth_file_output.inputs[0]))
+    
+    if save_normal:
+        normal_file_output = nodes.new('CompositorNodeOutputFile')
+        normal_file_output.base_path = ''
+        normal_file_output.file_slots[0].use_node_format = True
+        normal_file_output.format.file_format = 'OPEN_EXR'
+        links.new(render_layers.outputs['Normal'], normal_file_output.inputs[0])
+        
+        outputs['normal'] = normal_file_output
+        composite_nodes.append((render_layers.outputs['Normal'], normal_file_output.inputs[0]))
+    
+    if save_albedo:
+        albedo_file_output = nodes.new('CompositorNodeOutputFile')
+        albedo_file_output.base_path = ''
+        albedo_file_output.file_slots[0].use_node_format = True
+        albedo_file_output.format.file_format = 'PNG'
+        albedo_file_output.format.color_mode = 'RGBA'
+        albedo_file_output.format.color_depth = '8'
+        
+        alpha_albedo = nodes.new('CompositorNodeSetAlpha')
+        
+        links.new(render_layers.outputs['DiffCol'], alpha_albedo.inputs['Image'])
+        links.new(render_layers.outputs['Alpha'], alpha_albedo.inputs['Alpha'])
+        links.new(alpha_albedo.outputs['Image'], albedo_file_output.inputs[0])
+        
+        outputs['albedo'] = albedo_file_output
+        #composite_nodes.append((alpha_albedo.outputs['Image'], albedo_file_output.inputs[0]))
+
+    if save_mr:
+        mr_file_output = tree.nodes.new(type='CompositorNodeOutputFile')
+        mr_file_output.base_path = ''
+        mr_file_output.file_slots[0].use_node_format = True
+        mr_file_output.format.file_format = 'OPEN_EXR'
+        
+        links.new(render_layers.outputs['Image'], mr_file_output.inputs[0])
+
+        outputs['mr'] = mr_file_output
+        composite_nodes.append((render_layers.outputs['Image'], mr_file_output.inputs[0]))
+        
+    if save_mist:
+        bpy.data.worlds['World'].mist_settings.start = 0
+        bpy.data.worlds['World'].mist_settings.depth = 10
+        
+        mist_file_output = nodes.new('CompositorNodeOutputFile')
+        mist_file_output.base_path = ''
+        mist_file_output.file_slots[0].use_node_format = True
+        mist_file_output.format.file_format = 'PNG'
+        mist_file_output.format.color_mode = 'BW'
+        mist_file_output.format.color_depth = '16'
+        
+        links.new(render_layers.outputs['Mist'], mist_file_output.inputs[0])
+        
+        outputs['mist'] = mist_file_output
+        composite_nodes.append((render_layers.outputs['Mist'], mist_file_output.inputs[0]))
+
+    return outputs, spec_nodes, composite_nodes
+
+def init_scene() -> None:
+    """Resets the scene to a clean state.
+
+    Returns:
+        None
+    """
+    # delete everything
+    for obj in bpy.data.objects:
+        bpy.data.objects.remove(obj, do_unlink=True)
+
+    # delete all the materials
+    for material in bpy.data.materials:
+        bpy.data.materials.remove(material, do_unlink=True)
+
+    # delete all the textures
+    for texture in bpy.data.textures:
+        bpy.data.textures.remove(texture, do_unlink=True)
+
+    # delete all the images
+    for image in bpy.data.images:
+        bpy.data.images.remove(image, do_unlink=True)
+
+def init_camera():
+    cam = bpy.data.objects.new('Camera', bpy.data.cameras.new('Camera'))
+    bpy.context.collection.objects.link(cam)
+    bpy.context.scene.camera = cam
+    cam.data.sensor_height = cam.data.sensor_width = 32
+    cam_constraint = cam.constraints.new(type='TRACK_TO')
+    cam_constraint.track_axis = 'TRACK_NEGATIVE_Z'
+    cam_constraint.up_axis = 'UP_Y'
+    cam_empty = bpy.data.objects.new("Empty", None)
+    cam_empty.location = (0, 0, 0)
+    bpy.context.scene.collection.objects.link(cam_empty)
+    cam_constraint.target = cam_empty
+    return cam
+
+def init_lighting():
+    # Clear existing lights
+    bpy.ops.object.select_all(action="DESELECT")
+    bpy.ops.object.select_by_type(type="LIGHT")
+    bpy.ops.object.delete()
+    
+    # Create key light
+    default_light = bpy.data.objects.new("Default_Light", bpy.data.lights.new("Default_Light", type="POINT"))
+    bpy.context.collection.objects.link(default_light)
+    default_light.data.energy = 1000
+    default_light.location = (4, 1, 6)
+    default_light.rotation_euler = (0, 0, 0)
+    
+    # create top light
+    top_light = bpy.data.objects.new("Top_Light", bpy.data.lights.new("Top_Light", type="AREA"))
+    bpy.context.collection.objects.link(top_light)
+    top_light.data.energy = 10000
+    top_light.location = (0, 0, 10)
+    top_light.scale = (100, 100, 100)
+    
+    # create bottom light
+    bottom_light = bpy.data.objects.new("Bottom_Light", bpy.data.lights.new("Bottom_Light", type="AREA"))
+    bpy.context.collection.objects.link(bottom_light)
+    bottom_light.data.energy = 1000
+    bottom_light.location = (0, 0, -10)
+    bottom_light.rotation_euler = (0, 0, 0)
+    
+    return {
+        "default_light": default_light,
+        "top_light": top_light,
+        "bottom_light": bottom_light
+    }
+
+
+def load_object(object_path: str) -> None:
+    """Loads a model with a supported file extension into the scene.
+
+    Args:
+        object_path (str): Path to the model file.
+
+    Raises:
+        ValueError: If the file extension is not supported.
+
+    Returns:
+        None
+    """
+    file_extension = object_path.split(".")[-1].lower()
+    if file_extension is None:
+        raise ValueError(f"Unsupported file type: {object_path}")
+
+    if file_extension == "usdz":
+        # install usdz io package
+        dirname = os.path.dirname(os.path.realpath(__file__))
+        usdz_package = os.path.join(dirname, "io_scene_usdz.zip")
+        bpy.ops.preferences.addon_install(filepath=usdz_package)
+        # enable it
+        addon_name = "io_scene_usdz"
+        bpy.ops.preferences.addon_enable(module=addon_name)
+        # import the usdz
+        from io_scene_usdz.import_usdz import import_usdz
+
+        import_usdz(context, filepath=object_path, materials=True, animations=True)
+        return None
+
+    # load from existing import functions
+    import_function = IMPORT_FUNCTIONS[file_extension]
+
+    print(f"Loading object from {object_path}")
+    if file_extension == "blend":
+        import_function(directory=object_path, link=False)
+    elif file_extension in {"glb", "gltf"}:
+        import_function(filepath=object_path, merge_vertices=True, import_shading='NORMALS')
+    else:
+        import_function(filepath=object_path)
+        
+def delete_invisible_objects() -> None:
+    """Deletes all invisible objects in the scene.
+
+    Returns:
+        None
+    """
+    # bpy.ops.object.mode_set(mode="OBJECT")
+    bpy.ops.object.select_all(action="DESELECT")
+    for obj in bpy.context.scene.objects:
+        if obj.hide_viewport or obj.hide_render:
+            obj.hide_viewport = False
+            obj.hide_render = False
+            obj.hide_select = False
+            obj.select_set(True)
+    bpy.ops.object.delete()
+
+    # Delete invisible collections
+    invisible_collections = [col for col in bpy.data.collections if col.hide_viewport]
+    for col in invisible_collections:
+        bpy.data.collections.remove(col)
+        
+def split_mesh_normal():
+    bpy.ops.object.select_all(action="DESELECT")
+    objs = [obj for obj in bpy.context.scene.objects if obj.type == "MESH"]
+    bpy.context.view_layer.objects.active = objs[0]
+    for obj in objs:
+        obj.select_set(True)
+    bpy.ops.object.mode_set(mode="EDIT")
+    bpy.ops.mesh.select_all(action='SELECT')
+    bpy.ops.mesh.split_normals()
+    bpy.ops.object.mode_set(mode='OBJECT')
+    bpy.ops.object.select_all(action="DESELECT")
+            
+def delete_custom_normals():
+    for this_obj in bpy.data.objects:
+        if this_obj.type == "MESH":
+            bpy.context.view_layer.objects.active = this_obj
+            bpy.ops.mesh.customdata_custom_splitnormals_clear()
+
+def override_material():
+    new_mat = bpy.data.materials.new(name="Override0123456789")
+    new_mat.use_nodes = True
+    new_mat.node_tree.nodes.clear()
+    bsdf = new_mat.node_tree.nodes.new('ShaderNodeBsdfDiffuse')
+    bsdf.inputs[0].default_value = (0.5, 0.5, 0.5, 1)
+    bsdf.inputs[1].default_value = 1
+    output = new_mat.node_tree.nodes.new('ShaderNodeOutputMaterial')
+    new_mat.node_tree.links.new(bsdf.outputs['BSDF'], output.inputs['Surface'])
+    bpy.context.scene.view_layers['ViewLayer'].material_override = new_mat
+
+def unhide_all_objects() -> None:
+    """Unhides all objects in the scene.
+
+    Returns:
+        None
+    """
+    for obj in bpy.context.scene.objects:
+        obj.hide_set(False)
+        
+def convert_to_meshes() -> None:
+    """Converts all objects in the scene to meshes.
+
+    Returns:
+        None
+    """
+    bpy.ops.object.select_all(action="DESELECT")
+    bpy.context.view_layer.objects.active = [obj for obj in bpy.context.scene.objects if obj.type == "MESH"][0]
+    for obj in bpy.context.scene.objects:
+        obj.select_set(True)
+    bpy.ops.object.convert(target="MESH")
+        
+def triangulate_meshes() -> None:
+    """Triangulates all meshes in the scene.
+
+    Returns:
+        None
+    """
+    bpy.ops.object.select_all(action="DESELECT")
+    objs = [obj for obj in bpy.context.scene.objects if obj.type == "MESH"]
+    bpy.context.view_layer.objects.active = objs[0]
+    for obj in objs:
+        obj.select_set(True)
+    bpy.ops.object.mode_set(mode="EDIT")
+    bpy.ops.mesh.reveal()
+    bpy.ops.mesh.select_all(action="SELECT")
+    bpy.ops.mesh.quads_convert_to_tris(quad_method="BEAUTY", ngon_method="BEAUTY")
+    bpy.ops.object.mode_set(mode="OBJECT")
+    bpy.ops.object.select_all(action="DESELECT")
+
+def scene_bbox() -> Tuple[Vector, Vector]:
+    """Returns the bounding box of the scene.
+
+    Taken from Shap-E rendering script
+    (https://github.com/openai/shap-e/blob/main/shap_e/rendering/blender/blender_script.py#L68-L82)
+
+    Returns:
+        Tuple[Vector, Vector]: The minimum and maximum coordinates of the bounding box.
+    """
+    bbox_min = (math.inf,) * 3
+    bbox_max = (-math.inf,) * 3
+    found = False
+    scene_meshes = [obj for obj in bpy.context.scene.objects.values() if isinstance(obj.data, bpy.types.Mesh)]
+    for obj in scene_meshes:
+        found = True
+        for coord in obj.bound_box:
+            coord = Vector(coord)
+            coord = obj.matrix_world @ coord
+            bbox_min = tuple(min(x, y) for x, y in zip(bbox_min, coord))
+            bbox_max = tuple(max(x, y) for x, y in zip(bbox_max, coord))
+    if not found:
+        raise RuntimeError("no objects in scene to compute bounding box for")
+    return Vector(bbox_min), Vector(bbox_max)
+
+def normalize_scene() -> Tuple[float, Vector]:
+    """Normalizes the scene by scaling and translating it to fit in a unit cube centered
+    at the origin.
+
+    Mostly taken from the Point-E / Shap-E rendering script
+    (https://github.com/openai/point-e/blob/main/point_e/evals/scripts/blender_script.py#L97-L112),
+    but fix for multiple root objects: (see bug report here:
+    https://github.com/openai/shap-e/pull/60).
+
+    Returns:
+        Tuple[float, Vector]: The scale factor and the offset applied to the scene.
+    """
+    scene_root_objects = [obj for obj in bpy.context.scene.objects.values() if not obj.parent]
+    if len(scene_root_objects) > 1:
+        # create an empty object to be used as a parent for all root objects
+        scene = bpy.data.objects.new("ParentEmpty", None)
+        bpy.context.scene.collection.objects.link(scene)
+
+        # parent all root objects to the empty object
+        for obj in scene_root_objects:
+            obj.parent = scene
+    else:
+        scene = scene_root_objects[0]
+
+    bbox_min, bbox_max = scene_bbox()
+    scale = 1 / max(bbox_max - bbox_min)
+    scene.scale = scene.scale * scale
+
+    # Apply scale to matrix_world.
+    bpy.context.view_layer.update()
+    bbox_min, bbox_max = scene_bbox()
+    offset = -(bbox_min + bbox_max) / 2
+    scene.matrix_world.translation += offset
+    bpy.ops.object.select_all(action="DESELECT")
+    
+    return scale, offset
+
+def get_transform_matrix(obj: bpy.types.Object) -> list:
+    pos, rt, _ = obj.matrix_world.decompose()
+    rt = rt.to_matrix()
+    matrix = []
+    for ii in range(3):
+        a = []
+        for jj in range(3):
+            a.append(rt[ii][jj])
+        a.append(pos[ii])
+        matrix.append(a)
+    matrix.append([0, 0, 0, 1])
+    return matrix
+
+    
+def main(arg):
+    os.makedirs(arg.output_folder, exist_ok=True)
+
+    if arg.geo_mode:
+        views = trellis_cond_camera_sequence(arg.views)
+        arg.save_mesh = True
+    else:
+        views = orthogonal_camera_sequence()
+        arg.save_albedo = True
+        arg.save_mr = True
+        arg.save_normal = True
+        arg.save_depth = True
+        arg.save_mesh = False
+    
+    # Initialize context
+    init_render(engine=arg.engine, resolution=arg.resolution, geo_mode=arg.geo_mode)
+    outputs, spec_nodes, composite_nodes = init_nodes(
+        save_depth=arg.save_depth,
+        save_normal=arg.save_normal,
+        save_albedo=arg.save_albedo,
+        save_mist=arg.save_mist
+    )
+    if arg.object.endswith(".blend"):
+        delete_invisible_objects()
+    else:
+        init_scene()
+        load_object(arg.object)
+        if arg.split_normal:
+            split_mesh_normal()
+        # delete_custom_normals()
+    print('[INFO] Scene initialized.')
+    
+    # normalize scene
+    scale, offset = normalize_scene()
+    print('[INFO] Scene normalized.')
+    
+    # Initialize camera and lighting
+    cam = init_camera()
+    init_lighting()
+    print('[INFO] Camera and lighting initialized.')
+
+    # Override material
+    #if arg.geo_mode:
+    #    override_material()
+    
+    # Create a list of views
+    to_export = {
+        "aabb": [[-0.5, -0.5, -0.5], [0.5, 0.5, 0.5]],
+        "scale": scale,
+        "offset": [offset.x, offset.y, offset.z],
+        "frames": []
+    }
+
+    for i, view in enumerate(views):
+        cam.location = (
+            view['cam_dis'] * np.cos(view['hangle']) * np.cos(view['vangle']),
+            view['cam_dis'] * np.sin(view['hangle']) * np.cos(view['vangle']),
+            view['cam_dis'] * np.sin(view['vangle'])
+        )
+        cam.data.lens = 16 / np.tan(view['fov'] / 2)
+        
+        if view['proj_type'] == 1:
+            cam.data.type = "ORTHO"
+            cam.data.ortho_scale = 1.2
+
+        bpy.context.scene.render.filepath = os.path.join(arg.output_folder, f'{i:03d}.png')
+        for name, output in outputs.items():
+            output.file_slots[0].path = os.path.join(arg.output_folder, f'{i:03d}_{name}')
+            
+        # Render the scene
+        if not arg.geo_mode:
+            switch_to_mr_render(False, composite_nodes)
+            bpy.ops.render.render(write_still=True)
+            shutil.copyfile(bpy.context.scene.render.filepath, 
+                            bpy.context.scene.render.filepath.replace('.png', '_mr.png'))
+            switch_to_color_render(composite_nodes)
+
+        bpy.ops.render.render(write_still=True)
+        bpy.context.view_layer.update()
+        for name, output in outputs.items():
+            ext = EXT[output.format.file_format]
+            path = glob.glob(f'{output.file_slots[0].path}*.{ext}')[0]
+            os.rename(path, f'{output.file_slots[0].path}.{ext}')
+        
+        if not arg.geo_mode:
+            ConvertNormalMap(os.path.join(arg.output_folder, f'{i:03d}_normal.exr'), 
+                             os.path.join(arg.output_folder, f'{i:03d}_normal.jpg'))
+            ConvertDepthMap(os.path.join(arg.output_folder, f'{i:03d}_depth.exr'), 
+                            os.path.join(arg.output_folder, f'{i:03d}_pos.jpg'))
+            os.remove(os.path.join(arg.output_folder, f'{i:03d}_normal.exr'))
+            os.remove(os.path.join(arg.output_folder, f'{i:03d}_depth.exr'))
+
+        # Save camera parameters
+        metadata = {
+            "file_path": f'{i:03d}.png',
+            "camera_angle_x": view['fov'],
+            'proj_type': view['proj_type'],
+            'azimuth': view['hangle'],
+            'elevation': view['vangle'],
+            'cam_dis': view['cam_dis'],
+            "transform_matrix": get_transform_matrix(cam)
+        }
+        to_export["frames"].append(metadata)
+
+    # Save the camera parameters
+    transform_path = os.path.join(arg.output_folder, 'transforms.json')
+    with open(transform_path, 'w') as f:
+        json.dump(to_export, f, indent=4)
+        
+    if arg.save_mesh:
+        # triangulate meshes
+        unhide_all_objects()
+        convert_to_meshes()
+        triangulate_meshes()
+        print('[INFO] Meshes triangulated.')
+        
+        # export ply mesh
+        bpy.ops.wm.ply_export(filepath=os.path.join(arg.output_folder, 'mesh.ply'), 
+                              export_triangulated_mesh=True, up_axis='Y', 
+                              forward_axis='NEGATIVE_Z')
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser(description='Renders given obj file by rotation a camera around it.')
+    parser.add_argument('--views', type=int, default=24, 
+        help='JSON string of views. Contains a list of {yaw, pitch, radius, fov} object.')
+    parser.add_argument('--object', type=str, 
+        help='Path to the 3D model file to be rendered.')
+    parser.add_argument('--output_folder', type=str, default='/tmp', 
+        help='The path the output will be dumped to.')
+    parser.add_argument('--resolution', type=int, default=512, 
+        help='Resolution of the images.')
+    parser.add_argument('--engine', type=str, default='CYCLES', 
+        help='Blender internal engine for rendering. E.g. CYCLES, BLENDER_EEVEE, ...')
+    parser.add_argument('--geo_mode', action='store_true', 
+        help='Geometry mode for rendering.')
+    parser.add_argument('--save_depth', action='store_true', 
+        help='Save the depth maps.')
+    parser.add_argument('--save_normal', action='store_true', 
+        help='Save the normal maps.')
+    parser.add_argument('--save_albedo', action='store_true', 
+        help='Save the albedo maps.')
+    parser.add_argument('--save_mr', action='store_true', 
+        help='Save the MR maps.')
+    parser.add_argument('--save_mist', action='store_true', 
+        help='Save the mist distance maps.')
+    parser.add_argument('--split_normal', action='store_true', 
+        help='Split the normals of the mesh.')
+    parser.add_argument('--save_mesh', action='store_true', 
+        help='Save the mesh as a .ply file.')
+    argv = sys.argv[sys.argv.index("--") + 1:]
+    args = parser.parse_args(argv)
+
+    main(args)