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pytorch3d/docs/tutorials/render_textured_meshes.ipynb
Jeremy Reizenstein 741777b5b5 More company name & License 
Summary: Manual adjustments for license changes.

Reviewed By: patricklabatut

Differential Revision: D33405657

fbshipit-source-id: 8a21735726f3aece9f9164da9e3b272b27db8032
2022-01-04 11:43:38 -08:00

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{
"cells": [
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"colab": {},
"colab_type": "code",
"id": "_Ip8kp4TfBLZ"
},
"outputs": [],
"source": [
"# Copyright (c) Meta Platforms, Inc. and affiliates. All rights reserved."
]
},
{
"cell_type": "markdown",
"metadata": {
"colab_type": "text",
"id": "kuXHJv44fBLe"
},
"source": [
"# Render a textured mesh\n",
"\n",
"This tutorial shows how to:\n",
"- load a mesh and textures from an `.obj` file. \n",
"- set up a renderer \n",
"- render the mesh \n",
"- vary the rendering settings such as lighting and camera position\n",
"- use the batching features of the pytorch3d API to render the mesh from different viewpoints"
]
},
{
"cell_type": "markdown",
"metadata": {
"colab_type": "text",
"id": "Bnj3THhzfBLf"
},
"source": [
"## 0. Install and Import modules"
]
},
{
"cell_type": "markdown",
"metadata": {
"colab_type": "text",
"id": "okLalbR_g7NS"
},
"source": [
"Ensure `torch` and `torchvision` are installed. If `pytorch3d` is not installed, install it using the following cell:"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"colab": {
"base_uri": "https://localhost:8080/",
"height": 717
},
"colab_type": "code",
"id": "musUWTglgxSB",
"outputId": "16d1a1b2-3f7f-43ed-ca28-a4d236cc0572"
},
"outputs": [],
"source": [
"import os\n",
"import sys\n",
"import torch\n",
"need_pytorch3d=False\n",
"try:\n",
" import pytorch3d\n",
"except ModuleNotFoundError:\n",
" need_pytorch3d=True\n",
"if need_pytorch3d:\n",
" if torch.__version__.startswith(\"1.10.\") and sys.platform.startswith(\"linux\"):\n",
" # We try to install PyTorch3D via a released wheel.\n",
" pyt_version_str=torch.__version__.split(\"+\")[0].replace(\".\", \"\")\n",
" version_str=\"\".join([\n",
" f\"py3{sys.version_info.minor}_cu\",\n",
" torch.version.cuda.replace(\".\",\"\"),\n",
" f\"_pyt{pyt_version_str}\"\n",
" ])\n",
" !pip install pytorch3d -f https://dl.fbaipublicfiles.com/pytorch3d/packaging/wheels/{version_str}/download.html\n",
" else:\n",
" # We try to install PyTorch3D from source.\n",
" !curl -LO https://github.com/NVIDIA/cub/archive/1.10.0.tar.gz\n",
" !tar xzf 1.10.0.tar.gz\n",
" os.environ[\"CUB_HOME\"] = os.getcwd() + \"/cub-1.10.0\"\n",
" !pip install 'git+https://github.com/facebookresearch/pytorch3d.git@stable'"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"colab": {},
"colab_type": "code",
"id": "nX99zdoffBLg"
},
"outputs": [],
"source": [
"import os\n",
"import torch\n",
"import matplotlib.pyplot as plt\n",
"\n",
"# Util function for loading meshes\n",
"from pytorch3d.io import load_objs_as_meshes, load_obj\n",
"\n",
"# Data structures and functions for rendering\n",
"from pytorch3d.structures import Meshes\n",
"from pytorch3d.vis.plotly_vis import AxisArgs, plot_batch_individually, plot_scene\n",
"from pytorch3d.vis.texture_vis import texturesuv_image_matplotlib\n",
"from pytorch3d.renderer import (\n",
" look_at_view_transform,\n",
" FoVPerspectiveCameras, \n",
" PointLights, \n",
" DirectionalLights, \n",
" Materials, \n",
" RasterizationSettings, \n",
" MeshRenderer, \n",
" MeshRasterizer, \n",
" SoftPhongShader,\n",
" TexturesUV,\n",
" TexturesVertex\n",
")\n",
"\n",
"# add path for demo utils functions \n",
"import sys\n",
"import os\n",
"sys.path.append(os.path.abspath(''))"
]
},
{
"cell_type": "markdown",
"metadata": {
"colab_type": "text",
"id": "Lxmehq6Zhrzv"
},
"source": [
"If using **Google Colab**, fetch the utils file for plotting image grids:"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"colab": {
"base_uri": "https://localhost:8080/",
"height": 204
},
"colab_type": "code",
"id": "HZozr3Pmho-5",
"outputId": "be5eb60d-5f65-4db1-cca0-44ee68c8f5fd"
},
"outputs": [],
"source": [
"!wget https://raw.githubusercontent.com/facebookresearch/pytorch3d/main/docs/tutorials/utils/plot_image_grid.py\n",
"from plot_image_grid import image_grid"
]
},
{
"cell_type": "markdown",
"metadata": {
"colab_type": "text",
"id": "g4B62MzYiJUM"
},
"source": [
"OR if running **locally** uncomment and run the following cell:"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"colab": {},
"colab_type": "code",
"id": "paJ4Im8ahl7O"
},
"outputs": [],
"source": [
"# from utils import image_grid"
]
},
{
"cell_type": "markdown",
"metadata": {
"colab_type": "text",
"id": "5jGq772XfBLk"
},
"source": [
"### 1. Load a mesh and texture file\n",
"\n",
"Load an `.obj` file and its associated `.mtl` file and create a **Textures** and **Meshes** object. \n",
"\n",
"**Meshes** is a unique datastructure provided in PyTorch3D for working with batches of meshes of different sizes. \n",
"\n",
"**TexturesUV** is an auxiliary datastructure for storing vertex uv and texture maps for meshes. \n",
"\n",
"**Meshes** has several class methods which are used throughout the rendering pipeline."
]
},
{
"cell_type": "markdown",
"metadata": {
"colab_type": "text",
"id": "a8eU4zo5jd_H"
},
"source": [
"If running this notebook using **Google Colab**, run the following cell to fetch the mesh obj and texture files and save it at the path `data/cow_mesh`:\n",
"If running locally, the data is already available at the correct path. "
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"colab": {
"base_uri": "https://localhost:8080/",
"height": 578
},
"colab_type": "code",
"id": "tTm0cVuOjb1W",
"outputId": "6cd7e2ec-65e1-4dcc-99e8-c347bc504f0a"
},
"outputs": [],
"source": [
"!mkdir -p data/cow_mesh\n",
"!wget -P data/cow_mesh https://dl.fbaipublicfiles.com/pytorch3d/data/cow_mesh/cow.obj\n",
"!wget -P data/cow_mesh https://dl.fbaipublicfiles.com/pytorch3d/data/cow_mesh/cow.mtl\n",
"!wget -P data/cow_mesh https://dl.fbaipublicfiles.com/pytorch3d/data/cow_mesh/cow_texture.png"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"colab": {},
"colab_type": "code",
"id": "gi5Kd0GafBLl"
},
"outputs": [],
"source": [
"# Setup\n",
"if torch.cuda.is_available():\n",
" device = torch.device(\"cuda:0\")\n",
" torch.cuda.set_device(device)\n",
"else:\n",
" device = torch.device(\"cpu\")\n",
"\n",
"# Set paths\n",
"DATA_DIR = \"./data\"\n",
"obj_filename = os.path.join(DATA_DIR, \"cow_mesh/cow.obj\")\n",
"\n",
"# Load obj file\n",
"mesh = load_objs_as_meshes([obj_filename], device=device)"
]
},
{
"cell_type": "markdown",
"metadata": {
"colab_type": "text",
"id": "5APAQs6-fBLp"
},
"source": [
"#### Let's visualize the texture map"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"colab": {
"base_uri": "https://localhost:8080/",
"height": 428
},
"colab_type": "code",
"id": "YipUhrIHfBLq",
"outputId": "48987b1d-5cc1-4c2a-cb3c-713d64f6a38d"
},
"outputs": [],
"source": [
"plt.figure(figsize=(7,7))\n",
"texture_image=mesh.textures.maps_padded()\n",
"plt.imshow(texture_image.squeeze().cpu().numpy())\n",
"plt.axis(\"off\");"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"PyTorch3D has a built-in way to view the texture map with matplotlib along with the points on the map corresponding to vertices. There is also a method, texturesuv_image_PIL, to get a similar image which can be saved to a file."
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"plt.figure(figsize=(7,7))\n",
"texturesuv_image_matplotlib(mesh.textures, subsample=None)\n",
"plt.axis(\"off\");"
]
},
{
"cell_type": "markdown",
"metadata": {
"colab_type": "text",
"id": "GcnG6XJ6fBLu"
},
"source": [
"## 2. Create a renderer\n",
"\n",
"A renderer in PyTorch3D is composed of a **rasterizer** and a **shader** which each have a number of subcomponents such as a **camera** (orthographic/perspective). Here we initialize some of these components and use default values for the rest.\n",
"\n",
"In this example we will first create a **renderer** which uses a **perspective camera**, a **point light** and applies **Phong shading**. Then we learn how to vary different components using the modular API. "
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"colab": {},
"colab_type": "code",
"id": "dX466mWnfBLv"
},
"outputs": [],
"source": [
"# Initialize a camera.\n",
"# With world coordinates +Y up, +X left and +Z in, the front of the cow is facing the -Z direction. \n",
"# So we move the camera by 180 in the azimuth direction so it is facing the front of the cow. \n",
"R, T = look_at_view_transform(2.7, 0, 180) \n",
"cameras = FoVPerspectiveCameras(device=device, R=R, T=T)\n",
"\n",
"# Define the settings for rasterization and shading. Here we set the output image to be of size\n",
"# 512x512. As we are rendering images for visualization purposes only we will set faces_per_pixel=1\n",
"# and blur_radius=0.0. We also set bin_size and max_faces_per_bin to None which ensure that \n",
"# the faster coarse-to-fine rasterization method is used. Refer to rasterize_meshes.py for \n",
"# explanations of these parameters. Refer to docs/notes/renderer.md for an explanation of \n",
"# the difference between naive and coarse-to-fine rasterization. \n",
"raster_settings = RasterizationSettings(\n",
" image_size=512, \n",
" blur_radius=0.0, \n",
" faces_per_pixel=1, \n",
")\n",
"\n",
"# Place a point light in front of the object. As mentioned above, the front of the cow is facing the \n",
"# -z direction. \n",
"lights = PointLights(device=device, location=[[0.0, 0.0, -3.0]])\n",
"\n",
"# Create a Phong renderer by composing a rasterizer and a shader. The textured Phong shader will \n",
"# interpolate the texture uv coordinates for each vertex, sample from a texture image and \n",
"# apply the Phong lighting model\n",
"renderer = MeshRenderer(\n",
" rasterizer=MeshRasterizer(\n",
" cameras=cameras, \n",
" raster_settings=raster_settings\n",
" ),\n",
" shader=SoftPhongShader(\n",
" device=device, \n",
" cameras=cameras,\n",
" lights=lights\n",
" )\n",
")"
]
},
{
"cell_type": "markdown",
"metadata": {
"colab_type": "text",
"id": "KyOY5qXvfBLz"
},
"source": [
"## 3. Render the mesh"
]
},
{
"cell_type": "markdown",
"metadata": {
"colab_type": "text",
"id": "8VkRA4qJfBL0"
},
"source": [
"The light is in front of the object so it is bright and the image has specular highlights."
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"colab": {
"base_uri": "https://localhost:8080/",
"height": 592
},
"colab_type": "code",
"id": "gBLZH8iUfBL1",
"outputId": "cc3cd3f0-189e-4497-ce47-e64b4da542e8"
},
"outputs": [],
"source": [
"images = renderer(mesh)\n",
"plt.figure(figsize=(10, 10))\n",
"plt.imshow(images[0, ..., :3].cpu().numpy())\n",
"plt.axis(\"off\");"
]
},
{
"cell_type": "markdown",
"metadata": {
"colab_type": "text",
"id": "k161XF3sfBL5"
},
"source": [
"## 4. Move the light behind the object and re-render\n",
"\n",
"We can pass arbitrary keyword arguments to the `rasterizer`/`shader` via the call to the `renderer` so the renderer does not need to be reinitialized if any of the settings change/\n",
"\n",
"In this case, we can simply update the location of the lights and pass them into the call to the renderer. \n",
"\n",
"The image is now dark as there is only ambient lighting, and there are no specular highlights."
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"colab": {},
"colab_type": "code",
"id": "BdWkkeibfBL6"
},
"outputs": [],
"source": [
"# Now move the light so it is on the +Z axis which will be behind the cow. \n",
"lights.location = torch.tensor([0.0, 0.0, +1.0], device=device)[None]\n",
"images = renderer(mesh, lights=lights)"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"colab": {
"base_uri": "https://localhost:8080/",
"height": 592
},
"colab_type": "code",
"id": "UmV3j1YffBL9",
"outputId": "2e8edca0-5bd8-4a2f-a160-83c4b0520123"
},
"outputs": [],
"source": [
"plt.figure(figsize=(10, 10))\n",
"plt.imshow(images[0, ..., :3].cpu().numpy())\n",
"plt.axis(\"off\");"
]
},
{
"cell_type": "markdown",
"metadata": {
"colab_type": "text",
"id": "t93aVotMfBMB"
},
"source": [
"## 5. Rotate the object, modify the material properties or light properties\n",
"\n",
"We can also change many other settings in the rendering pipeline. Here we:\n",
"\n",
"- change the **viewing angle** of the camera\n",
"- change the **position** of the point light\n",
"- change the **material reflectance** properties of the mesh"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"colab": {},
"colab_type": "code",
"id": "4mYXYziefBMB"
},
"outputs": [],
"source": [
"# Rotate the object by increasing the elevation and azimuth angles\n",
"R, T = look_at_view_transform(dist=2.7, elev=10, azim=-150)\n",
"cameras = FoVPerspectiveCameras(device=device, R=R, T=T)\n",
"\n",
"# Move the light location so the light is shining on the cow's face. \n",
"lights.location = torch.tensor([[2.0, 2.0, -2.0]], device=device)\n",
"\n",
"# Change specular color to green and change material shininess \n",
"materials = Materials(\n",
" device=device,\n",
" specular_color=[[0.0, 1.0, 0.0]],\n",
" shininess=10.0\n",
")\n",
"\n",
"# Re render the mesh, passing in keyword arguments for the modified components.\n",
"images = renderer(mesh, lights=lights, materials=materials, cameras=cameras)"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"colab": {
"base_uri": "https://localhost:8080/",
"height": 592
},
"colab_type": "code",
"id": "rHIxIfh5fBME",
"outputId": "1ca2d337-2983-478f-b3c9-d64b84ba1a31"
},
"outputs": [],
"source": [
"plt.figure(figsize=(10, 10))\n",
"plt.imshow(images[0, ..., :3].cpu().numpy())\n",
"plt.axis(\"off\");"
]
},
{
"cell_type": "markdown",
"metadata": {
"colab_type": "text",
"id": "17c4xmtyfBMH"
},
"source": [
"## 6. Batched Rendering\n",
"\n",
"One of the core design choices of the PyTorch3D API is to support **batched inputs for all components**. \n",
"The renderer and associated components can take batched inputs and **render a batch of output images in one forward pass**. We will now use this feature to render the mesh from many different viewpoints.\n"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"colab": {},
"colab_type": "code",
"id": "CDQKebNNfBMI"
},
"outputs": [],
"source": [
"# Set batch size - this is the number of different viewpoints from which we want to render the mesh.\n",
"batch_size = 20\n",
"\n",
"# Create a batch of meshes by repeating the cow mesh and associated textures. \n",
"# Meshes has a useful `extend` method which allows us do this very easily. \n",
"# This also extends the textures. \n",
"meshes = mesh.extend(batch_size)\n",
"\n",
"# Get a batch of viewing angles. \n",
"elev = torch.linspace(0, 180, batch_size)\n",
"azim = torch.linspace(-180, 180, batch_size)\n",
"\n",
"# All the cameras helper methods support mixed type inputs and broadcasting. So we can \n",
"# view the camera from the same distance and specify dist=2.7 as a float,\n",
"# and then specify elevation and azimuth angles for each viewpoint as tensors. \n",
"R, T = look_at_view_transform(dist=2.7, elev=elev, azim=azim)\n",
"cameras = FoVPerspectiveCameras(device=device, R=R, T=T)\n",
"\n",
"# Move the light back in front of the cow which is facing the -z direction.\n",
"lights.location = torch.tensor([[0.0, 0.0, -3.0]], device=device)"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"colab": {},
"colab_type": "code",
"id": "gyYJCwEDfBML"
},
"outputs": [],
"source": [
"# We can pass arbitrary keyword arguments to the rasterizer/shader via the renderer\n",
"# so the renderer does not need to be reinitialized if any of the settings change.\n",
"images = renderer(meshes, cameras=cameras, lights=lights)"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"image_grid(images.cpu().numpy(), rows=4, cols=5, rgb=True)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## 7. Plotly visualization \n",
"If you only want to visualize a mesh, you don't really need to use a differentiable renderer - instead we support plotting of Meshes with plotly. For these Meshes, we use TexturesVertex to define a texture for the rendering.\n",
"`plot_meshes` creates a Plotly figure with a trace for each Meshes object. "
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"verts, faces_idx, _ = load_obj(obj_filename)\n",
"faces = faces_idx.verts_idx\n",
"\n",
"# Initialize each vertex to be white in color.\n",
"verts_rgb = torch.ones_like(verts)[None] # (1, V, 3)\n",
"textures = TexturesVertex(verts_features=verts_rgb.to(device))\n",
"\n",
"# Create a Meshes object\n",
"mesh = Meshes(\n",
" verts=[verts.to(device)], \n",
" faces=[faces.to(device)],\n",
" textures=textures\n",
")\n",
"\n",
"# Render the plotly figure\n",
"fig = plot_scene({\n",
" \"subplot1\": {\n",
" \"cow_mesh\": mesh\n",
" }\n",
"})\n",
"fig.show()"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"# use Plotly's default colors (no texture)\n",
"mesh = Meshes(\n",
" verts=[verts.to(device)], \n",
" faces=[faces.to(device)]\n",
")\n",
"\n",
"# Render the plotly figure\n",
"fig = plot_scene({\n",
" \"subplot1\": {\n",
" \"cow_mesh\": mesh\n",
" }\n",
"})\n",
"fig.show()"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"# create a batch of meshes, and offset one to prevent overlap\n",
"mesh_batch = Meshes(\n",
" verts=[verts.to(device), (verts + 2).to(device)], \n",
" faces=[faces.to(device), faces.to(device)]\n",
")\n",
"\n",
"# plot mesh batch in the same trace\n",
"fig = plot_scene({\n",
" \"subplot1\": {\n",
" \"cow_mesh_batch\": mesh_batch\n",
" }\n",
"})\n",
"fig.show()"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"# plot batch of meshes in different traces\n",
"fig = plot_scene({\n",
" \"subplot1\": {\n",
" \"cow_mesh1\": mesh_batch[0],\n",
" \"cow_mesh2\": mesh_batch[1]\n",
" }\n",
"})\n",
"fig.show()"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"# plot batch of meshes in different subplots\n",
"fig = plot_scene({\n",
" \"subplot1\": {\n",
" \"cow_mesh1\": mesh_batch[0]\n",
" },\n",
" \"subplot2\":{\n",
" \"cow_mesh2\": mesh_batch[1]\n",
" }\n",
"})\n",
"fig.show()"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"For batches, we can also use `plot_batch_individually` to avoid constructing the scene dictionary ourselves."
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"# extend the batch to have 4 meshes\n",
"mesh_4 = mesh_batch.extend(2)\n",
"\n",
"# visualize the batch in different subplots, 2 per row\n",
"fig = plot_batch_individually(mesh_4)\n",
"# we can update the figure height and width\n",
"fig.update_layout(height=1000, width=500)\n",
"fig.show()"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"We can also modify the axis arguments and axis backgrounds in both functions. "
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"fig2 = plot_scene({\n",
" \"cow_plot1\": {\n",
" \"cows\": mesh_batch\n",
" }\n",
"},\n",
" xaxis={\"backgroundcolor\":\"rgb(200, 200, 230)\"},\n",
" yaxis={\"backgroundcolor\":\"rgb(230, 200, 200)\"},\n",
" zaxis={\"backgroundcolor\":\"rgb(200, 230, 200)\"}, \n",
" axis_args=AxisArgs(showgrid=True))\n",
"fig2.show()"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
"fig3 = plot_batch_individually(\n",
" mesh_4, \n",
" ncols=2,\n",
" subplot_titles = [\"cow1\", \"cow2\", \"cow3\", \"cow4\"], # customize subplot titles\n",
" xaxis={\"backgroundcolor\":\"rgb(200, 200, 230)\"},\n",
" yaxis={\"backgroundcolor\":\"rgb(230, 200, 200)\"},\n",
" zaxis={\"backgroundcolor\":\"rgb(200, 230, 200)\"}, \n",
" axis_args=AxisArgs(showgrid=True))\n",
"fig3.show()"
]
},
{
"cell_type": "markdown",
"metadata": {
"colab_type": "text",
"id": "t3qphI1ElUb5"
},
"source": [
"## 8. Conclusion\n",
"In this tutorial we learnt how to **load** a textured mesh from an obj file, initialize a PyTorch3D datastructure called **Meshes**, set up an **Renderer** consisting of a **Rasterizer** and a **Shader**, and modify several components of the rendering pipeline. We also learned how to render Meshes in Plotly figures."
]
}
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