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<div class="highlight hl-ipython3"><pre><span></span><span class="c1"># Copyright (c) Facebook, Inc. and its affiliates. All rights reserved.</span>
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<h1 id="Camera-position-optimization-using-differentiable-rendering">Camera position optimization using differentiable rendering<a class="anchor-link" href="#Camera-position-optimization-using-differentiable-rendering"></a></h1><p>In this tutorial we will learn the [x, y, z] position of a camera given a reference image using differentiable rendering.</p>
<p>We will first initialize a renderer with a starting position for the camera. We will then use this to generate an image, compute a loss with the reference image, and finally backpropagate through the entire pipeline to update the position of the camera.</p>
<p>This tutorial shows how to:</p>
<ul>
<li>load a mesh from an <code>.obj</code> file</li>
<li>initialize a <code>Camera</code>, <code>Shader</code> and <code>Renderer</code>,</li>
<li>render a mesh</li>
<li>set up an optimization loop with a loss function and optimizer</li>
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<h2 id="Set-up-and-imports">Set up and imports<a class="anchor-link" href="#Set-up-and-imports"></a></h2>
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<div class="highlight hl-ipython3"><pre><span></span><span class="kn">import</span> <span class="nn">os</span>
<span class="kn">import</span> <span class="nn">torch</span>
<span class="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</span>
<span class="kn">from</span> <span class="nn">tqdm</span> <span class="kn">import</span> <span class="n">tqdm_notebook</span>
<span class="kn">import</span> <span class="nn">imageio</span>
<span class="kn">import</span> <span class="nn">torch.nn</span> <span class="k">as</span> <span class="nn">nn</span>
<span class="kn">import</span> <span class="nn">torch.nn.functional</span> <span class="k">as</span> <span class="nn">F</span>
<span class="kn">import</span> <span class="nn">matplotlib.pyplot</span> <span class="k">as</span> <span class="nn">plt</span>
<span class="kn">from</span> <span class="nn">skimage</span> <span class="kn">import</span> <span class="n">img_as_ubyte</span>
<span class="c1"># io utils</span>
<span class="kn">from</span> <span class="nn">pytorch3d.io</span> <span class="kn">import</span> <span class="n">load_obj</span>
<span class="c1"># datastructures</span>
<span class="kn">from</span> <span class="nn">pytorch3d.structures</span> <span class="kn">import</span> <span class="n">Meshes</span><span class="p">,</span> <span class="n">Textures</span>
<span class="c1"># 3D transformations functions</span>
<span class="kn">from</span> <span class="nn">pytorch3d.transforms</span> <span class="kn">import</span> <span class="n">Rotate</span><span class="p">,</span> <span class="n">Translate</span>
<span class="c1"># rendering components</span>
<span class="kn">from</span> <span class="nn">pytorch3d.renderer</span> <span class="kn">import</span> <span class="p">(</span>
<span class="n">OpenGLPerspectiveCameras</span><span class="p">,</span> <span class="n">look_at_view_transform</span><span class="p">,</span> <span class="n">look_at_rotation</span><span class="p">,</span>
<span class="n">RasterizationSettings</span><span class="p">,</span> <span class="n">MeshRenderer</span><span class="p">,</span> <span class="n">MeshRasterizer</span><span class="p">,</span> <span class="n">BlendParams</span><span class="p">,</span>
<span class="n">SilhouetteShader</span><span class="p">,</span> <span class="n">PhongShader</span><span class="p">,</span> <span class="n">PointLights</span>
<span class="p">)</span>
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<h3 id="Load-the-Obj">Load the Obj<a class="anchor-link" href="#Load-the-Obj"></a></h3><p>We will load an obj file and create a <strong>Meshes</strong> object. <strong>Meshes</strong> is a unique datastructure provided in PyTorch3d for working with <strong>batches of meshes of different sizes</strong>. It has several useful class methods which are used in the rendering pipeline.</p>
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<div class="highlight hl-ipython3"><pre><span></span><span class="c1"># Set the cuda device </span>
<span class="n">device</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">device</span><span class="p">(</span><span class="s2">"cuda:0"</span><span class="p">)</span>
<span class="n">torch</span><span class="o">.</span><span class="n">cuda</span><span class="o">.</span><span class="n">set_device</span><span class="p">(</span><span class="n">device</span><span class="p">)</span>
<span class="c1"># Load the obj and ignore the textures and materials.</span>
<span class="n">verts</span><span class="p">,</span> <span class="n">faces_idx</span><span class="p">,</span> <span class="n">_</span> <span class="o">=</span> <span class="n">load_obj</span><span class="p">(</span><span class="s2">"./data/teapot.obj"</span><span class="p">)</span>
<span class="n">faces</span> <span class="o">=</span> <span class="n">faces_idx</span><span class="o">.</span><span class="n">verts_idx</span>
<span class="c1"># Initialize each vertex to be white in color.</span>
<span class="n">verts_rgb</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">ones_like</span><span class="p">(</span><span class="n">verts</span><span class="p">)[</span><span class="kc">None</span><span class="p">]</span> <span class="c1"># (1, V, 3)</span>
<span class="n">textures</span> <span class="o">=</span> <span class="n">Textures</span><span class="p">(</span><span class="n">verts_rgb</span><span class="o">=</span><span class="n">verts_rgb</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="n">device</span><span class="p">))</span>
<span class="c1"># Create a Meshes object for the teapot. Here we have only one mesh in the batch.</span>
<span class="n">teapot_mesh</span> <span class="o">=</span> <span class="n">Meshes</span><span class="p">(</span>
<span class="n">verts</span><span class="o">=</span><span class="p">[</span><span class="n">verts</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="n">device</span><span class="p">)],</span>
<span class="n">faces</span><span class="o">=</span><span class="p">[</span><span class="n">faces</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="n">device</span><span class="p">)],</span>
<span class="n">textures</span><span class="o">=</span><span class="n">textures</span>
<span class="p">)</span>
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<h2 id="Optimization-setup">Optimization setup<a class="anchor-link" href="#Optimization-setup"></a></h2>
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<h3 id="Create-a-renderer">Create a renderer<a class="anchor-link" href="#Create-a-renderer"></a></h3><p>A <strong>renderer</strong> in PyTorch3d is composed of a <strong>rasterizer</strong> and a <strong>shader</strong> which each have a number of subcomponents such as a <strong>camera</strong> (orthgraphic/perspective). Here we initialize some of these components and use default values for the rest.</p>
<p>For optimizing the camera position we will use a renderer which produces a <strong>silhouette</strong> of the object only and does not apply any <strong>lighting</strong> or <strong>shading</strong>. We will also initialize another renderer which applies full <strong>phong shading</strong> and use this for visualizing the outputs.</p>
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<div class="highlight hl-ipython3"><pre><span></span><span class="c1"># Initialize an OpenGL perspective camera.</span>
<span class="n">cameras</span> <span class="o">=</span> <span class="n">OpenGLPerspectiveCameras</span><span class="p">(</span><span class="n">device</span><span class="o">=</span><span class="n">device</span><span class="p">)</span>
<span class="c1"># To blend the 100 faces we set a few parameters which control the opacity and the sharpness of </span>
<span class="c1"># edges. Refer to blending.py for more details. </span>
<span class="n">blend_params</span> <span class="o">=</span> <span class="n">BlendParams</span><span class="p">(</span><span class="n">sigma</span><span class="o">=</span><span class="mf">1e-4</span><span class="p">,</span> <span class="n">gamma</span><span class="o">=</span><span class="mf">1e-4</span><span class="p">)</span>
<span class="c1"># Define the settings for rasterization and shading. Here we set the output image to be of size</span>
<span class="c1"># 256x256. To form the blended image we use 100 faces for each pixel. Refer to rasterize_meshes.py</span>
<span class="c1"># for an explanation of this parameter. </span>
<span class="n">raster_settings</span> <span class="o">=</span> <span class="n">RasterizationSettings</span><span class="p">(</span>
<span class="n">image_size</span><span class="o">=</span><span class="mi">256</span><span class="p">,</span>
<span class="n">blur_radius</span><span class="o">=</span><span class="n">np</span><span class="o">.</span><span class="n">log</span><span class="p">(</span><span class="mf">1.</span> <span class="o">/</span> <span class="mf">1e-4</span> <span class="o">-</span> <span class="mf">1.</span><span class="p">)</span> <span class="o">*</span> <span class="n">blend_params</span><span class="o">.</span><span class="n">sigma</span><span class="p">,</span>
<span class="n">faces_per_pixel</span><span class="o">=</span><span class="mi">100</span><span class="p">,</span>
<span class="n">bin_size</span><span class="o">=</span><span class="mi">0</span>
<span class="p">)</span>
<span class="c1"># Create a silhouette mesh renderer by composing a rasterizer and a shader. </span>
<span class="n">silhouette_renderer</span> <span class="o">=</span> <span class="n">MeshRenderer</span><span class="p">(</span>
<span class="n">rasterizer</span><span class="o">=</span><span class="n">MeshRasterizer</span><span class="p">(</span>
<span class="n">cameras</span><span class="o">=</span><span class="n">cameras</span><span class="p">,</span>
<span class="n">raster_settings</span><span class="o">=</span><span class="n">raster_settings</span>
<span class="p">),</span>
<span class="n">shader</span><span class="o">=</span><span class="n">SilhouetteShader</span><span class="p">(</span><span class="n">blend_params</span><span class="o">=</span><span class="n">blend_params</span><span class="p">)</span>
<span class="p">)</span>
<span class="c1"># We will also create a phong renderer. This is simpler and only needs to render one face per pixel.</span>
<span class="n">raster_settings</span> <span class="o">=</span> <span class="n">RasterizationSettings</span><span class="p">(</span>
<span class="n">image_size</span><span class="o">=</span><span class="mi">256</span><span class="p">,</span>
<span class="n">blur_radius</span><span class="o">=</span><span class="mf">0.0</span><span class="p">,</span>
<span class="n">faces_per_pixel</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span>
<span class="n">bin_size</span><span class="o">=</span><span class="mi">0</span>
<span class="p">)</span>
<span class="c1"># We can add a point light in front of the object. </span>
<span class="n">lights</span> <span class="o">=</span> <span class="n">PointLights</span><span class="p">(</span><span class="n">device</span><span class="o">=</span><span class="n">device</span><span class="p">,</span> <span class="n">location</span><span class="o">=</span><span class="p">((</span><span class="mf">2.0</span><span class="p">,</span> <span class="mf">2.0</span><span class="p">,</span> <span class="o">-</span><span class="mf">2.0</span><span class="p">),))</span>
<span class="n">phong_renderer</span> <span class="o">=</span> <span class="n">MeshRenderer</span><span class="p">(</span>
<span class="n">rasterizer</span><span class="o">=</span><span class="n">MeshRasterizer</span><span class="p">(</span>
<span class="n">cameras</span><span class="o">=</span><span class="n">cameras</span><span class="p">,</span>
<span class="n">raster_settings</span><span class="o">=</span><span class="n">raster_settings</span>
<span class="p">),</span>
<span class="n">shader</span><span class="o">=</span><span class="n">PhongShader</span><span class="p">(</span><span class="n">device</span><span class="o">=</span><span class="n">device</span><span class="p">,</span> <span class="n">lights</span><span class="o">=</span><span class="n">lights</span><span class="p">)</span>
<span class="p">)</span>
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<h3 id="Create-a-reference-image">Create a reference image<a class="anchor-link" href="#Create-a-reference-image"></a></h3><p>We will first position the teapot and generate an image. We use helper functions to rotate the teapot to a desired viewpoint. Then we can use the renderers to produce an image. Here we will use both renderers and visualize the silhouette and full shaded image.</p>
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<div class="highlight hl-ipython3"><pre><span></span><span class="c1"># Select the viewpoint using spherical angles </span>
<span class="n">distance</span> <span class="o">=</span> <span class="mi">3</span> <span class="c1"># distance from camera to the object</span>
<span class="n">elevation</span> <span class="o">=</span> <span class="mf">40.0</span> <span class="c1"># angle of elevation in degrees</span>
<span class="n">azimuth</span> <span class="o">=</span> <span class="mf">10.0</span> <span class="c1"># angle of azimuth rotation in degrees</span>
<span class="c1"># Get the position of the camera based on the spherical angles</span>
<span class="n">R</span><span class="p">,</span> <span class="n">T</span> <span class="o">=</span> <span class="n">look_at_view_transform</span><span class="p">(</span><span class="n">distance</span><span class="p">,</span> <span class="n">elevation</span><span class="p">,</span> <span class="n">azimuth</span><span class="p">,</span> <span class="n">device</span><span class="o">=</span><span class="n">device</span><span class="p">)</span>
<span class="c1"># Render the teapot providing the values of R and T. </span>
<span class="n">silhouete</span> <span class="o">=</span> <span class="n">silhouette_renderer</span><span class="p">(</span><span class="n">meshes_world</span><span class="o">=</span><span class="n">teapot_mesh</span><span class="p">,</span> <span class="n">R</span><span class="o">=</span><span class="n">R</span><span class="p">,</span> <span class="n">T</span><span class="o">=</span><span class="n">T</span><span class="p">)</span>
<span class="n">image_ref</span> <span class="o">=</span> <span class="n">phong_renderer</span><span class="p">(</span><span class="n">meshes_world</span><span class="o">=</span><span class="n">teapot_mesh</span><span class="p">,</span> <span class="n">R</span><span class="o">=</span><span class="n">R</span><span class="p">,</span> <span class="n">T</span><span class="o">=</span><span class="n">T</span><span class="p">)</span>
<span class="n">silhouete</span> <span class="o">=</span> <span class="n">silhouete</span><span class="o">.</span><span class="n">cpu</span><span class="p">()</span><span class="o">.</span><span class="n">numpy</span><span class="p">()</span>
<span class="n">image_ref</span> <span class="o">=</span> <span class="n">image_ref</span><span class="o">.</span><span class="n">cpu</span><span class="p">()</span><span class="o">.</span><span class="n">numpy</span><span class="p">()</span>
<span class="n">plt</span><span class="o">.</span><span class="n">figure</span><span class="p">(</span><span class="n">figsize</span><span class="o">=</span><span class="p">(</span><span class="mi">10</span><span class="p">,</span> <span class="mi">10</span><span class="p">))</span>
<span class="n">plt</span><span class="o">.</span><span class="n">subplot</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">imshow</span><span class="p">(</span><span class="n">silhouete</span><span class="o">.</span><span class="n">squeeze</span><span class="p">()[</span><span class="o">...</span><span class="p">,</span> <span class="mi">3</span><span class="p">])</span> <span class="c1"># only plot the alpha channel of the RGBA image</span>
<span class="n">plt</span><span class="o">.</span><span class="n">grid</span><span class="p">(</span><span class="s2">"off"</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">subplot</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">imshow</span><span class="p">(</span><span class="n">image_ref</span><span class="o">.</span><span class="n">squeeze</span><span class="p">())</span>
<span class="n">plt</span><span class="o">.</span><span class="n">grid</span><span class="p">(</span><span class="s2">"off"</span><span class="p">)</span>
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<h3 id="Set-up-a-basic-model">Set up a basic model<a class="anchor-link" href="#Set-up-a-basic-model"></a></h3><p>Here we create a simple model class and initialize a parameter for the camera position.</p>
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<div class="prompt input_prompt">In [10]:</div>
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<div class="highlight hl-ipython3"><pre><span></span><span class="k">class</span> <span class="nc">Model</span><span class="p">(</span><span class="n">nn</span><span class="o">.</span><span class="n">Module</span><span class="p">):</span>
<span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">meshes</span><span class="p">,</span> <span class="n">renderer</span><span class="p">,</span> <span class="n">image_ref</span><span class="p">):</span>
<span class="nb">super</span><span class="p">()</span><span class="o">.</span><span class="fm">__init__</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">meshes</span> <span class="o">=</span> <span class="n">meshes</span>
<span class="bp">self</span><span class="o">.</span><span class="n">device</span> <span class="o">=</span> <span class="n">meshes</span><span class="o">.</span><span class="n">device</span>
<span class="bp">self</span><span class="o">.</span><span class="n">renderer</span> <span class="o">=</span> <span class="n">renderer</span>
<span class="c1"># Get the silhouette of the reference RGB image by finding all the non zero values. </span>
<span class="n">image_ref</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">from_numpy</span><span class="p">((</span><span class="n">image_ref</span><span class="p">[</span><span class="o">...</span><span class="p">,</span> <span class="p">:</span><span class="mi">3</span><span class="p">]</span><span class="o">.</span><span class="n">max</span><span class="p">(</span><span class="o">-</span><span class="mi">1</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">)</span><span class="o">.</span><span class="n">astype</span><span class="p">(</span><span class="n">np</span><span class="o">.</span><span class="n">float32</span><span class="p">))</span>
<span class="bp">self</span><span class="o">.</span><span class="n">register_buffer</span><span class="p">(</span><span class="s1">'image_ref'</span><span class="p">,</span> <span class="n">image_ref</span><span class="p">)</span>
<span class="c1"># Create an optimizable parameter for the x, y, z position of the camera. </span>
<span class="bp">self</span><span class="o">.</span><span class="n">camera_position</span> <span class="o">=</span> <span class="n">nn</span><span class="o">.</span><span class="n">Parameter</span><span class="p">(</span>
<span class="n">torch</span><span class="o">.</span><span class="n">from_numpy</span><span class="p">(</span><span class="n">np</span><span class="o">.</span><span class="n">array</span><span class="p">([</span><span class="mf">3.0</span><span class="p">,</span> <span class="mf">6.9</span><span class="p">,</span> <span class="o">-</span><span class="mf">2.5</span><span class="p">],</span> <span class="n">dtype</span><span class="o">=</span><span class="n">np</span><span class="o">.</span><span class="n">float32</span><span class="p">))</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="n">meshes</span><span class="o">.</span><span class="n">device</span><span class="p">))</span>
<span class="k">def</span> <span class="nf">forward</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># Render the image using the updated camera position. Based on the new position of the </span>
<span class="c1"># camer we calculate the rotation and translation matrices</span>
<span class="n">R</span> <span class="o">=</span> <span class="n">look_at_rotation</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">camera_position</span><span class="p">[</span><span class="kc">None</span><span class="p">,</span> <span class="p">:],</span> <span class="n">device</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">device</span><span class="p">)</span> <span class="c1"># (1, 3, 3)</span>
<span class="n">T</span> <span class="o">=</span> <span class="o">-</span><span class="n">torch</span><span class="o">.</span><span class="n">bmm</span><span class="p">(</span><span class="n">R</span><span class="o">.</span><span class="n">transpose</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">),</span> <span class="bp">self</span><span class="o">.</span><span class="n">camera_position</span><span class="p">[</span><span class="kc">None</span><span class="p">,</span> <span class="p">:,</span> <span class="kc">None</span><span class="p">])[:,</span> <span class="p">:,</span> <span class="mi">0</span><span class="p">]</span> <span class="c1"># (1, 3)</span>
<span class="n">image</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">renderer</span><span class="p">(</span><span class="n">meshes_world</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">meshes</span><span class="o">.</span><span class="n">clone</span><span class="p">(),</span> <span class="n">R</span><span class="o">=</span><span class="n">R</span><span class="p">,</span> <span class="n">T</span><span class="o">=</span><span class="n">T</span><span class="p">)</span>
<span class="c1"># Calculate the silhouette loss</span>
<span class="n">loss</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">sum</span><span class="p">((</span><span class="n">image</span><span class="p">[</span><span class="o">...</span><span class="p">,</span> <span class="mi">3</span><span class="p">]</span> <span class="o">-</span> <span class="bp">self</span><span class="o">.</span><span class="n">image_ref</span><span class="p">)</span> <span class="o">**</span> <span class="mi">2</span><span class="p">)</span>
<span class="k">return</span> <span class="n">loss</span><span class="p">,</span> <span class="n">image</span>
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<h2 id="Initialize-the-model-and-optimizer">Initialize the model and optimizer<a class="anchor-link" href="#Initialize-the-model-and-optimizer"></a></h2><p>Now we can create an instance of the <strong>model</strong> above and set up an <strong>optimizer</strong> for the camera position parameter.</p>
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<div class="highlight hl-ipython3"><pre><span></span><span class="c1"># We will save images periodically and compose them into a GIF.</span>
<span class="n">filename_output</span> <span class="o">=</span> <span class="s2">"./teapot_optimization_demo.gif"</span>
<span class="n">writer</span> <span class="o">=</span> <span class="n">imageio</span><span class="o">.</span><span class="n">get_writer</span><span class="p">(</span><span class="n">filename_output</span><span class="p">,</span> <span class="n">mode</span><span class="o">=</span><span class="s1">'I'</span><span class="p">,</span> <span class="n">duration</span><span class="o">=</span><span class="mf">0.3</span><span class="p">)</span>
<span class="c1"># Initialize a model using the renderer, mesh and reference image</span>
<span class="n">model</span> <span class="o">=</span> <span class="n">Model</span><span class="p">(</span><span class="n">meshes</span><span class="o">=</span><span class="n">teapot_mesh</span><span class="p">,</span> <span class="n">renderer</span><span class="o">=</span><span class="n">silhouette_renderer</span><span class="p">,</span> <span class="n">image_ref</span><span class="o">=</span><span class="n">image_ref</span><span class="p">)</span><span class="o">.</span><span class="n">to</span><span class="p">(</span><span class="n">device</span><span class="p">)</span>
<span class="c1"># Create an optimizer. Here we are using Adam and we pass in the parameters of the model</span>
<span class="n">optimizer</span> <span class="o">=</span> <span class="n">torch</span><span class="o">.</span><span class="n">optim</span><span class="o">.</span><span class="n">Adam</span><span class="p">(</span><span class="n">model</span><span class="o">.</span><span class="n">parameters</span><span class="p">(),</span> <span class="n">lr</span><span class="o">=</span><span class="mf">0.05</span><span class="p">)</span>
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<h2 id="Visualise-the-starting-position-and-the-reference-position">Visualise the starting position and the reference position<a class="anchor-link" href="#Visualise-the-starting-position-and-the-reference-position"></a></h2>
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<div class="highlight hl-ipython3"><pre><span></span><span class="n">plt</span><span class="o">.</span><span class="n">figure</span><span class="p">(</span><span class="n">figsize</span><span class="o">=</span><span class="p">(</span><span class="mi">10</span><span class="p">,</span> <span class="mi">10</span><span class="p">))</span>
<span class="n">_</span><span class="p">,</span> <span class="n">image_init</span> <span class="o">=</span> <span class="n">model</span><span class="p">()</span>
<span class="n">plt</span><span class="o">.</span><span class="n">subplot</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">imshow</span><span class="p">(</span><span class="n">image_init</span><span class="o">.</span><span class="n">detach</span><span class="p">()</span><span class="o">.</span><span class="n">squeeze</span><span class="p">()</span><span class="o">.</span><span class="n">cpu</span><span class="p">()</span><span class="o">.</span><span class="n">numpy</span><span class="p">()[</span><span class="o">...</span><span class="p">,</span> <span class="mi">3</span><span class="p">])</span>
<span class="n">plt</span><span class="o">.</span><span class="n">grid</span><span class="p">(</span><span class="s2">"off"</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">title</span><span class="p">(</span><span class="s2">"Starting position"</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">subplot</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">2</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">imshow</span><span class="p">(</span><span class="n">model</span><span class="o">.</span><span class="n">image_ref</span><span class="o">.</span><span class="n">cpu</span><span class="p">()</span><span class="o">.</span><span class="n">numpy</span><span class="p">()</span><span class="o">.</span><span class="n">squeeze</span><span class="p">())</span>
<span class="n">plt</span><span class="o">.</span><span class="n">grid</span><span class="p">(</span><span class="s2">"off"</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">title</span><span class="p">(</span><span class="s2">"Reference silhouette"</span><span class="p">)</span>
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<pre>Text(0.5,1,'Reference silhouette')</pre>
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<h2 id="Run-the-optimization">Run the optimization<a class="anchor-link" href="#Run-the-optimization"></a></h2><p>We run several iterations of the forward and backward pass and save outputs every 10 iterations. When this has finished take a look at <code>./teapot_optimization_demo.gif</code> for a cool gif of the optimization process!</p>
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<div class="prompt input_prompt">In [13]:</div>
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<div class="highlight hl-ipython3"><pre><span></span><span class="n">loop</span> <span class="o">=</span> <span class="n">tqdm_notebook</span><span class="p">(</span><span class="nb">range</span><span class="p">(</span><span class="mi">200</span><span class="p">))</span>
<span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="n">loop</span><span class="p">:</span>
<span class="n">optimizer</span><span class="o">.</span><span class="n">zero_grad</span><span class="p">()</span>
<span class="n">loss</span><span class="p">,</span> <span class="n">_</span> <span class="o">=</span> <span class="n">model</span><span class="p">()</span>
<span class="n">loss</span><span class="o">.</span><span class="n">backward</span><span class="p">()</span>
<span class="n">optimizer</span><span class="o">.</span><span class="n">step</span><span class="p">()</span>
<span class="n">loop</span><span class="o">.</span><span class="n">set_description</span><span class="p">(</span><span class="s1">'Optimizing (loss </span><span class="si">%.4f</span><span class="s1">)'</span> <span class="o">%</span> <span class="n">loss</span><span class="o">.</span><span class="n">data</span><span class="p">)</span>
<span class="k">if</span> <span class="n">loss</span><span class="o">.</span><span class="n">item</span><span class="p">()</span> <span class="o">&lt;</span> <span class="mi">200</span><span class="p">:</span>
<span class="k">break</span>
<span class="c1"># Save outputs to create a GIF. </span>
<span class="k">if</span> <span class="n">i</span> <span class="o">%</span> <span class="mi">10</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span>
<span class="n">R</span> <span class="o">=</span> <span class="n">look_at_rotation</span><span class="p">(</span><span class="n">model</span><span class="o">.</span><span class="n">camera_position</span><span class="p">[</span><span class="kc">None</span><span class="p">,</span> <span class="p">:],</span> <span class="n">device</span><span class="o">=</span><span class="n">model</span><span class="o">.</span><span class="n">device</span><span class="p">)</span>
<span class="n">T</span> <span class="o">=</span> <span class="o">-</span><span class="n">torch</span><span class="o">.</span><span class="n">bmm</span><span class="p">(</span><span class="n">R</span><span class="o">.</span><span class="n">transpose</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">),</span> <span class="n">model</span><span class="o">.</span><span class="n">camera_position</span><span class="p">[</span><span class="kc">None</span><span class="p">,</span> <span class="p">:,</span> <span class="kc">None</span><span class="p">])[:,</span> <span class="p">:,</span> <span class="mi">0</span><span class="p">]</span> <span class="c1"># (1, 3)</span>
<span class="n">image</span> <span class="o">=</span> <span class="n">phong_renderer</span><span class="p">(</span><span class="n">meshes_world</span><span class="o">=</span><span class="n">model</span><span class="o">.</span><span class="n">meshes</span><span class="o">.</span><span class="n">clone</span><span class="p">(),</span> <span class="n">R</span><span class="o">=</span><span class="n">R</span><span class="p">,</span> <span class="n">T</span><span class="o">=</span><span class="n">T</span><span class="p">)</span>
<span class="n">image</span> <span class="o">=</span> <span class="n">image</span><span class="p">[</span><span class="mi">0</span><span class="p">,</span> <span class="o">...</span><span class="p">,</span> <span class="p">:</span><span class="mi">3</span><span class="p">]</span><span class="o">.</span><span class="n">detach</span><span class="p">()</span><span class="o">.</span><span class="n">squeeze</span><span class="p">()</span><span class="o">.</span><span class="n">cpu</span><span class="p">()</span><span class="o">.</span><span class="n">numpy</span><span class="p">()</span>
<span class="n">image</span> <span class="o">=</span> <span class="n">img_as_ubyte</span><span class="p">(</span><span class="n">image</span><span class="p">)</span>
<span class="n">writer</span><span class="o">.</span><span class="n">append_data</span><span class="p">(</span><span class="n">image</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">figure</span><span class="p">()</span>
<span class="n">plt</span><span class="o">.</span><span class="n">imshow</span><span class="p">(</span><span class="n">image</span><span class="p">[</span><span class="o">...</span><span class="p">,</span> <span class="p">:</span><span class="mi">3</span><span class="p">])</span>
<span class="n">plt</span><span class="o">.</span><span class="n">title</span><span class="p">(</span><span class="s2">"iter: </span><span class="si">%d</span><span class="s2">, loss: </span><span class="si">%0.2f</span><span class="s2">"</span> <span class="o">%</span> <span class="p">(</span><span class="n">i</span><span class="p">,</span> <span class="n">loss</span><span class="o">.</span><span class="n">data</span><span class="p">))</span>
<span class="n">plt</span><span class="o">.</span><span class="n">grid</span><span class="p">(</span><span class="s2">"off"</span><span class="p">)</span>
<span class="n">plt</span><span class="o">.</span><span class="n">axis</span><span class="p">(</span><span class="s2">"off"</span><span class="p">)</span>
<span class="n">writer</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
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