added tutorial 107 for screen capture and texturing
cleaned up the PNG functions
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Daniele Panozzo
+36
-16
@@ -45,6 +45,7 @@ lecture notes links to a cross-platform example application.</p>
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<li><a href="#scalarfieldvisualization">104 Scalar field visualization</a></li>
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<li><a href="#overlays">105 Overlays</a></li>
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<li><a href="#viewermenu">106 Viewer Menu</a></li>
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<li><a href="#screencapture">107 Screen Capture</a></li>
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</ul></li>
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<li><a href="#chapter2:discretegeometricquantitiesandoperators">Chapter 2: Discrete Geometric Quantities and
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Operators</a>
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@@ -479,13 +480,13 @@ viewer.callback_init = [&](igl::viewer::Viewer& viewer)
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// Expose a variable directly ...
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viewer.ngui->addVariable("float",floatVariable);
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// Expose an enumaration type
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viewer.ngui->addVariable<Orientation>("Direction",dir)->setItems({"Up","Down","Left","Right"});
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// Add a button
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viewer.ngui->addButton("Print Hello",[](){ std::cout << "Hello\n"; });
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// call to generate menu
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viewer.ngui->layout();
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return false;
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@@ -515,6 +516,25 @@ viewer.ngui->addVariable<bool>("bool",[&](bool val) {
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<figcaption>(<a href="106_ViewerMenu/main.cpp">Example 106</a>) The UI of the viewer can be easily customized.</figcaption>
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</figure>
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<h2 id="screencapture"><a href="#screencapture">Screen capture</a></h2>
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<p>It is possible to render the scene in a memory buffer using the function draw_buffer:</p>
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<pre><code class="cpp">// Allocate temporary buffers
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Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic> R(1280,800);
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Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic> G(1280,800);
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Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic> B(1280,800);
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Eigen::Matrix<unsigned char,Eigen::Dynamic,Eigen::Dynamic> A(1280,800);
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// Draw the scene in the buffers
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viewer.core.draw_buffer(viewer.data,viewer.opengl,false,R,G,B,A);
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// Save it to a PNG
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igl::png::writePNG(R,G,B,A,"out.png");
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</code></pre>
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<p>In <a href="107_ScreenCapture/main.cpp">Example 107</a> a scene is rendered in a temporary png and used to texture a quadrilateral.</p>
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<h1 id="chapter2:discretegeometricquantitiesandoperators">Chapter 2: Discrete Geometric Quantities and Operators</h1>
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<p>This chapter illustrates a few discrete quantities that libigl can compute on a
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@@ -1388,8 +1408,8 @@ of the discrete Laplace-Beltrami operator vary smoothly and slowly over the
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<p>Modern mesh-based shape deformation methods satisfy user deformation
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constraints at handles (selected vertices or regions on the mesh) and propagate
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these handle deformations to the rest of shape <em>smoothly</em> and <em>without removing
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or distorting details</em>. Libigl provides implementations of a variety of
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these handle deformations to the rest of shape <em>smoothly</em> and _without removing
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or distorting details_. Libigl provides implementations of a variety of
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state-of-the-art deformation techniques, ranging from quadratic mesh-based
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energy minimizers, to skinning methods, to non-linear elasticity-inspired
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techniques.</p>
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@@ -1477,11 +1497,11 @@ U = V+D;
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</code></pre>
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<figure>
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<img src="images/max-biharmonic.jpg" alt="The BiharmonicDeformation example deforms a statues head as a biharmonic
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surface (top) and using a biharmonic displacements
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<img src="images/max-biharmonic.jpg" alt="The BiharmonicDeformation example deforms a statues head as a _biharmonic
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surface_ (top) and using a biharmonic displacements
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(bottom)." />
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<figcaption>The <a href="401_BiharmonicDeformation/main.cpp">BiharmonicDeformation</a> example deforms a statue’s head as a <em>biharmonic
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surface</em> (top) and using a <em>biharmonic displacements</em>
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<figcaption>The <a href="401_BiharmonicDeformation/main.cpp">BiharmonicDeformation</a> example deforms a statue’s head as a _biharmonic
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surface_ (top) and using a <em>biharmonic displacements</em>
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(bottom).</figcaption>
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</figure>
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@@ -1939,8 +1959,8 @@ functions, thus <span class="math">\(\mathbf{A}\)</span> has affine functions in
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derivation proves that this implies <span class="math">\(\mathbf{W}\)</span> will be affine precise (see
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<a class="citation" href="#fn:20" title="Jump to citation">[20]<span class="citekey" style="display:none">wang_bc_2015</span></a>).</p>
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<p>Minimizers of this “squared Laplacian” energy are in some sense <em>discrete
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biharmonic functions</em>. Thus they’re dubbed “biharmonic coordinates” (not the
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<p>Minimizers of this “squared Laplacian” energy are in some sense _discrete
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biharmonic functions_. Thus they’re dubbed “biharmonic coordinates” (not the
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same as <em>bounded biharmonic weights</em>, which are <em>not</em> generalized barycentric
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coordinates).</p>
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@@ -3332,8 +3352,8 @@ empty</a>.
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That is, most points in space are outside of the solid object than inside.
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Points are sampled over surface patches. For each sample point, rays are shot
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into both hemispheres to compute average of the (distance weighted) ambient
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occlusion on each side. A patch is oriented so that the outward side is <em>less
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occluded</em> (lighter, i.e., facing more void space).</p>
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occlusion on each side. A patch is oriented so that the outward side is _less
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occluded_ (lighter, i.e., facing more void space).</p>
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<pre><code class="cpp">igl::embree::reorient_facets_raycast(V,F,FF,I);
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</code></pre>
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@@ -3396,8 +3416,8 @@ repository</a>.</p>
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</li>
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<li id="fn:3" class="citation"><span class="citekey" style="display:none">jacobson_thesis_2013</span><p>Alec Jacobson,
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<a href="https://www.google.com/search?q=Algorithms+and+Interfaces+for+Real-Time+Deformation+of+2D+and+3D+Shapes"><em>Algorithms and Interfaces for Real-Time Deformation of 2D and 3D
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Shapes</em></a>,
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<a href="https://www.google.com/search?q=Algorithms+and+Interfaces+for+Real-Time+Deformation+of+2D+and+3D+Shapes">_Algorithms and Interfaces for Real-Time Deformation of 2D and 3D
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Shapes_</a>,
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2013.</p>
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</li>
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@@ -3488,8 +3508,8 @@ repository</a>.</p>
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</li>
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<li id="fn:19" class="citation"><span class="citekey" style="display:none">jacobson_skinning_course_2014</span><p>Alec Jacobson, Zhigang Deng, Ladislav Kavan,
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J.P. Lewis. <a href="https://www.google.com/search?q=Skinning+Real-Time+Shape+Deformation"><em>Skinning: Real-Time Shape
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Deformation</em></a>,
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J.P. Lewis. <a href="https://www.google.com/search?q=Skinning+Real-Time+Shape+Deformation">_Skinning: Real-Time Shape
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Deformation_</a>,
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2014.</p>
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</li>
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