title, descript

Author: Twinklebear

index.html

@@ -14,6 +14,7 @@
 	<div class="container mt-4">
 		<div class="row">
 			<div class="col-12 text-center">
+                <h3>WebGL + WebASM Marching Cubes</h3>
 				<canvas id="glcanvas" class="img-fluid" width="640" height="480"></canvas>
 			</div>
 			<div class="mx-auto col-12 col-lg-8 row">
@@ -38,18 +39,32 @@
                 <p id="isosurfaceInfo">Isosurface info:</p>
 				</div>
 				<div class="col-12 mt-lg-2 mt-0">
-					<p>Mouse Controls: Left-click + drag to rotate, scroll to zoom, right-click + drag to pan.
+					<h4>Controls</h4>
+					<p>Desktop: Left-click + drag to rotate, scroll to zoom,
+					right-click + drag to pan.
 					<br/>
-					Touch Controls: One finger drag to rotate, pinch to zoom, two finger drag to pan.
-					</p>
-					
+					Touch: One finger drag to rotate, pinch to zoom, two finger drag to pan.
+                    </p>
 					<p id="loadingText"></p>
 					<div class="progress mb-2">
 						<div id="loadingProgressBar" class="progress-bar" role="progressbar"
 							aria-valuenow="0" aria-valuemin="0" aria-valuemax="100"></div>
 					</div>
+
+                    <h4>Description</h4>
+                    <p>
+                    This is a WebGL + WebASM implementation of the classic <a href="https://en.wikipedia.org/wiki/Marching_cubes">Marching Cubes</a>
+                    algorithm for extracting <a href="https://en.wikipedia.org/wiki/Isosurface">isosurfaces</a> from 3D volume data.
+                    An isosurface is a surface
+                    which represents points in the 3D data which all have the same value (e.g., pressure, temperature).
+                    Try changing the slider to change the selected isovalue! The actual isosurface extraction code
+                    is implemented in Rust and compiled to WebAssembly to accelerate extraction of the surface. Compared to
+                    the pure Javascript version, the WebASM version is 10-20x faster! You can run the Javascript version
+                    by unchecking the "Use WebASM" box. The surface is rendered as a triangle mesh and combined with the
+                    volume during the volume raycasting step, in a manner roughly similar to shadow mapping.
 					<a href="https://github.com/Twinklebear/webgl-marching-cubes">
 						Get the code on GitHub!</a>
+                    </p>
 				</div>
 			</div>
 		</div>