raycast progress

examples/js/lines/LineSegments2.js

@@ -1,3 +1,5 @@
+import { Matrix4, Vector3, Vector2, PositionalAudio, Line } from "../../../build/three.module.js";
+
 /**
  * @author WestLangley / http://github.com/WestLangley
  *
@@ -52,6 +54,103 @@ THREE.LineSegments2.prototype = Object.assign( Object.create( THREE.Mesh.prototy
 
 		};
 
-	}() )
+	}() ),
+
+	raycast: ( function () {
+
+		var start = new Vector4();
+		var end = new Vector4();
+
+		var origin = new Vector4();
+		var mvMatrix = new Matrix4();
+		var line = new Line();
+		var closestPoint = new Vector3();
+
+		return function raycast( raycaster, insterescts ) {
+
+			if ( raycaster.camera === null ) {
+
+				console.error( 'THREE.LineSegments2: "Raycaster.camera" needs to be set in order to raycast against sprites.' );
+
+			}
+
+			var ray = raycaster.ray;
+			var camera = raycaster.camera;
+			var projectionMatrix = camera.projectionMatrix;
+
+			var geometry = this.geometry;
+			var material = this.material;
+			var resolution = material.resolution;
+			var lineWidth = material.lineWidth;
+
+			var instanceStart = geometry.attributes.instanceStart;
+			var instanceEnd = geometry.attributes.instanceEnd;
+
+			var isPerspective = projectionMatrix[ 2 ][ 3 ] === -1;
+			var aspect = resolution.x / resolution.y;
+
+			// ndc space [ - 0.5, 0.5 ]
+			origin.copy( ray.origin );
+			origin.w = 1;
+			origin.applyMatrix4( camera.matrixWorldInverse );
+			origin.applyMatrix4( projectionMatrix );
+			origin.multiplyScalar( 1 / origin.w );
+
+			// screen space
+			origin.x *= resolution.x;
+			origin.y *= resolution.y;
+			origin.z = 0;
+
+			mvMatrix.multiplyMatrices( camera.matrixWorldInverse, this.matrixWorld );
+
+			for ( var i = 0, l = instanceStart.count; i < l; i ++ ) {
+
+				// TODO: Maybe have to clip the line based on the camera?
+
+				start.fromBufferAttribute( instanceStart, i );
+				end.fromBufferAttribute( instanceEnd, i );
+
+				start.w = 1;
+				end.w = 1;
+
+				// camera space
+				start.applyMatrix4( mvMatrix );
+				end.applyMatrix4( mvMatrix );
+
+				// clip space
+				start.applyMatrix4( projectionMatrix );
+				end.applyMatrix4( projectionMatrix );
+
+				// ndc space [ - 0.5, 0.5 ]
+				start.multiplyScalar( 1 / start.w );
+				end.multiplyScalar( 1 / end.w );
+
+				// screen space
+				start.x *= resolution.x;
+				start.y *= resolution.y;
+
+				end.y *= resolution.y;
+				end.y *= resolution.y;
+
+				line.start.copy( start );
+				line.start.z = 0;
+
+				line.end.copy( end );
+				line.end.z = 0;
+
+				var param = line.closestPointToPointParameter( origin, true );
+				line.at( param, closestPoint );
+
+				if ( origin.distanceTo( closestPoint ) < lineWidth * 0.5 ) {
+
+					// intersected! output a hit
+
+				}
+
+			}
+
+		}
+
+	} () )
 
 } );