Draw a Sector of a Circle
Draw an Arc Between Two Vectors
Given an origin O and two vectors OA and OB this snippet draws an arc between the two vectors with a given radius. The arc can be drawn in three types 0 (default) a solid line, 1 a dashed line, 2 filled between arc and vectors.
function showAngleSector(origin, vector1, vector2, radius, sectorType) {radius = radius || 1;sectorType = sectorType || 0;var cross = BABYLON.Vector3.Cross(vector1, vector2);var dot = BABYLON.Vector3.Dot(vector1, vector2);var angle = Math.acos(dot / (vector1.length() * vector2.length()));var points = [];var minNb = 4;var factor = 2;var nbPoints = Math.floor(radius * angle * factor);nbPoints = (nbPoints < minNb) ? minNb : nbPoints;var firstPoint = ((BABYLON.Vector3.Normalize(vector1)).scale(radius));var lastPoint = ((BABYLON.Vector3.Normalize(vector2)).scale(radius));var matrix;var ang = angle / nbPoints;var rotated;for (var i = 0; i < nbPoints; i++) {matrix = BABYLON.Matrix.RotationAxis(cross, ang * i);rotated = BABYLON.Vector3.TransformCoordinates(firstPoint, matrix);points.push(rotated.add(origin));}points.push(lastPoint.add(origin));var sector;switch (sectorType) {case 0:sector = BABYLON.Mesh.CreateLines("sector", points, scene);break;case 1:sector = BABYLON.Mesh.CreateDashedLines("sector", points, 3, 1, nbPoints , scene);break;case 2:var pointO = [];for (var j = 0; j < points.length; j++) {pointO.push(origin);}sector = BABYLON.Mesh.CreateRibbon("sector", [points, pointO], null, null, 0, scene);break;default:sector = BABYLON.Mesh.CreateLines("sector", points, scene);break;}return sector;}