Display Vertex Normals
Show Mesh Vertex Normals
This snippet allows you to add lines showing the normals for each vertex of a mesh. The colour and size of the lines can be set.
function showNormals(mesh, size, color, sc) {var normals = mesh.getVerticesData(BABYLON.VertexBuffer.NormalKind);var positions = mesh.getVerticesData(BABYLON.VertexBuffer.PositionKind);color = color || BABYLON.Color3.White();sc = sc || scene;size = size || 1;var lines = [];for (var i = 0; i < normals.length; i += 3) {var v1 = BABYLON.Vector3.FromArray(positions, i);var v2 = v1.add(BABYLON.Vector3.FromArray(normals, i).scaleInPlace(size));lines.push([v1.add(mesh.position), v2.add(mesh.position)]);}var normalLines = BABYLON.MeshBuilder.CreateLineSystem("normalLines", {lines: lines}, sc);normalLines.color = color;return normalLines;}