Renders [page:ArrowHelper arrows] to visualize an object's vertex normal vectors.
Requires that normals have been specified in a [page:BufferAttribute custom attribute] or
have been calculated using [page:Geometry.computeVertexNormals computeVertexNormals].
Unlike [page:FaceNormalsHelper], this works with [page:BufferGeometry].
var geometry = new v3d.BoxGeometry(10, 10, 10, 2, 2, 2);
var material = new v3d.MeshBasicMaterial({ color: 0xff0000 });
var box = new v3d.Mesh(geometry, material);
var helper = new v3d.VertexNormalsHelper(box, 2, 0x00ff00, 1);
scene.add(box);
scene.add(helper);
[page:Object3D object] -- object for which to render vertex normals.
[page:Number size] -- (optional) length of the arrows. Default is 1.
[page:Hex color] -- hex color of the arrows. Default is 0xff0000.
[page:Number linewidth] -- (optional) width of the arrow lines. Default is 1.
See the base [page:LineSegments] class for common properties.
See [page:Object3D.matrixAutoUpdate]. Set to *false* here as the helper is using the objects's [page:Object3D.matrixWorld matrixWorld].
The object for which the vertex normals are being visualized.
Length of the arrows. Default is *1*.
See the base [page:LineSegments] class for common methods.
Updates the vertex normal preview based on movement of the object.
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