Initial project import

node_modules/three-stdlib/helpers/VertexTangentsHelper.js

@@ -0,0 +1,44 @@
+import { LineSegments, BufferGeometry, Float32BufferAttribute, LineBasicMaterial, Vector3 } from "three";
+const _v1 = /* @__PURE__ */ new Vector3();
+const _v2 = /* @__PURE__ */ new Vector3();
+class VertexTangentsHelper extends LineSegments {
+  constructor(object, size = 1, color = 65535) {
+    const geometry = new BufferGeometry();
+    const nTangents = object.geometry.attributes.tangent.count;
+    const positions = new Float32BufferAttribute(nTangents * 2 * 3, 3);
+    geometry.setAttribute("position", positions);
+    super(geometry, new LineBasicMaterial({ color, toneMapped: false }));
+    this.object = object;
+    this.size = size;
+    this.type = "VertexTangentsHelper";
+    this.matrixAutoUpdate = false;
+    this.update();
+  }
+  update() {
+    this.object.updateMatrixWorld(true);
+    const matrixWorld = this.object.matrixWorld;
+    const position = this.geometry.attributes.position;
+    const objGeometry = this.object.geometry;
+    const objPos = objGeometry.attributes.position;
+    const objTan = objGeometry.attributes.tangent;
+    let idx = 0;
+    for (let j = 0, jl = objPos.count; j < jl; j++) {
+      _v1.fromBufferAttribute(objPos, j).applyMatrix4(matrixWorld);
+      _v2.fromBufferAttribute(objTan, j);
+      _v2.transformDirection(matrixWorld).multiplyScalar(this.size).add(_v1);
+      position.setXYZ(idx, _v1.x, _v1.y, _v1.z);
+      idx = idx + 1;
+      position.setXYZ(idx, _v2.x, _v2.y, _v2.z);
+      idx = idx + 1;
+    }
+    position.needsUpdate = true;
+  }
+  dispose() {
+    this.geometry.dispose();
+    this.material.dispose();
+  }
+}
+export {
+  VertexTangentsHelper
+};
+//# sourceMappingURL=VertexTangentsHelper.js.map