disabled depth clipping and set start selection to be near clip inste…

…ad of 1

src/extras/gizmo/axis-shapes.js

@@ -51,7 +51,7 @@ const SHADER = {
             // store z/w for later use in fragment shader
             vZW = gl_Position.zw;
             // disable depth clipping
-            gl_Position.z = 0.0;
+            // gl_Position.z = 0.0;
         }`,
     frag: /* glsl */`
         precision highp float;

src/extras/gizmo/gizmo.js

@@ -393,14 +393,14 @@ class Gizmo extends EventHandler {
     }
 
     _getSelection(x, y) {
-        const start = this._camera.screenToWorld(x, y, 1);
+        const start = this._camera.screenToWorld(x, y, this._camera.nearClip);
         const end = this._camera.screenToWorld(x, y, this._camera.farClip);
         const dir = end.clone().sub(start).normalize();
 
         const selection = [];
         for (let i = 0; i < this.intersectData.length; i++) {
             const { triData, parent, meshInstances } = this.intersectData[i];
-            const wtm = parent.getWorldTransform().clone();
+            const wtm = parent.getWorldTransform();
             for (let j = 0; j < triData.length; j++) {
                 const { tris, ptm, priority } = triData[j];
                 tmpM1.copy(wtm).mul(ptm);