From bfbd8c92ba5ca5e46daec5e030151847b586cbac Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E2=80=94?= <drcmda@gmail.com>
Date: Thu, 2 Dec 2021 14:21:08 +0100
Subject: [PATCH] fix: cursorzoom+ortho maxdist

---
 src/controls/TrackballControls.ts | 24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/src/controls/TrackballControls.ts b/src/controls/TrackballControls.ts
index 0c2adf7..ce5a8e1 100644
--- a/src/controls/TrackballControls.ts
+++ b/src/controls/TrackballControls.ts
@@ -179,12 +179,17 @@ class TrackballControls extends EventDispatcher {
     } else {
       factor = 1.0 + (this._zoomEnd.y - this._zoomStart.y) * this.zoomSpeed
 
-      if (factor !== 1.0 && factor > 0.0) {
+      if (Math.abs(factor - 1.0) > this.EPS && factor > 0.0) {
         if ((this.object as PerspectiveCamera).isPerspectiveCamera) {
+          if (factor > 1.0 && this._eye.length() >= this.maxDistance - this.EPS) {
+            factor = 1.0
+          }
           this._eye.multiplyScalar(factor)
         } else if ((this.object as OrthographicCamera).isOrthographicCamera) {
+          if (factor > 1.0 && this.object.zoom < this.maxDistance * this.maxDistance) {
+            factor = 1.0
+          }
           this.object.zoom /= factor
-          this.object.updateProjectionMatrix()
         } else {
           console.warn('THREE.TrackballControls: Unsupported camera type')
         }
@@ -206,6 +211,11 @@ class TrackballControls extends EventDispatcher {
         //adjust target point so that "point" stays in place
         this.target.lerpVectors(worldPos, this.target, factor)
       }
+
+      // Update the projection matrix after all properties are changed
+      if ((this.object as OrthographicCamera).isOrthographicCamera) {
+        this.object.updateProjectionMatrix()
+      }
     }
   }
 
@@ -217,18 +227,18 @@ class TrackballControls extends EventDispatcher {
     if (!this.domElement) return
     this.mouseChange.copy(this._panEnd).sub(this._panStart)
 
-    if (this.mouseChange.lengthSq()) {
+    if (this.mouseChange.lengthSq() > this.EPS) {
       if ((this.object as OrthographicCamera).isOrthographicCamera) {
         const orthoObject = this.object as OrthographicCamera
-        const scale_x = (orthoObject.right - orthoObject.left) / this.object.zoom / this.domElement.clientWidth
-        const scale_y = (orthoObject.top - orthoObject.bottom) / this.object.zoom / this.domElement.clientWidth
+        const scale_x = (orthoObject.right - orthoObject.left) / this.object.zoom
+        const scale_y = (orthoObject.top - orthoObject.bottom) / this.object.zoom
 
         this.mouseChange.x *= scale_x
         this.mouseChange.y *= scale_y
+      } else {
+        this.mouseChange.multiplyScalar(this._eye.length() * this.panSpeed)
       }
 
-      this.mouseChange.multiplyScalar(this._eye.length() * this.panSpeed)
-
       this.pan.copy(this._eye).cross(this.object.up).setLength(this.mouseChange.x)
       this.pan.add(this.objectUp.copy(this.object.up).setLength(this.mouseChange.y))