From 90748d1e6ed403b550d313ded5b1895be70591a8 Mon Sep 17 00:00:00 2001
From: Stewart Allen <sa@grid.space>
Date: Tue, 16 Dec 2025 18:51:42 -0500
Subject: [PATCH] fix ortho zoom behvavior and min zoom distance

---
 src/moto/orbit.js | 18 ++++++++++++++++--
 src/moto/space.js |  7 ++++++-
 2 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/src/moto/orbit.js b/src/moto/orbit.js
index 097e7f0b..74dd86b7 100644
--- a/src/moto/orbit.js
+++ b/src/moto/orbit.js
@@ -315,6 +315,7 @@ class Orbit extends EventDispatcher {
                 scaleSave = newScaleSave;
                 scope.object.zoom = 1 / scaleSave;
                 scope.object.updateProjectionMatrix();
+                scale = 1; // Reset scale to prevent accumulation
             } else {
                 scaleSave *= scale;
                 scale = 1;
@@ -468,10 +469,23 @@ class Orbit extends EventDispatcher {
                 delta = -delta;
             }
 
+            // Use delta magnitude as factor for smoother trackpad scrolling
+            // Scale down large deltas more aggressively for smoother control
+            let absDelta = Math.abs(delta);
+            let factor = 1;
+
+            // For typical trackpad deltas (0-20), use linear scaling
+            if (absDelta <= 20) {
+                factor = absDelta / 20;
+            } else {
+                // For larger deltas (mouse wheel clicks), use smaller steps
+                factor = 1 + Math.log(absDelta / 20);
+            }
+
             if (delta > 0) {
-                scope.dollyOut();
+                scope.dollyOut(factor);
             } else if (delta < 0) {
-                scope.dollyIn();
+                scope.dollyIn(factor);
             }
 
             scope.update();
diff --git a/src/moto/space.js b/src/moto/space.js
index da94a180..833b80db 100644
--- a/src/moto/space.js
+++ b/src/moto/space.js
@@ -337,7 +337,9 @@ function setPlatformSize(
     } else {
         platform.scale.set(width, depth, height);
     }
-    viewControl.maxDistance = Math.max(width,depth) * 4;
+    let maxDim = Math.max(width,depth);
+    viewControl.minDistance = 1;
+    viewControl.maxDistance = maxDim * 4;
     updatePlatformPosition();
     updateLights();
     if (volume) {
@@ -1491,6 +1493,7 @@ let Space = {
         newCamera.lookAt(target);
 
         // Store old control properties
+        const minDistance = viewControl.minDistance;
         const maxDistance = viewControl.maxDistance;
         const noKeys = viewControl.noKeys;
         const enabled = viewControl.enabled;
@@ -1535,6 +1538,7 @@ let Space = {
             if (sliderCallback) sliderCallback(val);
         });
         viewControl.noKeys = noKeys;
+        viewControl.minDistance = minDistance;
         viewControl.maxDistance = maxDistance;
         viewControl.enabled = enabled;
         viewControl.reverseZoom = reverseZoom;
@@ -1620,6 +1624,7 @@ let Space = {
         });
 
         viewControl.noKeys = true;
+        viewControl.minDistance = 1;
         viewControl.maxDistance = 1000;
 
         SCENE.add(skyAmbient = new THREE.AmbientLight(0x707070));