From 6b85e44b67b10794fe6c536935bac8116d2ba1ab Mon Sep 17 00:00:00 2001
From: Stewart Allen <sa@grid.space>
Date: Wed, 28 Dec 2022 11:00:20 -0500
Subject: [PATCH] improve trace/line selection precision on zoom

---
 src/kiri-mode/cam/client.js | 8 ++++----
 src/moto/space.js           | 5 +++++
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/kiri-mode/cam/client.js b/src/kiri-mode/cam/client.js
index 26c1a529..a8326a49 100644
--- a/src/kiri-mode/cam/client.js
+++ b/src/kiri-mode/cam/client.js
@@ -986,7 +986,7 @@ CAM.init = function(kiri, api) {
             color.r = colorSave.r;
             color.g = colorSave.g;
             color.b = colorSave.b;
-            lastTrace.position.z -= 0.05;
+            lastTrace.position.z -= 0.01;
         }
         if (data.type === 'platform') {
             lastTrace = null;
@@ -996,7 +996,7 @@ CAM.init = function(kiri, api) {
             return;
         }
         lastTrace = data.int.object;
-        lastTrace.position.z += 0.05;
+        lastTrace.position.z += 0.01;
         if (lastTrace.selected) {
             let event = data.event;
             let target = event.target;
@@ -1043,13 +1043,13 @@ CAM.init = function(kiri, api) {
             };
         }
         if (obj.selected) {
-            obj.position.z += 0.05;
+            obj.position.z += 0.01;
             color.r = colorSave.r = 0.9;
             color.g = colorSave.g = 0;
             color.b = colorSave.b = 0.1;
             if (!skip) wlist.push(poly._trace);
         } else {
-            obj.position.z -= 0.05;
+            obj.position.z -= 0.01;
             color.r = colorSave.r = 0xaa/255;
             color.g = colorSave.g = 0xaa/255;
             color.b = colorSave.b = 0x55/255;
diff --git a/src/moto/space.js b/src/moto/space.js
index d370bd17..dafc3679 100644
--- a/src/moto/space.js
+++ b/src/moto/space.js
@@ -1368,6 +1368,11 @@ gapp.register("moto.space", [], (root, exports) => {
                 updateLastAction();
                 updateFocus();
             }, (val) => {
+                if (camera && viewControl) {
+                    // increase intersect line precision on zoom
+                    const dist = camera.position.distanceTo(viewControl.target);
+                    raycaster.params.Line.threshold = Math.min(1, dist / 100);
+                }
                 updateLastAction();
                 if (slider) slider(val);
             });