1. tuned arrow mesh drawing

2. centralixzed arrow config in layout.py
3. seperate mesh render and display resolution to speed up (~40 fps)

config/dd02-ov.json

@@ -5,13 +5,13 @@
   "camera": {
     "resolution_raw": [1280, 720],
     "fps": 30,
-    "resolution_stitch": [672, 728],
+    "resolution_stitch": [420, 450],
     "source_scale": 0.4,
-    "old":[672, 728],
+    "old":[672, 728, 1,0.5],
     "work": [504, 546,1],
     "work2": [420, 450,0.8],
     "work3": [350, 375,4,0.7],
-    "work4": [280, 300,4,0.4]
+    "work4": [280, 300,4,0.4,0.2]
   },
   "tracker": {
     "adaptive": true,
@@ -26,8 +26,8 @@
   },
   "contact": {
     "min_contour_area": 3000,
-    "flow_threshold": 0.5,
-    "div_threshold": 0.03,
+    "flow_threshold": 0.2,
+    "div_threshold": 0.022,
     "expansion_threshold": 0.01,
     "kernel_size": [5, 5],
     "denoise_sigma": 12