Add Mavic 3 rolling shutter, not enterprise version (#1747)

* Add Mavic 3 rolling shutter

* M3

opendm/gltf.py

@@ -279,9 +279,10 @@ def obj2glb(input_obj, output_glb, rtc=(None, None), draco_compression=True, _in
     )
 
     gltf.extensionsRequired = ['KHR_materials_unlit']
+    gltf.extensionsUsed = ['KHR_materials_unlit']
 
     if rtc != (None, None) and len(rtc) >= 2:
-        gltf.extensionsUsed = ['CESIUM_RTC', 'KHR_materials_unlit']
+        gltf.extensionsUsed.append('CESIUM_RTC')
         gltf.extensions = {
             'CESIUM_RTC': {
                 'center': [float(rtc[0]), float(rtc[1]), 0.0]

opendm/rollingshutter.py

@@ -19,6 +19,7 @@ RS_DATABASE = {
     
     'dji fc220': 64, # DJI Mavic Pro (Platinum)
     'hasselblad l1d-20c': lambda p: 47 if p.get_capture_megapixels() < 17 else 56, # DJI Mavic 2 Pro (at 16:10 => 16.8MP 47ms, at 3:2 => 19.9MP 56ms. 4:3 has 17.7MP with same image height as 3:2 which can be concluded as same sensor readout)
+    'hasselblad l2d-20c': 16.6, # DJI Mavic 3 (not enterprise version)
 
     'dji fc3582': lambda p: 26 if p.get_capture_megapixels() < 48 else 60, # DJI Mini 3 pro (at 48MP readout is 60ms, at 12MP it's 26ms)