@Moises_Herrera
You are welcome! I am happy to help out.
Regarding the issue you mentioned on GitHub, I will check in with the rest of the Cesium development team and try to determine a timeline for when the issue will be addressed.
opened 12:35PM - 30 Jul 21 UTC
Based on several posts that have been generated during the last few months and c… arrying out new tests with various mobile devices on Android, we have detected a problem with the polygons campled to ground over 3D tiles or Terrain. Polygons don't draw well when viewed on mobile devices.
When approaching (close) you can notice that areas of the polygon disappear.
More details can be seen in @tonycedeno post
[https://community.cesium.com/t/problems-with-clamped-polygons-on-mobile-devices/14627](https://community.cesium.com/t/problems-with-clamped-polygons-on-mobile-devices/14627)
Sandcastle examples:
[Original Sandcastle](https://sandcastle.cesium.com/?src=Clamp%20to%20Terrain.html)
In the following link from sandcastle you can see that when zoom-in near the polygon “Draw Polygon” option also has this erratic behavior
You can see this behavior on this Story hosted in Cesium ION:
[Story](https://cesium.com/ion/stories/viewer/?id=543fab97-f74d-42eb-9368-f772dd50340b)
**Related issues already closed:**
Some posts that could be related and that are closed: #7273 #8953 #6735
On the other hand I have noticed that using 3d-tiles with classification have a similar behavior.
**Browser:** Google Chrome
Operating System: Android 10
**Devices tested:**
- Samsung S20+
- Samsung S20 Ultra
- Huawei P20 Lite
- Samsung Galaxy Tab
**CesiumJS** version 1.83
Any type of help that you can offer us to solve this issue will be very helpful since the functionality of showing clamped to ground entities is one of the main ones to visualize on mobile phones.
Best
Moses
In terms of disabling the camera collisions with the terrain, have you had the chance to check out the following resources?
I would start with these resources. The first thread includes a link to the “Camera underground controls” pull request which was merged last year. This will help you get up to speed on the capabilities of the new feature.
CesiumGS:master ← CesiumGS:camera-underground-controls
opened 04:03PM - 29 Apr 20 UTC
Opening this PR for early testing. There's still some work to be done, especiall… y for panning. While I had the urge to rewrite `ScreenSpaceCameraController` I took the opposite approach and just modified camera behavior when underground. Above ground controls should be the mostly same, for better or for worse.
At a high level the changes include:
- Added ability to zoom into the ground, like submerging below the terrain. This happens by default if `enableCollisionDetection` is false and `minimumZoomDistance` is greater than 0.0. I'm occasionally noticing large jumps which I still need to fix.
- Changed zooming, rotating, and panning behavior when underground. There's a new property in `ScreenSpaceCameraController` called `undergroundSurfaceHeight` which acts as an invisible ellipsoid that's used to improve camera navigation when underground. For best results the height should be set just below the height of underground entities in the scene.
- When underground, the zoom distance is now determined by the position over the mouse's cursor rather than the position at the center of the screen. This should make it a lot easier to navigate to underground datasets.
- Fixed what seemed like a kludge in the camera panning code which had the side effect of panning every other frame. Basically panning felt like 30hz while other camera controls felt like 60hz. Panning feels so much smoother now.
[Local sandcastle for testing](http://localhost:8080/Apps/Sandcastle/index.html#c=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)
@fredj @gberaudo
Let me know if you have any other questions! I am looking forward to learning more about your project.
-Sam
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