Camera Controls for Navigation Widget #4
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| zoom3D(object); | ||
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| NavigationViewModel.prototype.update = function(mode) { |
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Hi Ravi, try adding some code here at the top of update to cause the zoom ring pointer to go back home:
if (!this.zoomRingDragging) {
if (Math.abs(this.zoomRingAngle) > CesiumMath.EPSILON3) {
this.zoomRingAngle *= 0.9;
} else {
this.zoomRingAngle = 0;
}
}
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The above is frame-rate-dependent which might mean it bounces back too slowly on low-FPS systems. The code could be upgraded by computing the number of milliseconds since the last call to update(), and replace the 3rd line above with:
this.zoomRingAngle *= Math.pow(0.994, millisecondsSinceLastUpdate);
Of course don't update if number of milliseconds is zero, and clamp the max value of milliseconds to 5000 or so. You can adjust the constant 0.994 to find a speed that 'feels' nice (but this is a number I've used on other projects before).
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I can get why this is required but I am not sure how we can track milliseconds. Can you please elaborate on the same?
| var camera = object._cameraController._camera; | ||
| var ellipsoid = object._ellipsoid; | ||
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| var height = ellipsoid.cartesianToCartographic(camera.position).height; |
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@emackey
This returns an ambiguous value on the first call after clicking on the orbit line in simple.czml. A very large negative value is returned however a positive value is expected. The negative value messes up with the normal functioning of the camera.
I already tried to figure out the problem but couldn't. It would really help if you could look into this.
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Change camera.position to camera.getPositionWC(). When the camera is following an object, its position is only a few kilometers away. You need getPositionWC() to convert that small number to world coordinates, otherwise it thinks you're near the center of the Earth.
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In this case when we Zoom In.. It crosses the satellite being tracked and makes it disappear which shouldn't be happening I guess. The reason for this is that it thinks, it still has a lot of space to zoom in. Is there a way to find out the distance between the camera and the satellite being tracked? I think this should solve the issue.
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@bagnell can you take a look at this?
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What is ellipsoid? If the camera isn't following an object, it should probably be Ellipsoid.WGS84. If it is following an object, it should be Ellipsoid.UNIT_SPHERE.
Conflicts: Source/Widgets/Viewer/viewerDynamicObjectMixin.js
Navigation camera - conflict resolution
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