screenSpaceCameraController.maximumZoomDistance not work,when I set enableCollisionDetection to false.

[andy259]

I wanted maximumZoomDistance working on any case.But when I set enableCollisionDetection to false,camera can higher than maximumZoomDistance value.

Sandcastle example: here is the example

The code is below:

const viewer = new Cesium.Viewer("cesiumContainer");
viewer.scene.camera.setView({
    destination : Cesium.Cartesian3.fromDegrees(-117.16, 32.71, 15000.0)
});
viewer.scene.screenSpaceCameraController.maximumZoomDistance = 300000;

Sandcastle.addToolbarButton("EnableCollisionDetection", function () {
   viewer.scene.screenSpaceCameraController.enableCollisionDetection = true;
});

Sandcastle.addToolbarButton("DisableCollisionDetection", function () {
   viewer.scene.screenSpaceCameraController.enableCollisionDetection = false;
});

Browser: Chrome 100.0.4896.88

Operating System: Windows 11, 22000.613

[ggetz]

I believe this may be by design. If you look at the source code, we explicitly check for enableCollisionDetection before adjusting for the maximumZoomDistance. If its true the behavior is intentional, it's not documented. So I think the right thing to do here is leave the behavior as is, but update the documentation to make it clear that enableCollisionDetection effects maximumZoomDistance and minimumZoomDistance

[andy259]

I don't understand why it's designed this way.

I believe this may be by design. If you look at the source code, we explicitly check for enableCollisionDetection before adjusting for the maximumZoomDistance. If its true the behavior is intentional, it's not documented. So I think the right thing to do here is leave the behavior as is, but update the documentation to make it clear that enableCollisionDetection effects maximumZoomDistance and minimumZoomDistance

[ggetz]

enableCollisionDetection is working as an on/off switch for all camera limits, including minimum zoom, maximum zoom, and collision with terrain.

Could you describe your use case in more detail? There's been some interest in taking a look at the camera API in general to make it easier to use, and knowing more could help that effort.

[andy259]

Thanks @ggetz
In my case,my scene is a small area and I have some model in the underground.
So,I both limited user maximum zoom distance and user can go undergound the globe.

enableCollisionDetection is working as an on/off switch for all camera limits, including minimum zoom, maximum zoom, and collision with terrain.

Could you describe your use case in more detail? There's been some interest in taking a look at the camera API in general to make it easier to use, and knowing more could help that effort.