Picking on TileLayer should return more informations

[gliegard]

Picking on the TileLayer should returns

• point
• distance
• face (with face.normal)

like other picking method.

Context

In StreetControls, it was hard to implement picking to detect ground.
I did a workaround using method view.getPickingPositionFromDepth to get to picked point on tile layer, and then compute the distance. But code would be clearer if the picking method for TileLayer was homogeneous with other picking method. For example :

this.view.pickObjectsAt(event, 0, this.buildingsLayer);

works normally, and return all picking information (point, distance, face, object...)

0: {distance: 10.782635729449, point: Vector3, object: Mesh, face: Face3, faceIndex: 5471, …}
1: {distance: 20.35449612122636, point: Vector3, object: Mesh, face: Face3, faceIndex: 5469, …}
2: {distance: 20.42226457707133, point: Vector3, object: Mesh, face: Face3, faceIndex: 5404, …}
3: {distance: 23.65226947256359, point: Vector3, object: Mesh, face: Face3, faceIndex: 5394, …}

this.view.pickObjectsAt(event, 0, this.view.tileLayer);

0: {object: TileMesh, layer: GlobeLayer}

Steps to Reproduce

In StreetControl, method pick,
Add log to see what view.pickObjectAt returns in each case, for building layer or for tile layer.

console.log(intersectsBuildings);
console.log(intersectsGround);

Expected Behavior

0: {distance: 10.782635729449, point: Vector3, object: Mesh, face: Face3, faceIndex: 5471, …}

Actual Behavior

0: {object: TileMesh, layer: GlobeLayer}

Possible Cause/Fix/Solution

Picking.pickTilesAt need to be improved

[jailln]

I modified the picking methods in #1881 so that their return is more homogeneous. Let me know if it fixes this issue.