How are mapAnchors positioned? about harp.gl HOT 15 CLOSED

@HHammerite , thanks for your bug report.

How are you adding the object to the mapAnchors ?

Setting the geoPosition should work, see the render method in MapView, specifically the line:
this.m_mapAnchors.children.forEach((childObject: MapAnchor) => {

We position all of the children relative to the camera. This is how all objects are rendered, the camera is then located at 0,0,0 and all objects are rendered relative to it.

However we don't position the mapAnchors object, its position would be at 0,0,0 in world space, so for example, if you are using globe projection, then the mapAnchors object would be position in the center of the world, but the children are positioned correctly.

Does that help?

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That has solved half of my problem! It is now correct. Thank you @nzjony! I just need to figure out the camera issue now.

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@HHammerite , great to hear!

What camera issue are you dealing with, we have an orbiting camera example here if it helps: https://www.harp.gl/docs/master/examples/#getting-started_orbiting-view.html

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@nzjony Thank you! What's the best way to keep updated on this?

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Cool, thank you @nzjony

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Here is another screenshot where I don't set the .geoPosition of the building after it's loaded.

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Hi @nzjony,

Thank you for your reply! I am adding the object to mapAnchors like this
map.mapAnchors.add(scene); where map is the mapView instance and scene is the main gltf scene.

That's good that the mapAnchors object is positioned at 0, 0, 0. This simplifies a lot.

I am adding the box helper like this
const box = new THREE.BoxHelper(scene); map.scene.add( box );

Is there a reason the box would be positioned like this?

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I am adding the box helper like this
const box = new THREE.BoxHelper(scene); map.scene.add( box );

I think I see the problem, because the MapAnchor is positioned relative to the camera, its position is updated each frame, you need to add an event listener to the map render call and update the box before it is rendered, something like:

map.addEventListener(MapViewEventNames.Render, () => {
    box.update();
 });

Does that help?

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@nzjony I've been using this Orbit Camera . However I'm struggling to set it's orbit position to the MapAnchor. If I using the regular orbit camera from three it works without any issues, just that the orbit axis is wrong.

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The reason I'm using this is because I need to set the camera's focus to specific parts of the building

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@HHammerite, can you try updating the target each frame, i.e. under the box.update();, make a call to set the target on the orbit controls?

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That works! Awesome @nzjony! Thanks for your help. I have to ask for future reference, is there a way to get around all this continuous assignment & updating to simply interact with a MapAnchor?

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@HHammerite , I agree that it is a bit cumbersome, i will create a separate ticket to improve the interface, as you say, it should be possible to just assign objects to the MapAnchor and not have to worry about updating their positions.

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I created an issue: #1371

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@HHammerite, otherwise can I close this issue?

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