问题:

I loaded some objects via OBJLoader , loaded object contain one parent and multiple childs; then I apply Raycaster and find clicked child.

Then I want to update position of child object, but initial position comes zero for all childs.

var intersect = intersects[0].object; intersect.position.y = intersect.position.y + 5; // 0 + 5

But in my scene all looks fine. Also, If i remove clicked object, actually it is removed from scene. I think I missed some point their positions cant be (0,0,0). How can I reach their relative position ?

回答1:

Try this, then read position(). I had the same issue, got an answer here. (geom is your Meshes geometry.)

objMesh.centroid = new THREE.Vector3(); for (var i = 0, l = geom.vertices.length; i < l; i++) {     objMesh.centroid.add(geom.vertices[i].clone()); } objMesh.centroid.divideScalar(geom.vertices.length); var offset = objMesh.centroid.clone();  objMesh.geometry.applyMatrix(new THREE.Matrix4().makeTranslation(-offset.x, -offset.y, -offset.z));  objMesh.position.copy(objMesh.centroid);

回答2:

The position is relative to the parent

Multiply the position by the transform of the parent to get the world-space coordinates, if that's what you're seeking

回答3:

That is because all objects in a obj file have their pivot at World 0,0,0 no matter where their local pivot was before exporting.

转载请标明出处:Three.js Child Mesh position always return (0,0,0)

文章来源: Three.js Child Mesh position always return (0,0,0)

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