When I have a moving object controlled by code such as:
dx = [not important];
dy = [not important];
dz = [not important];
d = new THREE.Vector3(dx, dy, dz);
mesh.postion.add(d);
How can I ensure that my mesh is facing the direction it's moving in? I've attempted:
mesh.lookAt(d); // without success
mesh.lookAt(copyOfMeshPosition.add(d)) // without success
as well as adjusting the mesh.up to (1,0,0), (0,1,0), and (0,0,1).
The issue you're facing is that when using the lookAt method, it requires a coordinate in world space rather than local space.
For example, if you want an object positioned at (3, 5, 0) to face towards the direction of (dx, dy, dz), you'll need to make sure you specify a point in that direction using world coordinates.
So, the point to look at would be calculated as (3, 5, 0) + (dx, dy, dz)
Here's an illustration:
d = new THREE.Vector3(dx, dy, dz);
mesh.postion.add(d);
mesh.lookAt(new THREE.Vector3().addVectors(mesh.position, d));
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