# Axis or plane constraints

Hi,

It would be enormously useful to be able to specify orientation using axis or plane constraints.

Axis constraint: these two points lie on the x/y/z axis.

Plane constraint: these 3 (or possibly more) points lie in the xy/yz/xz plane.

I've been testing use of a 5 point laser level to acquire orientation (particularly z axis) data in the field. It's very promising, but getting the data into RC is currently a bit more difficult than it could be.

A typical use would be to pick the down and up points from the laser level as the z axis, and to add distance constraints between these and/or other pairs points, with distances measured in the field with a disto.

At the moment I can use a triangular set of distances in the xy plane and resolve those into 3D coordinates (with fixed z) to provide as GCPs. That's a bit awkward, though, and I'd rather not constrain the origin or x, y axes this way as I might want to use other features for that - e.g. use the laser to define z, and align x with a wall of the scanned space.

Regards,

Hamish

It would be enormously useful to be able to specify orientation using axis or plane constraints.

Axis constraint: these two points lie on the x/y/z axis.

Plane constraint: these 3 (or possibly more) points lie in the xy/yz/xz plane.

I've been testing use of a 5 point laser level to acquire orientation (particularly z axis) data in the field. It's very promising, but getting the data into RC is currently a bit more difficult than it could be.

A typical use would be to pick the down and up points from the laser level as the z axis, and to add distance constraints between these and/or other pairs points, with distances measured in the field with a disto.

At the moment I can use a triangular set of distances in the xy plane and resolve those into 3D coordinates (with fixed z) to provide as GCPs. That's a bit awkward, though, and I'd rather not constrain the origin or x, y axes this way as I might want to use other features for that - e.g. use the laser to define z, and align x with a wall of the scanned space.

Regards,

Hamish

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