Place tool
Use the Place tool 
to position an object accurately on the surface of another
object.
To place a single object, you have to select it first. You may select object while Select mode is active or with single click with Place tool. The contact point with the underlying surface by default is the object's pivot point. To use the object's base as the contact point instead, select Bottom of Object in Tool Inspector panel.
As you drag an object, its orientation can change, based on the normal of the underlying surface and the Object Up Axis setting. So, for example, with the default +Z setting, the FinalMesh continually aligns the object's local Z axis with the underlying surface normal, rotating the object along with its local axis.
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Place tool can be used to align flat object with surface of second object |
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At the same, non flat object can be perfectly placed on surface of the same object. |
Additional options are avaiable in Tool Inspector Panel. These options include:
| Rotation around selected local axis |
| Offset from underlying surface |
| Local axis: +X,+Y,+Z, -X,-Y,-Z |
| Aligning with pivot point or bottom (base) of the object |