A measurement and schematic-generating system, comprising: a measurement tool including: a first tool member having a first plurality of fiducial markers that indicate a first point in space relative to the first tool member; a second tool member having a second plurality of fiducial markers, wherein each of the second plurality of fiducial markers indicates a respective second point in space relative to the second tool member; wherein the first tool member and the second tool member have a plurality of relative positions each having a corresponding relative geometric relationship between the first point and the second points; and a head-mounted display device including: one or more sensors (27, 28) configured to identify a first geometric position of the first point by identifying one or more of the first plurality of fiducial markers and identify one or more second geometric positions of one or more of the respective second points associated with placement of the first tool member and the second tool member relative to a surface of a real-world structure by identifying one or more of the second plurality of fiducial markers, wherein the first geometric position and the one or more second geometric positions are in a coordinate system relative to the head-mounted display device; one or more processors configured to calculate an initial dimension of a part of the real-world structure based on the first geometric position, and calculate, based on at least the one or more second geometric positions according to the relative geometric relationship with respect to the first point, a final dimension of the part of the real-world structure to validate or modify the initial dimension of the part of the real-world structure, wherein the relative geometric relationship with respect to the first point is known; and a near-eye display configured to display a virtual schematic diagram of the part of the real-world structure having the final dimension. a measurement tool including: a first tool member having a first plurality of fiducial markers that indicate a first point in space relative to the first tool member; a second tool member having a second plurality of fiducial markers, wherein each of the second plurality of fiducial markers indicates a respective second point in space relative to the second tool member; wherein the first tool member and the second tool member have a plurality of relative positions each having a corresponding relative geometric relationship between the first point and the second points; and a first tool member having a first plurality of fiducial markers that indicate a first point in space relative to the first tool member; a second tool member having a second plurality of fiducial markers, wherein each of the second plurality of fiducial markers indicates a respective second point in space relative to the second tool member; wherein the first tool member and the second tool member have a plurality of relative positions each having a corresponding relative geometric relationship between the first point and the second points; and a head-mounted display device including: one or more sensors (27, 28) configured to identify a first geometric position of the first point by identifying one or more of the first plurality of fiducial markers and identify one or more second geometric positions of one or more of the respective second points associated with placement of the first tool member and the second tool member relative to a surface of a real-world structure by identifying one or more of the second plurality of fiducial markers, wherein the first geometric position and the one or more second geometric positions are in a coordinate system relative to the head-mounted display device; one or more processors configured to calculate an initial dimension of a part of the real-world structure based on the first geometric position, and calculate, based on at least the one or more second geometric positions according to the relative geometric relationship with respect to the first point, a final dimension of the part of the real-world structure to validate or modify the initial dimension of the part of the real-world structure, wherein the relative geometric relationship with respect to the first point is known; and one or more sensors (27, 28) configured to identify a first geometric position of the first point by identifying one or more of the first plurality of fiducial markers and identify one or more second geometric positions of one or more of the respective second points associated with placement of the first tool member and the second tool member relative to a surface of a real-world structure by identifying one or more of the second plurality of fiducial markers, wherein the first geometric position and the one or more second geometric positions are in a coordinate system relative to the head-mounted display device; one or more processors configured to calculate an initial dimension of a part of the real-world structure based on the first geometric position, and calculate, based on at least the one or more second geometric positions according to the relative geometric relationship with respect to the first point, a final dimension of the part of the real-world structure to validate or modify the initial dimension of the part of the real-world structure, wherein the relative geometric relationship with respect to the first point is known; and a near-eye display configured to display a virtual schematic diagram of the part of the real-world structure having the final dimension.