How can I align the Orthoprojection box exactly to a buildings side?

Development Asset Creation
1

I have a model of a building and its yard with real world coordinates, since it is created using real world ground control points coordinates.

I want to create an orthoprojection (Type: Side) of one wall of the building. Like with almost all real buildings, my building’s sides are not aligned to north. So, to get the orthoprojection of the wall of the building I have to rotate the box of the orthoprojection by changing the roll parameter. The problem is that this way (and by trial and error) you might get an orthoprojection that looks parallel to the building side, but it is not such. To get it exactly parallel is necessary for orthoprojections to be used for professional architectural work.

Can somehow exact alignment of the orthoprojection box to a building side be achieved?

2

Hi GeorgeSurveyor,

this couldn’t be done automatically, but there is one possible workaround.

First, create control points on the beginning a ending side of your walls. It will be better, when these control points will be in one height.

Then, in Mesh model tab/Pre-steps (optional)/Set reconstruction region there is an option Set region from control points:

You can use these created control points for Reconstruction region creation, which will be the base for ortho view creation. You will need three control points for reconstruction region creation. After its creation, you can change the size of the region and it will be parallel to a wall with two CPs.

If the created CPs won’t be in one height, the reconstruction region will be rotated. So it is possible to use these CPs as GCPs with exact coordinates and the same height.

Hope this will help you.

3

Thanks for the answer.

By saying “create control points on the beginning a ending side of your walls. It will be better, when these control points will be in one height.”, could you be more specific? I should place the points on one photo, right? How could I assure that the height is the same? Could I place them on the bottom corners of 2 windows that are at the same height?

4

Yes, you need to place these CPs on the photos. But not just one. It is better to place these on more images (minimally three from various views on this CP). More about CPs you can find here: https://www.youtube.com/watch?v=S00_mLfbx6o&t=570s

About the height, you can use these CPs as GCPs with coordinates and same height. You need to firstly export these CPs (https://support.capturingreality.com/hc/en-us/articles/360012872579-Export-Control-points-with-XYZ-coordinates), change the height to the same value and then import as GCPs.

You can also use the windows for this, but try to achieve the highest possible distance between these points.