Check if photo reference is scaled or not?

Rhino Rhino for Windows
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1

I imported a few images as photo references (picture command). I scaled one of them (scale1D). I don`t remember which. How to determine which is scaled without reloading everything? How to reset the scale of an imported picture to the base dimension?

2

In principle you cannot, since Rhino doesn’t store these transformations. If however your pictures have a known aspect ratio, it should be possible to make a script to detect it

1 Like
3

Thanks

4

_Picture attaches the image to a Plane Surface. If it is non-uniformly scaled, the surface will be converted to NURBS. Therefore, use _What to check the surface type.

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5

Hi @mdesign

here a simple check with python:

import rhinoscriptsyntax as rs
picture_id = rs.GetObject("Select Picture")
if picture_id:
    u,v = rs.SurfaceParameter(picture_id, (1,1))
    pts = rs.SurfacePoints(picture_id)
    x = rs.Distance(pts[0],pts[2])
    y = rs.Distance(pts[0],pts[1])
    if abs(u/v - x/y) > 0.01: #tolerance
        print ("picture scaled non-uniform")
    else:
        print ("picture is proportional")
1 Like
6

Brilliant!!