The idea came to me, and I tried it.
Useful when you need a .dxf of an odd-shaped item for routing, e-
The grid is a diffuser for suspended ceiling fluorescent lighting
The grid spacing, in this case, is in mm and easily scaled.
This one was for a customer who wanted to use this sink because it fit
It could be used for lots of things, I think.
Right. Since you'd have to know the grid size and size the picture to
make it work, wouldn't it be just as easy to take the picture, with a
straight rule in frame, and then overlay an appropriately dimensioned
grid in SketchUp, then export the DXF?
Well, I guess that's true of any lens - you have to know it's
limitations and compensate for them. You've taken a step in the right
direction. You're in the jet age, but I think you need to join the
Why? And put a number on "very limited". If it's a fixed focal
length lens and you have two rulers, I don't see any real world
difference in accuracy between the diffuser grid and the rulers.
'cept I usually have a couple rulers laying around and a ruler's line
marking are easier to determine than a diffuser's edges.
For openers, you'd have to be sure that the rule is perfectly planar
to your imaging device, and that the second rule is coordinated with a
known angle (usually 90-degrees), also planar to the imaging device.
All of this is old hat, btw.
My little grid helper will be useful to some.
Not exactly an insurmountable problem - I could probably scare up a
square, use a newspaper or do any number of other things to get a 90.
As far as the planar issue, how is that different than the diffuser?
That's an issue with any photographic measurement technique.
A steel rule is less than 1/16" of an inch thick - for all intents
flat. Not so with a diffuser. A diffuser has depth that won't help
the situation. The center of your photograph with the diffuser will
be normal to the lens, but the further from the center the bigger the
distortion with a grid that has an appreciable thickness.
No doubt, I'm not arguing that. It's quick and more than reasonably
effective for a down and dirty grid layout. I'll keep my eyes open
for a diffuser getting tossed.
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