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Scaling the model & density of point cloud in RCS for downstream operations

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keshavs
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Scaling the model & density of point cloud in RCS for downstream operations

Greetings,

 

As you might already know, or have encountered by doing some photo projects in ReCap360, the result you get doesn't have a real-life scale (or size.). That's because when you take a photo, it doesn't have a size/dimension, and the resulting 3D model from photos has a shape (or form), but not size.

 

You can assign size/dimension (or what we call "scale the scene") the following ways:

  • Assign a scale to the scene using capabilities in ReCap360. Look for an object of known size, e.g. a door frame. If your scene doesn't have such an object, place an object of known size, e.g. a credit card, in the areas of interest, while you're taking photos
  • Our program can find location information, e.g. GPS co-ordinates, from photos and automatically scale the scene. We DO NOT do this currently, but it's in our plans

Now that you have a scaled scene/object, you might want to export it to RCS (point cloud) to bring it into ReCap desktop. ReCap desktop also works with laser scan point cloud, which can cover much bigger areas. Therefore we have a "sampling density" for the point cloud, say, one point per millimeter. The point cloud engine that saves/reads RCS files is _THE SAME ONE_ used in ReCap desktop as well as ReCap360. Therefore, if the size of your scene/object is small in ReCap360, you might get few points in your RCS file, due to the sampling density.

 

One way to get a good-density point cloud from ReCap360 Photo would be to scale the scene to be big, say, several meters, then generate the RCS. You can always scale the scene back in ReCap360. You can also scale the resulting RCS back in a downstream application, e.g. ReCap desktop, AutoCAD or Revit. Think of scaling the scene big as a temporary, intermediate step to generate a high sample-rate so that you can get a high-density point cloud.

 

Regards,

Keshav

 

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