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Preparing your CAD data
These extra steps to arrange the CAD models to be used in AR visuals is mandatory for a few reasons. First, “CAD models are available various forms from various vendors,” says Aveva’s Richmond. “So, a typical first step is to translate the CAD files right into a form suitable for a 3D modeling tool similar to Blender,” an open-source toolkit for creating animation and 3D models.
Another reason for data preparation is that models built from CAD and other data are often too big for many AR devices to handle in real time. “Whether geometry, textures, sheets, or information drawn from bills of fabric, most of this data remains to be created by tools that should not have real-time consumption at the highest of mind,” explains Nicolas Fonta, senior product manager of augmented, virtual, and blend reality at Autodesk Inc. “CAD data, for instance, is commonly represented in a parametric way that will not be suitable for many real-time graphics. When meshed, the quantity of detail and determination of the information is difficult for a phone, tablet, or AR glasses to ingest and render in real time.”
The data, subsequently, should be reduced by some means. “You can take away the screws and other details that should not critical for the AR experience,” offers Mukherjee at Dassault. You can even cut out and use only the relevant portion of a machine or production line.
Until a number of years ago, most preparation of CAD data was done manually using tools like Autodesk 3ds Max, a process that required a measure of specialised knowledge, in keeping with Fonta. “More and more, nonetheless, partially automated solutions are emerging,” he says. “The best have been offshoots of the tools used to create video games and their 3D elements.” Also emerging are services for polygon reduction, level-of-details generation, texture remapping and compression, and streaming.
Even so, Fonta advises designers to create smaller and simpler CAD models from the outset, especially once they know that their models will likely be prone to be utilized in AR visuals. This means developing CAD models to have the only surfaces and fewest polygons possible. “It’s best to model efficiently from the beginning, relatively than try to diminish the polygon count later,” says Fonta. Such reductions after the very fact run the danger of erasing vital details.
Preparation can also be required for layering other, non-graphics data, like metadata or constructing information modeling (BIM) data, on top of graphics information. “BIM data, for instance, could be shown on top of a visible representation of a constructing,” says Fonta. “Or BOM information could be shown on top of visual representation of a consumer product, or IoT data layered on top of physical industrial machinery.”
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