I exported the model as a single, tiny .bimx file. It was 12 megabytes. My original Revit file was 340. I emailed it to Tom with a note: “Open this in the free BIMx Viewer on your phone. Walk through the model. You’ll see the clash at Grid B3.”
He called back twenty minutes later. Not angry. Almost… impressed. “Elena, I’m standing in the actual building right now, looking at the real beam. And on my phone, I’m standing in your model. I just walked through the whole first floor. The duct is wrong. I see it. We’ll pour around it and box it out. Send the fix tonight.”
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The first result was the official Graphisoft page. No tricks. No hidden subscription. Just a clean, blue button: Download BIMx Viewer – Free . I clicked it with the reverence of a monk lighting a candle. I emailed it to Tom with a note:
On my laptop screen, the flat lines of my floor plan suddenly inflated . Walls gained thickness. Ductwork turned cylindrical. The steel beam—the one Tom was yelling about—appeared as a solid, grey I-shape. And there, threading through it like a snake through grass, was the HVAC duct. On the 2D PDF, they looked parallel. In the BIMx viewer, I orbited the view with a two-finger drag, zoomed in with a pinch, and my heart stopped. The duct wasn’t four inches above the beam. It was four inches through the beam. My model had a tolerance error I’d missed for three weeks.
“It’s fine,” I muttered, checking my Revit model. The beam was there. The duct was there. They didn’t clash. But Tom was staring at the concrete pour happening now , and he needed an answer in ten minutes. I couldn’t drag my gaming laptop to a muddy site. I couldn’t email him a 2D PDF and expect him to mentally orbit the clash in 3D. I needed something else.