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Visible Distance

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Hi, yay - my first post! I'm fairly new to D3D, and having followed several tutorials I've started to play around with a few of my own ideas. For my current project, I need to be able calculate the distance at which an object would no longer be visible (based on its bounding radius) as part of my LoD scheme. I've been trying to figure out the required formula based on the distance at which an object displays as only 1 pixel. I had reasoned something along the following lines: critical_distance = bounding_radius/Tan(field_of_view / 2*resolution) but this doesn't seem to work. Does anyone know how to correctly find this distance? Many thanks, Mark PS: It's now 4am, so I hope this post makes sense :S

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