Jul 31 2008

OpenSim LiDAR sculpties – too much of a good thing?

Wow it has been a lot of effort to get the 40 regions built out with their LiDAR surface sculpties. Someday when the process gets automated I’ll look back and likely feel like a fool for not loading the BLOBs in MySQL directly, and coding the XML to load these directly. But I built them by hand, using 64-prim linked sets that covered each region. Region-wide linking works fine when the Admin settings are used to “go to God”. Also there’s a new SL client that works OK and helped a wee bit with the build.

My priority is to create good graphics for large-format display, but I’ve posted a rush of the first end-to end plod by the Ruth named “UC08 Visitor2”. At the moment, I’m still a bit shaky about just how solid the sim will be for demonstration purposes. None of he LiDAR surface sculpties are physical; I’ve been able to turn on ODE. I can’t bear the time to let the sculpties get meshed so there’s none of the cool walking on them, but I have tried boosting the detail settings to 64, in hopes that perhaps the sim will put out 4096 points per sculptie [my bump-maps to define each one are 16K so there’s plenty of info behind the detail boost.

As usual, if YouTube is blocked or you don’t have flash in the browser that you read this with, the video is here: http://www.youtube.com/v/srwRPgjFjnQ

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Jul 22 2008

OpenSim – First LiDAR reflective DEM sculpties placed

OK, not everyone in the immersive modeling universe has been holding their breath on this one, but hey, I’m happy to say that the production line is fired up and creating 2560 sculptie bumpmaps to inflate the Open Berkurodam sim using LiDAR reflective digital elevation model (DEM). The registration with orthoimagery is not perfect, and small offsets are very distracting, but the first two have been placed, and should illustrate the concept. (Two rezzed, 2558 to go…)

Sather Tower as two reflective digital elevation model sculpties

The reflective DEM sculpties have 16 times greater resolution (that’s resolution as NURB point density) than the underlying terrain megaprims. This means that for the 40-region Open Berkurodam sim, there are 160 terrain megaprims, and 160 tiles of 10-cm orthoimagery. The reflective DEM sculpties number 2560 and will be textured using the same orthoimagery.

Reflective DEM surfaces ride over the tops of trees, rooftops, or any structure. They are defined by the first return of the LiDAR reflected signal. By contrast, the terrain megaprims are based on a model of the last return (in these data up to the seventh return signal) that represents the ground under and around all structures and trees.

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