Subject:
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Re: first multi-colored sculpture - rhapsody in blue
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Newsgroups:
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lugnet.build.sculpture
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Date:
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Fri, 13 Oct 2006 16:24:42 GMT
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In lugnet.build.sculpture, Tim David wrote:
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In lugnet.announce.moc, David Winkler wrote:
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At NWBrickCon2006 I showed my
first ever multi-colored sculpture.
It was a part of the moonbase display. It was an 8 foot tall cone with a
bulging red stripe spiraling up the side.
But the red stripe is structural. It’s not just tacked on the outside. It
may look boring to other people (after all it’s not
naked people), but it’s one of
my most important technical breakthroughs.
Comments welcome and appreciated.
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If this wasn’t Lego it would be boring, but somewhow the knowledge of how it
is constructed gives it that something extra . I think if you had worked out
some sort of studless super SNOT construction it just wouldn’t work. As a
matter of interest what is the technological breakthrough? I see it has a
standard corridor, whats inside it?
Re-reading this I realise it sounds a
bit negative, but trust me I don’t mean it to.
Tim
Perhaps you need a naked minifig climbing it (with helmet and airtanks of
course)!
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I will confess that the interior is empty.
The technological breakthrough was the ability to produce the color voxel
representation of the multi-colored object.
To transform objects into voxels I had been rendering slices through them. (page
7 of
http://www.brickshelf.com/gallery/happyfrosh/BrickFest2005/automatedbricklayout.pdf)
But this doesn’t work for color... sort of. What I had to do instead is render
the object through Pov-Ray from each of the directions (+-x, +-y, +-z), then
merge the output to get multiple votes on what color each voxel should be.
Playing with it I end up using 3x3 pixels per side of each voxel for 9*6=54
votes per voxel.
Then these voxels go through hollowing software to identify the voxels visible
from the exterior. All of the interior voxels are marked as “don’t care”, and
the filling software uses them how it sees fit to minimize expesive pieces or to
improve structure. (I had made extensive use of “don’t care” for the
globes but the voxels for those
models had been done using techniques that really only worked for spheres)
-David Winkler
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