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If I were a pixel, what would I do?
--client
lca
--show
lca2018
--room guthrie 13566 --force
Next: 14 On Writing Machines
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Marks
Author(s):
Harley Mellifont
Location
Guthrie Theatre CB06.03.28
Date
jan Tue 23
Days Raw Files
Start
11:35
First Raw Start
11:19
Duration
0:25:0
Offset
0:15:11
End
12:00
Last Raw End
12:19
Chapters
00:00
0:13:20
Total cuts_time
22 min.
http://lca2018.linux.org.au/schedule/presentation/148/
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In this talk, Harley explains the basics of raymarching -- a powerful technique that can be used to draw 3D scenes with a pixel shader. By using signed distance functions, we can describe the geometry of a scene in a succinct mathematical form. Raymarching allows us to step rays closer and closer to our geometry until we intersect and then colour our pixels according to our shading model. This technique is vastly expressive. Scenery from cityscapes to natural landscapes can be produced by aggregating simple mathematical rules. With surprisingly few mathematical operations, you can create remarkable variety, and by supplying temporal inputs like music and motion, you can create procedurally evolving scenery.
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