slisesix by Rgba [web]
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slisesix
executable 3k9 graphics by rgba [www.rgba.org] 2008
for euskal 16
.blahblahing.
time goes fast, now is my 10th demoscener anniversary. much has changed
in these ten years. that small scener party i attended back then became
a big meeting of four thousand people today where i feel i don't really
feet. however euskal means something special and i will be there with a
new release exacly ten years later. at euskal 6 with that my first prod
i had that strange mix of satisfaction for releasing and unsatisfaction
because i knew i could do better. it seems some things haven't changed,
i release this procedural graphics by knowing, once again, i could have
done better. technically i wish i could have achieved the photo realism
i wanted. artistically, well, so much still to learn. i also wish i had
more time to add some details and improved things. but i'm happy too, i
managed to release once again something that i like.
the name of the gfx comes from this presentation for inspire 2008 about
procedural graphics, where i showed a preview of it in the slide number
76. [ http://www.rgba.org/iq/divulgation/inspire2008/inspire2008.htm ].
that's the reason for the name of the production.
.the.real.deal.
this is some cpu raymarching on a big 3d scalar field. no rasterization
nor primitive intersections are used. there is a big math function that
tells the distance to the closest surface at any 3d point in space. you
can then evaluate the function to guess how much you can safely advance
before eventually hitting any surface and so take the step. i call this
"rendering with distance field", i wonder what is the official techical
name for it.
the interesting part is that since you can evaluate the distance to the
surface at any point you actually have some non local information about
the geometry, without casting any secondary rays. or in other words you
can do non local lighting effects like softshadows or ambient occlusion
without the cost of resorting to additional rays. and that's sweet.
for the rest, shaders are pretty basic. the marble is particularly dull
for example. lighting could be improved but the image renders so slowly
even if it's all multithreaded that adjusting parameters takes ages, so
this is what i could manage to get in a reasonable amount of time (note
"reasonable" might not mean the same for all of us...)
the image is rendered with (up to 2x2) supersampling (it's adaptive) in
roughtly fourty seconds on a desktop dualcore machine. i have tried too
to port the complete thing to both glsl and hlsl and then the rendering
reaches around two frames per second in my geforce 8600. the problem is
the driver needs twenty seconds to compile the shader. precompiling the
shader is neither a good idea cause the binary shader expands into nine
thousand instructions (and i have to time for trying stream reordering)
what obviously makes the exe larger than 4k.
.extras.
twelve creation steps
[ http://www.rgba.org/prods/rgba_slisesix_steps.zip ]
somehow inspired by the mines of Moria
[ http://forum.valinor.com.br/attachment.php?attachmentid=11845 ]
.greetings.
asd auld bixo calodox collapse conspiracy [d]vision farbrausch
fairlight fuzzion kakiarts loonies necrostudio nocturns plastic
rebels skim software failure speckdrumm spontz stravaganza tbc
tbl timescratchers traction xplsv zona neutra and forgoten
.credits.
codepainting :: iq :: [ www.rgba.org/iq ]
crinklering :: mentor+blueberry :: [ www.crinkler.net ]
[ back to the prod ]