Ultraviolet by HOOY-PROGRAM [web]
screenshot added by gasman on 2017-03-18 18:42:40
platform :
type :
release date : march 2017
release party : Forever 2017
compo : zx demo
ranked : 1st
  • rulez 32
  • is ok 2
  • sucks 0
popularity : 0%
  • rulez 0.94
alltime top: #5190
  • gasman gasman [Code, music, graphics]
added on the 2017-03-18 18:42:40 by gasman gasman

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rulez added on the 2017-03-18 19:04:44 by nyuk nyuk
This is - WONDERFUL!
rulez added on the 2017-03-18 19:29:53 by VBI VBI
Man, I loved it. Got worried at some point that you will steal all of my future effects, but it turned out you left me with one or two. That'll be enough :)

Great work, surely will be one of the best Spectrum releases this year. My only complaint - I thought that the water will wobble. Not forgetting Victoria (tm).
rulez added on the 2017-03-18 19:54:16 by introspec introspec
indeed, one of the best zx releases of this year. dat multicolor! =)

p.s. waiting for pentagonfix ;)
rulez added on the 2017-03-18 20:43:59 by wbc\\bz7 wbc\\bz7
Can't seem to get past the gamma stage. 6 and 7 alter gamma but don't know what to do to start. Tried all other keys. USP and Marvin emu both fail in same way. What do i do?
@bootlegger, I believe that the file for measuring gamma is only there to help people choose the correct executable - ultraviolet-gamma1.2.tap or ultraviolet-gamma2.4.tap. You are most likely to need ultraviolet-gamma2.4.tap
added on the 2017-03-18 23:34:34 by introspec introspec
Ta. Before i just loaded zip into emulator and that's all i got. Unpacked 1.2 and 2.4. didn't work in Marvin or USP very well so tried spectacol (android) which is based on fuse and it's almost perfect timings. Very impressive demo! Thx
Great work!
rulez added on the 2017-03-19 13:52:54 by TmK^deMarche TmK^deMarche
Now that is what I call a well deserved win... and kudos for finishing it at the party which is the hardcore demo coder way :)
rulez added on the 2017-03-19 15:29:51 by baze baze
I loved the fx and that new graphics mode a lot, very nice tune too!!
rulez added on the 2017-03-19 15:44:28 by Buckethead Buckethead
Nice stuff, also nice with a new graphics mode worked good in the FUSE emulator as i have no speccy
rulez added on the 2017-03-19 21:07:26 by Queen_Luna Queen_Luna
Ok, I want to see it in trdos / pentagon times / only one loading )
rulez added on the 2017-03-20 13:13:15 by SerzhSoft SerzhSoft
Really enjoyed this, for a one man prod this is an insane amount of effort.
rulez added on the 2017-03-20 22:57:25 by ruairi [rc55] ruairi [rc55]
rulez added on the 2017-03-20 23:11:57 by Ramon B5 Ramon B5
Shameless youtube link bump!

(Please watch in 720p50 quality where available. It's really quite important, especially for the end part)
added on the 2017-03-20 23:33:08 by gasman gasman
Amazing! All is top notch. And the music is awesome!
rulez added on the 2017-03-21 00:36:27 by mad mad
rulez added on the 2017-03-21 00:47:34 by psenough psenough
F-F-F-F-F-f-f- Wow!
rulez added on the 2017-03-21 01:19:26 by CiH CiH
Cool stuff!
rulez added on the 2017-03-21 08:22:59 by sachy sachy
Simple, sophisticated.
rulez added on the 2017-03-21 10:39:21 by noby noby
very nice gasman!
rulez added on the 2017-03-21 10:46:03 by megmeg megmeg
what positive things everybody said!
rulez added on the 2017-03-21 11:27:07 by 1in10 1in10
rulez added on the 2017-03-21 11:37:23 by kempy kempy
Hotdamn! What a show.
rulez added on the 2017-03-21 15:10:27 by utz utz
@gasman: your new 8x1 mode seem similar to the one present on the TO7 machines (7 colors, 8x1 color clash). I've designed a conversion technique that works well with 8x1 color clashes. It is available as LUA extension to GrafX2 >>here<<

Here is what the algorithm does on the same pictures you used with 7 fixed colors and 8x1 color clash
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If you wan't I can try to adapt it to the ZX.

By the way big thanks to you for your JS MOD player. It inspired me to make the MOD player presented at Forever-2017 for the TO8 machine.
rulez added on the 2017-03-21 15:41:13 by __sam__ __sam__
Well, actually it was not Gasman who invented this mode.
Here are some examples dated back to 2004:
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All those pictures were converted by Alone Coder and could be viewed with his MCX viewer
Some of the pictures were also used in his game Hexagonal Filler
added on the 2017-03-21 20:54:44 by lvd lvd
Kudos for coming up with such a nice demo all by yourself. And that new graphic mode sure looks impressive for the humble Speccy!
rulez added on the 2017-03-21 23:55:42 by exocet exocet
@LVD: Very interresting pics. They definitively have other colors than the basic 8+8. My guess is that these contains a palette of 16 colors out of 64 possible ones.

This doesn't look like Gasman's mode, does it? The youtube video seem to use only the 8+8 colors but with color clashes of only 1 pixel tall and 8 pixel wide (eg 8x1 attribute mode).
added on the 2017-03-22 01:07:44 by __sam__ __sam__
Really great work dudes!

Need to be proper digitized for YouTube - current version is heavy corrupted with compression even on 720p
rulez added on the 2017-03-22 02:00:42 by unbeliever^x7m unbeliever^x7m
Incredible demo! gasman rulez!
rulez added on the 2017-03-22 04:28:02 by Carbon- Carbon-
@Sam: the pictures use not one, but two frames with each 8x1 blocks using the spectrum palette.
The screenshots here are a mix of the two frames. Of course on real hardware it is a lot more blinking and flashing, but it works ok.
This is similar to what you did in TruC and what was done in Climax on CPC, too.
what PulkoMandy said, yes. I've screenshotted them using 'noflic' option in the emulator. Still havent' seen this demo on a real HW.
added on the 2017-03-22 08:36:01 by lvd lvd
@__sam__: As PulkoMandy says, my images are blending colours from two frames. If you're not seeing that in the youtube video, you're probably not viewing it at 50Hz... here's how the result should look (plus or minus flicker).

@lvd: Are those images full 8x1 attributes everywhere, or less than that (with an algorithm to find the optimal places to do the colour change)? Very impressive work either way! As far as I can remember my demo is the first one to combine 8x1 multicolour with interlace/gigascreen, but that's not such a revolutionary idea so I wouldn't be surprised to find out it's been done before. It's definitely the first time 8x1 attributes have been done in 22 columns on an original Sinclair Spectrum 128, interlaced or not... (Proper writeup to come soon!)
added on the 2017-03-22 08:49:21 by gasman gasman
I'm a total newbie on Spectrum. I wonder how I can view them in 50hz. I've tried speccy 3.9 but it flickers a lot at 50hz. With 60hz it is more stable but does not show that many colors. I presume this is all related to LCD display.

Mixing two images with 8x1 attribute lead to 5 intensities per components (0%=off/off, 25%=off/dimmed, 50%=dimmed/dimmed, 75%=bright/dimmed, 100%=bright/bright), so 125 cols max, but since some color combinations are forbidden on an 8x1 it's actually much less. I wonder what does the full palette looks like... Hum interesting topic :)
added on the 2017-03-22 09:15:08 by __sam__ __sam__
I'm quite averse to flicker regardless of platform, but apart from that it's a great show! I especially like the music.
rulez added on the 2017-03-22 09:27:24 by Kylearan Kylearan
lvd, does Alone Coder's method work on original Spectrum 128k machine?
added on the 2017-03-22 10:12:40 by sq sq
nice demo, i loved the twister and the tunnel!
rulez added on the 2017-03-22 10:13:05 by sq sq
Just watched on my +2.
Nice to see true british zx demoscene keeps up with latest technical innovations.
Also a very impressive and fascinating 'one-man-show'.

@gasman: sure they are not, 224 (or 228) clocks is just not enough to update 32 bytes with random values.

Also, I've watched this demo on my divIDE equipped with fatware and experienced some stalls. Does that mean that from now on, on Forever, IM2 divide loaders (that obviously require ESXDOS) are officially allowed, no 'have basic-only loaders' anymore?

ps: by using our gamma calibrator I've found, that checkerboarded bright color looks exactly the same as solid non-bright one (and thus gamma calculated was 2.4). Again, on +2 and CRT TV connected via SCART. So that means that I was right doing (or at least trying to) the same in our ZX Evolution design. In contrary with popular (mis)belief :)
rulez added on the 2017-03-22 13:25:44 by lvd lvd
s/our/your/ [gamma calibrator]
added on the 2017-03-22 13:26:54 by lvd lvd
Great stuff. I used ZXSpin's 'reduce gigascreen flicker' to watch the end part as I don't have a monitor that can do it. Looked pretty similar to the screenshot.
rulez added on the 2017-03-22 14:34:55 by 4mat 4mat
multicolour twister: rules
22 colum: rules
gigascreen + multicolour: rules
image transitition: rules
losing victoria: rules
losing victoria as a demo: rules *sniff*
zx spectrum: rules
hooy: rules
usr 0: sucks. There must be another way.

I definitely remember when you realized you don't have to update all 8 raster lines but just 7. But I still don't know when did you find a way to jump from 18 to 22?
rulez added on the 2017-03-22 21:16:51 by ref ref
...simply great, especially for a one man prod...
rulez added on the 2017-03-22 22:17:26 by Kuemmel Kuemmel
@lvd: The loading stutter happens on ESXDOS too (and thus happened during the compo). The demo was always planned to be an IM2 loader (I didn't check the compo rules - my bad...) but once I learned that leaving IM2 running during LOAD "" isn't enough, I didn't have time to do anything fancier. Something to fix for the final!

@ref: With the 128K second screen in use, you only need to update 6 of the lines "live". (That optimisation was introspec's idea...) The second screen is also a big help in avoiding 'tight spots' in timing - you can hammer away on a single screen for as long as possible, then switch screens just when you're about to run out of cycles. The final secret weapon to reach 22 was a data visualisation trick to show exactly where the contention delays occur, which meant I could hand-optimise the hell out of the instruction ordering...

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(btw, the demo works in full 128 mode as well as usr 0... doesn't it?)
added on the 2017-03-23 10:55:22 by gasman gasman
I don't know much about Spectrum architecture, but extra virtual thumb up for the screenshot of your data/instruction visualization spreadsheet. Having done hand-optimizations for my VCS prods in pretty much the same way, I know how much work that is (but also how rewarding it can be). :)
added on the 2017-03-23 13:24:05 by Kylearan Kylearan
Next challenge: play sidvoices/digidrums at the same time!
rulez added on the 2017-03-23 13:40:38 by PulkoMandy PulkoMandy
This is a great colorful demo with an interesting technic, I like it !
rulez added on the 2017-03-23 15:41:48 by Cyg_BLaBla Cyg_BLaBla

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