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Luca
Registered: Apr 2002
Posts: 178 |
Twister's primer
How to obtain simple/cool/elaborate primer graphics (bitmap) for a general vertical twister effect (let's say simply 3 colours+background colour)? Should I draw'em on PC first, with a 3DMax or similars, then convert'em? Which height in pixels would be enough to smoothly describe and include the whole 360° rotation?
For a very basic one, I could simply draw a slice of column in two colours by drawing them with a sin(x) function, what with more complex stuff? |
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Oswald
Registered: Apr 2002
Posts: 5094 |
sprite fpp is a wonderful thing indeed :) who invented it btw? |
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WVL
Registered: Mar 2002
Posts: 902 |
I honestly don't know :( I didnt know about it until Royal Arte, but I'm sure it has been used plenty of times before that.. |
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SIDWAVE
Account closed
Registered: Apr 2002
Posts: 2238 |
There is no twister, its just to print some chars that animate so they look like twisting, using a pretyped char index table, sorry to break your dreams :D |
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Skate
Registered: Jul 2003
Posts: 494 |
FPP is a very old effect.
http://www.codebase64.org/doku.php?id=base:demo_world_records_a..
Codebase64 says it's from 1989, I think it might even be older. |
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Radiant
Registered: Sep 2004
Posts: 639 |
FPP != sprite FPP.
Coding your own raytracer for generating the twister graphics isn't a bad idea. You can always touch the result up manually afterwards if you want to. The graphics for the "twister" in Patterns was generated by simply texturemapping a cylinder with different texture offsets. |
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Oswald
Registered: Apr 2002
Posts: 5094 |
"Coding your own raytracer for generating the twister graphics isn't a bad idea."
its like coding your own ext editor for the twister's code... |
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JackAsser
Registered: Jun 2002
Posts: 2014 |
Quote: "Coding your own raytracer for generating the twister graphics isn't a bad idea."
its like coding your own ext editor for the twister's code...
I see your point, however, it's not valid to me. For me, learning some 3d program to generate the gfx takes longer than doing a simple raytracer. However, as complexity of the objects increases, using a real tool becomes more and more sane. F.e. the wireframe cube in Andropolis was generated using povray. (And now that I know povray I don't think I'd make my own raytracer again for a twister. :) )
The horizontal twisters in The Wild Bunch and Amplifire both used a custom raytracer that only could render such an object (i.e. some cylinders and planes). |
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Oswald
Registered: Apr 2002
Posts: 5094 |
okay, in some cases it is a good idea indeed :) but I'd guess most coder's cant just slap together a raytracer even this simple in 5-10 minutes, it needs some perequisites like in the case of using a tool. :) |
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Pantaloon
Registered: Aug 2003
Posts: 124 |
a simple twist tracer in kickasm script, stores which side is visible for each line.
.for (var side = 0; side < 4; side++)
{
.var y0 = round(coords.get(side*2+0))
.var y1 = round(coords.get(side*2+1))
.var ydiff = y1 - y0
.if (ydiff > 0)
{
.for (var y = y0; y < y1; y++)
.eval points.put(y,side)
}
}
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Mace
Registered: May 2002
Posts: 1799 |
@ Pantaloon: don't you forget declaring 'coords' as a List()? Or something... |
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