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From: [e-mail] (Justin Barrett)
Subject: Re: Radial Fire Effect...
Date: Mon, 28 Aug 1995 15:16:00 GMT
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Organization: Ten Forward BBS in Port Angeles, WA 360.452.7681
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On 26 Aug 95, [e-mail] spoke up and said:

Da> On Fri, 25 Aug 1995, Adrian Onsen wrote:

Da> >       I heed to make a texture on a surface, which resembles fire.
Da> > That's not something I haven't done before, but the tricky part is
Da> that
Da> > this fire has to be on a disk, and it has to burn from the outside in.
Da> > Middle of the disk being black (or transpatrent) and the outside of
Da> the
Da> > disk is where the fire originates.
Da> >       Too bad LW doesn't have a radial fractal noise texture...
Da> >
Da> >       How can I accomplish this???? I still can't think of any way to
Da> > do this, since the effect is radial, not rectangular...

Da> Model a cone, set the surface name and save it....then move the top
Da> point of the cone down so that it's level with the bottom of the cone (a
Da> flat disk) and then go to the Polygon panel and Remove all polygons and
Da> save this object.  Map your fire texture (or image map) onto the cone's
Da> surface and do a 100% morph to the flattened cone (disk) shape.

Better yet, forget morphing all together.  Model a cone, like you said.  I
find a tall thin cone works great.  Just load it into Layout, surface it
like you want, and scale it to 0 on the Y axis, and about 5 on X and Z.
This will take your original cone and make it flat and fat, and the texture
map will be squashed accordingly.  If you're using Fractal noise with a Y
velocity, the tall thin cone squashed & stretched will make the vertical
texture movement more noticible.  Plus, for transparency, set the texture
center at the bottom of the cone, with an appropriate Y falloff so it's
100% transparent at the top.  When you've squashed & stretched the cone,
the resulting disc will be visible on the edges and transparent in the
center.

I've been trying this effect as I've been typing, and it works quite well!
Some experimentation will be necessary to find the best texture sizes, as
well as the size of cone.

Here's a variation to get fire moving in a spiral, using morphing this
time.  Model the first cone with a number of vertical segments.  Cut off
the bottom polygon, Triple all the rest, and save it as Cone1.  Use the
Twist tool to twist the cone a bit, kill the polygons, scale it to 0 on the
Y axis, and save it as Cone2.

In Layout, give it the same texture as you did before (for the squash &
stretch trick).  Morph Cone1 into Cone2 100%.  You should have a ring of
fire spiraling into the center!

         Justin Barrett - [e-mail] - 1:350/401
    Free Spirit Productions   -   Northland Cable   -   Peninsula College

 * Q-Blue 2.1 *
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