Subject: Re: Simulating clouds
Date: Tue, 31 May 94 21:16:40 GMT
From: Andrew Nunn <apn@moby.demon.co.uk>

Hi Jeremy,

> > /      Hello evrywhere,
> > ||              I'm wondering if somebody has got good results
> > /      simulating clouds (3d or 2d) using Imagine 2.0 without
> >         Essence I/][
>=20
> No, but I have several good brushmaps that I made in Vista Pro by=20
> pointing the camera above the ground.

I tried this recently: Generate some fractal clouds in Vista. With
the landscape flat, position the camera at the very centre. Render
four pictures with the camera positioned in the four corners ensuring
that the pitch is set the same in each. Then use ADPro (or whatever) to
composite the pictures together side by side in the same rotational
order as they were rendered. The joins do show (just) but could be
ironed out with a suitable Superbitmap capable paint program.

Back in Imagine, create a hemisphere by adding a Primitive sphere and
deleting half the points (z<0).Apply the large brush as a cylinder wrap
(wrap Z) and set the Bright attribute. Position all your other objects,
lights etc inside the dome. The effect is especially good if the camera
moves because the the clouds also move around. The Bright setting ensures=

that no shadows get cast on the sky!

Andrew


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