Subject: RE: Solar corona and anti-aliasing
Date: Fri, 6 May 1994 16:30:07 -0500 (CDT)
From: kirvan@SSESCO.com

Greetings,

The discussion about how to do a solor corona got me curious so I quickly
threw this together.  This is a pretty good example of Imagine 3.0's (cool)
new fog textures.  Move the texture axes and rotate the outer object to get
them to animate.


Red Giant with Corona (from the kitchen of Scott Kirvan)
============
Primative Sphere:   Size: (50, 50, 50)
Attributes:         Bright
Texture:            Fireball
        Size:       (86, 86, 86)
        Parameters:   0.0         0.0
                    255.0         0.0
                    255.0         0.0
                    100.0         0.0
                    200.0         0.0
                     30.0         0.0
                      0.0         0.0
                      0.4         0.0

Primative Sphere:   Size: (75, 75, 75)
Attributes:         Color: (255, 85, 0)
                    Fog Length = 0.01
Texture:            Nebula  (Fog Texture)
        Size:       (4.5, 4.5, 4.5)
        Parameters:   325.0       0.0
                      1.0         0.0
                      0.0         0.0
                      5.0         0.0
                      0.2         0.0
                      1.0       255.0
                      1.0       255.0
                      0.0       100.0

Texture:            Ghost  (Fog Texture)
        Parameters: 1200.0        0.0
                      1.0         0.0
                      0.0         0.0
                      0.0         0.0
                      0.0         0.0
                      0.0         0.0
                      0.0         0.0
                      0.0         0.0

Add one bottle of SPF 62 Sunblock and bake, bake, bake!

later.........sk.....

PS. Here's some notes about the new anti aliasing in V3.0:
Setting the number of rays per pixel parameter to 255 does not shoot 255
rays at every pixel.  Extra rays will only be shot when the the threshold
level is exceeded from one ray to another.  Lowering the threshold will
improve the anti-aliasing, but will increase rendering times.  If you keep
the contrast low in your pictures, the new anti-aliasing won't be so slow.
Using textures with small details and high contrast increases the
anti-aliasing time, but beyond that textures shouldn't increase the anti-
aliasing times.




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