Rotating Balls [Ben Beaumont]

[runrev260805 at m-r-d.de]

Richmond,

btw.: didn´t you want to wear your kilt at the conference?  I remember  a list posting someone wanted to do that. Until now i did not see anyone wearing one?
Or are you allways behind the camera?  ;-)

Regards,

Matthias

-------- Original Message --------
Subject: Rotating Balls [Ben Beaumont] (03-Sep-2009 10:45)
From:    Richmond Mathewson <richmondmathewson at gmail.com>
To:      runrev260805 at m-r-d.de

> Ben Beaumont gave a most stimulating talk last night about the jazzy new
> visual effectsin RR 4. At one point he showed us a simulation of a solar
> system featuring a sun and
> 4 or 5 planets in orbit about it. The particularly fancy bit was that the
> side of a planet
> facing towards the sun was always 'lit'. Ben Beaumont claimed that this
> effect was
> a bit difficult.
> 
> . . . I went back to my lodgings and jumped into a good, hot bath . . .
> 
> Bingo: all one has to do is set up a sequence of numbers round a circle 
> like
> this:
> 
> repeat with XYZ = 0 to 6.28 step 0.05
>   put (cos(XYZ) * 150) into KOZ
>   put (cos(XYZ - 1.54) * 150) into KOZ2
>   put (sine(XYZ) * 150) into SIGN
>   put (sine(XYZ - 1.54) * 150) into SIGN2
> 
> 
> then one sets up a circular graphic of, say, 300,300 with a linear
> fillGradient of black
> to green/blue/red and sets the following:
> 
>   set the fillGradient["to"] to (KOZ + 400),(SIGN + 400)
>   set the fillGradient["from"] to (KOZ2 + 400),(SIGN2 + 400)
> end repeat
> 
> [ mind you, this might be complete rubbish as I haven't tried it yet . . .]
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