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High!
Advancing with MyMaglev... but just as I approached the completion of
the demonstration track constant-speed animation, a strange effect
appeared: from one frame to the next, the grey sky sphere suddenly
showed a kind of banding, also the perspective of the rails changed
significantly, which both never occurred before - but I didn't change
neither the y position of the camera nor the y direction of the look_at
vector!
The problem occurred at the "border" between two rail segments: a
straight 15-metre section running in NW direction (315°) and a following
45° right turn with a radius of 15 metres.
So what is the difference between:
// frame 2270
#declare loc=<4.3933982822, 0.2, -44.8223306237>+15*<sin(radians(45)),
0, cos(radians(45))>+<-0.1646497652-(clock-2196)*0.2, 0,
0.1646497652+(clock-2196)*0.2>*1/(sqrt(2));
#declare ldir=vrotate(<0, 0, 1>, y*315);
and
// frame 2271
#declare loc = <4.3933982822, 0.2, -44.8223306237>+15*<sin(radians(45)),
0, cos(radians(45))>+<-15, 0, 15>*1/(sqrt(2))+15*<sin(radians(45)), 0,
cos(radians(45))>+15*<sin(radians(225.6289157763+(clock-2271)*0.763943726)),
0, cos(radians(225.6289157763+(clock-2271)*0.763943726))>;
#declare ldir = vrotate(<0, 0, 1>,
y*(315.6289157763+(clock-2271)*0.763943726));
?
See you in Khyberspace!
Yadgar
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Attachments:
Download 'cabinrailway2270.png' (23 KB)
Download 'cabinrailway2271.png' (25 KB)
Preview of image 'cabinrailway2270.png'
Preview of image 'cabinrailway2271.png'
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Jörg 'Yadgar' Bleimann wrote:
> Advancing with MyMaglev... but just as I approached the completion of
> the demonstration track constant-speed animation, a strange effect
> appeared: from one frame to the next, the grey sky sphere suddenly
> showed a kind of banding, also the perspective of the rails changed
> significantly, which both never occurred before - but I didn't change
> neither the y position of the camera nor the y direction of the look_at
> vector!
I found the reason for the change in the view: I left out "angle 40" in
the #range(2271, 2329) section - erroneously thinking that 40° was the
default FOV with PoV-Ray 3.6!
See you in Khyberspace!
Yadgar
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