By there way... there are clues hidden in frames that don't even have the spokes in them.


The circle formed but the intersection of the cutout and the outer edge of the front tire appears to be an ellipse from this angle (well very close to one anyways, perspective throws it off just a bit). Now if the sphere in the center, or axle, were sunk into a black material in the center such that you could see this intersection it too would line in a plane parallel to the one that contains the circle mentioned above. This intersection would also be a circle and this is true if the black hub is flat as in version 3 of my light cycle or if the black hub is a symmetric bowl shape.

Now ask yourself why the outline of the center sphere is perfectly circular. Remember the other circle in a parallel plane seen from this angle is an ellipse. It just tells me we don't see any such intersection and that tells me ALOT.

Carl

Now here is version 4 of my light cycle...

Compare the above pic to this one.


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I always took the "spoke" to be a reflection of the grid on the inside of the wheel.... not actually part of the lightcycle itself.

i wish we could attach swf files here the same way we do images

Boingo_Buzzard Wrote: I use deviantart.com to post swf files. Kamui also suggested sheezyart.com. Please post your swf files, I'd like to see them.

Ok... I'll ask, what are swf files?

Carl

Hi Carl!

Good work, looks 101% perfect.

I cant figure out, how big or stretched ect are the balls,
which are cutting in the wheel and how far away the hubs are.
Could you post a top-view wireframe, please?
That would say more then 1000 words

I was always wonderung about the hubs, which i cant seem to get right....now your findings explains it

Dirk

Cueball Wrote:Hi Carl!

Hello Dirk,

Cueball Wrote:Good work, looks 101% perfect.

Thanks. I too was very pleased with how well I could copy the shape. Something else I've known for sometime and I'm not 100% sure of all these terms so if there is someone out there familiar with cameras or virtual cameras please feel free to correct me. In POV-Ray there is a camera angle setting that determines the field of view from the camera. Somewhere in the POV-Ray documentation I remember reading that typical settings for this were something like 25 or 30 degrees. I guess this best mimics the number of degrees you monitor takes up of your eyeballs field of view so in extent the camera is your eyeball looking through the monitor. In Tron everytime I've tried to copy a frame as closely as I can I end up having to use a camera angle in the ballpark of 60 degrees so that gives the images much more perspective distortion. For comparison a 180 degree camera angle I believe gives you the fish eye lense effect. So if you want to copy the look of TRON as best you can I guess you should be using a camera angle of 60. Maybe you already are Dirk I can't tell but this is just an observation I've made that I thought might help others.

Cueball Wrote:I cant figure out, how big or stretched ect are the balls, which are cutting in the wheel and how far away the hubs are. Could you post a top-view wireframe, please? That would say more then 1000 words

Well I'm using a CSG so there is no wireframe.

However the front tire is a perfect sphere and both cut outs are also perfect spheres. There is no "stretching" going on there. Here is my new front tire...

#local o_radius = 56.74471;
#local o_z = 63.28536;
#local i_radius = 50.19678;
#local cutout_z = -6.123865;
#local cutout_radius = sqrt(o_radius*o_radius+cutout_z+cutout_z);
#local i_z = o_z-cutout_z-sqrt(cutout_radius*cutout_radius-i_radius*i_radius);
#local check1 = sqrt(85*85-i_z*i_z);
#local check2 = sqrt(2)*i_radius;
#write (MyFile,cutout_radius," ",i_z," ",check1," ",check2)

#local front_tire2 = difference {
sphere {, 85}
sphere {, cutout_radius}
sphere {, cutout_radius}
bounded_by {box {, }}
texture {
object {
box {, }
texture {pigment {bike_color} finish {ambient .1 diffuse .5 phong 1}}
texture {shiny_black}
}
}
}

This is the axle. (also all perfect speheres)

#local front_axle2 = union {
sphere {, 17}
sphere {, 17}

And this is the spoke.

#local front_hub2 = prism {linear_sweep linear_spline -36, 36, 4,
, , ,
rotate -x*90
rotate -z*front_spoke_angle
translate
texture {bright_white}
}

This should tell you the relative sizes of all the spheres. The parameter cutout_z is the one to change to vary the front wheel cutout without changing the apparent size of the hub from a side ortographic shot. In short it doesn't change the radius of the intersection of the cutout with the sphere that makes up the front tire and it also doesn't change the radius of the hub itself but it does move the hub in and out.

Cueball Wrote:I was always wonderung about the hubs, which i cant seem to get right....now your findings explains it Dirk

Had it not been for your pushing I wouldn't have found it. I think I've looked at every frame of film that has a light cycle in it 20 times now and I'm still having people point out things I've over looked. That's a good thing and just goes to prove 2 heads are better then o

Hi Carl!

Did a few versions yesterday and came pretty close, its just a bit to deep:


But its still a bit off, im gonna check your cycle tomorrow.
(Today is my daughter 1st birthday )

Im a bit lost of the pov-code, how big are the cutout-spheres and where are their center on the z-axis?

EDIT:I had lots of math during my electrician apprenticeship,
but thats soooooo long ago
I guess i can figure it out, the povray-docs are worth a look too.


If this picture is right, i need to change my rearwheel too.
(2 cones substracted, them a cylinder....that would make 57 on yours then????)


Dirk
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Great work, Carl. I never though about optimizing the cycle to the degree you are taking it. You really are a great modeller! It is a great pleasure just to read about your findings!

Martin

Hi!

Just finished the changes on the lightcycle,
i hope everything is correct now.
Im at 16771 Polygons now

Still have to change the shading on the windows.

Now back to the tank.....

Dirk


Wireframe: http://www.cueball.de/images/Tron/Lightcycle_wire02.jpg
And 2 bigger renders (1280*1024):

EDIT:Worked on the window-shading a bit.
Still not perfect, but closer to the real now.

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