I ran some numbers today comparing Carl's (wwwmwww) model to my own in terms of scale. I was pretty shocked at how close they are! I used the wheel size as a reference and came up with a conversion factor to make the models the same size. Carl's wheel (front and rear are the same diameter) has a radius of 85 POV-units. My wheel is 25 of my grid units. So, 25/85 = 0.2941 becomes the scale factor to convert from Carl's POV model to my model.

I did find that both of our axles were exactly 1/5 the diameter of the wheel. The main place where there was a slight difference was in the wheel base and canopy cylinder size. My canopy cylinder radius is 421.6 POV units and Carl's is 389.721 POV units which is a difference of 31.879 POV units. That's not a lot, but enough to make the lightcycle slightly longer. These numbers don't mean much without being translated into something visual, so the difference can be seen in these images:

Parallel projection, no perspective. My cylinder is blue, Carl's is white with 50% fade so the difference can be seen. The center point is referenced from the rear wheel, thus both rear wheels are in the same place.

Perspective projection of overall size difference.

So, my lightcycle is slightly longer, and Carl's is slightly shorter thus having more curvature in the canopy. Now we need to determine which model is more accurate...

As much as I'd hate to modify my model yet again, I think Carl's may be more correct. I used the side-view of the blue lightcycle as a reference, and it is rendered with projection (as all MAGI models are.) My model will sit over that blue image perfectly, which may be my error which Carl pointed out to me previously with the placement of the rear wheel and the wheel-well. The perspective makes the rear wheel look as if its center point is slightly further back from the rear chassis. When in fact the rear wheel's center is in line with the rear of the chassis, and the wheel-well does not intersect the rear wheel. The MAGI perspective renderings would have you think otherwise.

But before I give up and start modifying my radii, is there any way we can determine how much error the perspective projection of the MAGI model introduces?

Matthew

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