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#1
10-16-2014, 06:09 PM
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Help with Panel Lines on a part
OK............ I know my old math teacher warned that one day math will save your life, so don't forget....................But ai DID! And it really ain't life threatening.......
I want a formula that will allow me to draw panel line on this part............ it's not not a true cone........ when assembles the side show the top as level and the bottom is angled towards the rear of the part I don't want to guess........ I want to be able to place a panel line that goes around the circumference at a specific location that will be level with the larger end so that I can use it for panel lines in multiple locations that will be equidistant from each another all the way around the part ............. what I've tried doesn't create a level panel line when looked at after assembly........... I hope that this is understandable........... and please don't tell my old math teacher I forgot........... I probably go DUH! when i'st posted, but right now it ain't happening with the ole noggin............ john 
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#2
10-16-2014, 06:18 PM
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I'd be interested in knowing the answer to this as well.
 Anyway, is cheating allowed? If I were to do that, I'd fire up my 3D app. Then I'd create that cone. Then I'd create a plane object and intersect it to the part of the cone where I'd like the panel line to be. But I would prefer that formula approach. Much more elegant.
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#3
10-16-2014, 06:36 PM
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Well since I do a lot of recolors with already unfolded parts a formula would be much more helpful, and I really don't want to recreate a part every time........ and I've also forgotten all the BLENDER I learned and am thinking about learning Metasequoia..........
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#4
10-16-2014, 07:04 PM
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John,
I'm going with shorter length is a percentage of the base (eg. If you are 12 pix from the left edge of the base, and the top is 25% of the length of the base, then you would put the other 12 pix X .25 = 3 pix from the left edge at the top). That's my guess. Gary
__________________
"Fast is fine, but accuracy is everything" - Wyatt Earp Design Group Alpha https://ecardmodels.com/vendors/design-group-alpha
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#5
10-16-2014, 07:16 PM
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I think I found the formula. It turns out that there's a mathematical term for the operation that you need to do -- Conic Sections.
Conic Section -- from Wolfram MathWorld
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#6
10-16-2014, 07:22 PM
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Quote:
By the way, I can tell it's a 777 model. What airline are you planning?
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#7
10-16-2014, 07:27 PM
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Chris........ tried that........ no joy
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#8
10-16-2014, 07:29 PM
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Quote:
I think what we are trying to find is the formula for determining the parabola formed when a plane intersects an oblique cone, parallel to the shortest edge of the cone (the shortest edge is what would be the top of the aircraft). No clue beyond that... Yet.
__________________
Glenn
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#9
10-16-2014, 07:36 PM
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Eric.......... I got lost.......but I'll keep looking at it
Gary.......???
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#10
10-16-2014, 07:46 PM
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I think Gary may have it fixing to check.................
create a arc with a height of 25% of the straight line length
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