Logarithmic spiral

[Erik Heyninck]

I need to draw a logarithmic spiral that starts in black and ends in white.
(Logarithmic means that is is like a cut from a seashell, not half circles that grow bigger and bigger in radius.)

I am trying to figure this out myself -probably simple but I forgot- but I don't get any closer. Anyone an idea?

[Erik Heyninck]

I need to draw a logarithmic spiral that starts in black and ends in white.
(Logarithmic means that is is like a cut from a seashell, not half circles that grow bigger and bigger in radius.)

I am trying to figure this out myself -probably simple but I forgot- but I don't get any closer. Anyone an idea?

[jclements]

A year or so ago there was a topic or two on this. search for "spiral". Ross McIntosh participated in the discussion I believe ... perhaps Ivan L. too.

[jclements]

CorelDRAW can do Logr Spirals easily. I imported these into Xara via CMX format and attached the Xara file below.

If you need a different expansion factor or # of revolutions, just email me. No charge : )

You could then use these as paths for a blend of a dark object to a light object OR apply a brush to them.

[jclements]

The Xara file

[gwpriester]

Erik

In the December 2001 Tutorial I showed a technique for creating a non-concentric spiral using a profiled blend of two circles.

This is similar to Ivan's method posted below except I used quarter sections of each circle.

Gary

Gary Priester

Moderator Person

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XaraXone

[This message was edited by Gary W. Priester on January 11, 2002 at 15:23.]

[ivan louette]

-1 set your window menu to show grid and snap to grid;
-2 create a circle, convert it to shapes, break at left and right points;
-3 delete an half (for example here the below one);
-4 snap one of the extremities to a point on the grid (easier if the line width is on zero points);
-5 take the opposite angle resize handle and resize the object to snap the opposite extremity to another point on the grid;
-6 use the set origin position button and set the origin (here on below middle);
-7 clone your object, flip it vertically;
-8 resize it like at step 5 up to snap to the next unit point of the grid;
-9 repeat this operation...

If you repeat always the latest shape the rotation center keeps the same position.

You could do the same with any other shape and not only half circles.

Kind regards,
ivan

Try all solutions, re-invent the Rose

[Erik Heyninck]

Thanks for all your methods and tricks.

I'll try them all out (as far as possible) and I'll try to explain what I mean. This spiral is made inside the rectangle of whirling squares and is based on Phi (Ancient Grecian design)

If you don't work against time, time often works for you.

[gwpriester]

Erik

In art school we learned about the golden triangle, which is what I believe you are referring to.

I just did a quick search on Google and found this link onGolden Triangle Spirals

This is another site Golden Ratio that should help.

See if this is what you have in mind.

Gary

Gary Priester

Moderator Person

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XaraXone

[jens g.r. benthien]

Erik,

aren't you using C4D? Create a new object with the spline tools -> spiral, modify the options until they match your needs (it'l even accept a formula), select the 2D window (meaning activate it) and export your spiral as an *.ai file.

Life can be so simple ;-}

jens

jens g.r. benthien
designer
http://jens.highspeedweb.net
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