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Recursive 2D fern leaf procedure

Submitted by Andy on Sat, 06/07/2013 - 20:15
Blog project image

In my previous blog, I explained about a recursive tree procedure. Here is another one borrowed from Joshua's Logo Interpreter example: fern leaf procedure. This fern leaf procedure creates a 2D fern leaf in VRMath2's 3D space. You can examine it below in the 3D space with the LOGO program.

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Recursive 2D tree

Submitted by Andy on Sat, 06/07/2013 - 16:12
Recursive 2D tree

One of the powerful abilities of LOGO programming language is its recursive execution of procedure. Recursive call of procedure means a procedure calls itself until an exiting condition is met. A recursive procedure can be very simple yet it can produce complex and beautiful mathematical graphics such as fractal images and naturally occurring objects. 

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My first 3D project: A simple table

Submitted by Andy on Tue, 18/06/2013 - 15:33
Simple table design

This table is consisted of 5 objects. The table top is a scaled box (cube). The four legs are scaled cans (cylinder).

To make this table, I carefully walked the turtle to the location where the objects should be placed and rotate the turtle to face certain direction before I place the objects. To move the turtle, I use the Quick Command Window to try first, and eventually I wrote in the Logo Editor Window the following commands to create this table.