Extrusions

Shape Extrusions. More...

Collaboration diagram for Extrusions:

Files
file	transform.scad
	Shape transformation functions.

Functions
module	st_rotate_extrude (r, pa=0, ra=360, profile=false)
	Revolve the 2D shape about the z-axis. More...
module	st_rotate_extrude_elongate (r, l, pa=0, ra=360, m=255, profile=false)
	Revolve the 2D shape about the z-axis with linear elongation. More...
module	st_linear_extrude_scale (h, center=false)
	Linearly extrude 2D shape with extrusion upper and lower scaling. More...

Detailed Description

Shape Extrusions.

Function Documentation

module st_linear_extrude_scale	(	h	,
		center	= false
	)

Linearly extrude 2D shape with extrusion upper and lower scaling.

Parameters

h	<vector|decimal> A vector of decimals or a single decimal to specify simple extrusion height.
center	<boolean> Center extrusion about origin.

When h is a decimal, the shape is extruded linearly as normal. To scale the upper and lower slices of the extrusion, h must be assigned a vector with a minimum of three decimal values as described in the following table.

sym	h[n]	default	description
h	0		total extrusion height
n1	1		(+z) number of scaled extrusion slices
h1	2		(+z) extrusion scale percentage
x1	3	-h1	(+z) x-dimension scale percentage
y1	4	x1	(+z) y-dimension scale percentage
n2	5	n1	(-z) number of scaled extrusion slices
h2	6	h1	(-z) extrusion scale percentage
x2	7	x1	(-z) x-dimension scale percentage
y2	8	y1	(-z) y-dimension scale percentage

Example

st_linear_extrude_scale

      st_linear_extrude_scale( [5,10,15,-5], center=true ) square( [20,15], center=true );

Note

When symmetrical scaling is desired, shape must be centered about origin.

Definition at line 230 of file transform.scad.

module st_rotate_extrude	(	r	,
		pa	= 0,
		ra	= 360,
		profile	= false
	)

Revolve the 2D shape about the z-axis.

Parameters

r	<decimal> The rotation radius.
pa	<decimal> The profile pitch angle in degrees.
ra	<decimal> The rotation sweep angle in degrees.
profile	<boolean> Show profile only (do not extrude).

Example

st_rotate_extrude

      st_rotate_extrude( r=50, pa=45, ra=270 ) square( [10,5], center=true );

Definition at line 103 of file transform.scad.

module st_rotate_extrude_elongate	(	r	,
		l	,
		pa	= 0,
		ra	= 360,
		m	= 255,
		profile	= false
	)

Revolve the 2D shape about the z-axis with linear elongation.

Parameters

r	<decimal> The rotation radius.
l	<vector|decimal> The elongation length. A vector [x, y] of decimals or a single decimal for (x=y)
pa	<decimal> The profile pitch angle in degrees.
ra	<decimal> The rotation sweep angle in degrees.
m	<integer> The section render mode. An 8-bit encoded integer that indicates the revolution sections to render. Bit values 1 enables the corresponding section and bit values 0 are disabled. Sections are assigned to the bit position in counter-clockwise order.
profile	<boolean> Show profile only (do not extrude).

Example

st_rotate_extrude_elongate

      st_rotate_extrude_elongate( r=25, l=[5, 50], pa=45, m=31 ) square( [10,5], center=true );

Note

When elongating (l > 0), ra is ignored. However, m may be used to control which complete revolution section to render.

Definition at line 139 of file transform.scad.