## reb Class REB_TrapShapeThreeply

```Object
common:Generic
common:TrapShape
reb:REB_TrapShapeThreeply
```

`class TrapShape:REB_TrapShapeThreeply`

This shape is the Threeply strange attractor.

Ultra Fractal Source
``` class REB_TrapShapeThreeply(common.ulb:TrapShape) {
; This shape is the Threeply strange attractor.
public:
import "common.ulb"

; Constructor
func REB_TrapShapeThreeply(Generic pparent)
TrapShape.TrapShape(pparent)
endfunc

; Call this for each iteration being trapped.
float func Iterate(complex pz)
TrapShape.Iterate(pz)
int sgn = 1
if @sgn
sgn = -1
endif
float x = real(pz)*@s
float y = imag(pz)*@s
float pxx = 0
int att_iter = 0

while att_iter < @max_att_iterations
pxx = x
if x != 0
x = y - x/abs(x)*(abs(sin(x)*cos(@h2) + @h3 \
- x*sin(@h1 + @h2 + @h3)))
else
x = y - (abs(sin(x)*cos(@h2) + @h3 \
- x*sin(@h1 + @h2 + @h3)))
endif
y = @h1 - pxx
att_iter = att_iter + 1
endwhile
m_LastZ = (x + sgn*flip(y))
float d = @distscale*|pz-(x + sgn*flip(y))|
return d
endfunc

default:
title = "Threeply"
int param v_trapshapethreeply
caption = "Version (Trap Shape Threeply)"
default = 101
hint = "This version parameter is used to detect when a change has been made to the formula that is incompatible with the previous version. When that happens, this field will reflect the old version number to alert you to the fact that an alternate rendering is being used."
visible = @v_trapshapethreeply < 101
endparam

float param h1
caption = "Threeply param 1"
default = -55
endparam
float param h2
caption = "Threeply param 2"
default = -1
endparam
float param h3
caption = "Threeply param 3"
default = 0.8
endparam
float param distscale
caption = "Distance scale"
default = 0.0003
endparam
float param s
caption = "Attractor scale"
default = 50
endparam
int param max_att_iterations
caption = "Attractor iterations"
default = 10
endparam
bool param sgn
caption = "Conjugate transform"
default = false
endparam
}
```

Constructor Summary
`REB_TrapShapeThreeply()`

`REB_TrapShapeThreeply(Generic pparent)`
Constructor

Method Summary
` float` `Iterate(complex pz)`
Call this for each iteration being trapped.

Methods inherited from class common:TrapShape
`GetColorChannel, GetTextureValue, GetTransformedPoint, Init, IterateSilent, SetThreshold`

Methods inherited from class common:Generic
`GetParent`

Methods inherited from class Object

Constructor Detail

### REB_TrapShapeThreeply

`public REB_TrapShapeThreeply(Generic pparent)`
Constructor

### REB_TrapShapeThreeply

`public REB_TrapShapeThreeply()`
Method Detail

### Iterate

`public float Iterate(complex pz)`
Call this for each iteration being trapped.

Overrides:
`Iterate` in class `TrapShape`