###### Descriptions and Examples for the POV-Ray Raytracerby Friedrich A. Lohmüller     POV-Ray Examples - How To Make Objects for POV-Ray
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Home
- POV-Ray Tutorial

- POV-Ray Examples
Index of Content
- Geometry
- Pawn
- Wireframe Cube
- Octagon
- Egg Shape
- Star
- Optical Lens
- Chessboard
- Regular Tetrahedron
- Penrose Triangle
- Yin & Yang
- Fishblob
- Threefold
- Trefoil
- Architecture
- Engineering

# Octagon - Octagonal Prism

###### The Construction of an Octagon (a nut or an octagonal column) Example for the using of the "intersection"-statement. Objects:   "box", "cylinder". Methods: "intersection", "inverse" Click here for an example!

The construction:

The common parts (= intersection) of a shape with quadratic shape and the same shape rotated by 45 degrees forms a shape with an octagonal outline.

###### View from top (view against y-direction)

The text:

```//==================== Octagon ===============
intersection{
box {<-1, 0.0,-1>,< 1,1.0,1> rotate<0, 0,0>}
box {<-1,-0.1,-1>,< 1,1.1,1> rotate<0,45,0>}
scale <1,0.5,1>
texture{Polished_Brass
normal{bumps 0.3 scale 0.02}
finish{diffuse 0.9 phong 1}
}
translate<1.1,0.00,0>}
//============================================

//================= Octagon hollow ===========
intersection{
box {<-1, 0.0,-1>,< 1,1.0,1> rotate<0, 0,0>}
box {<-1,-0.1,-1>,< 1,1.1,1> rotate<0,45,0>}
cylinder{<0,-0.1,0>,<0,1.1,0>,0.5 inverse
scale <1,0.5,1>
texture{Polished_Chrome
normal{bumps 0.3 scale 0.2}
finish{diffuse 0.9 phong 1}
}
translate<-1.1,0.50,0.5>}
//---------------------------------------- end```
We'll get the following images:
##### Scene description for POV-Ray:"povoct1.txt" or "povoct1.pov"
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 © Friedrich A. Lohmüller, 2009 http://www.f-lohmueller.de