g3

package module

v0.0.0-...-e1ba7b7 Latest Latest Go to latest Published: Nov 22, 2012 License: MIT Imports: 1 Imported by: 6

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Valid go.mod file
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Repository

github.com/krasin/g3

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Open Source Insights

README ¶

g3: 3d geometry in Go

This package defines primitives like Point, Vector, Triangle (float64-based), as well as integer Node. It also has a basic support of a uniform Grid.

The immediate purpose of this library is to be a base for github.com/krasin/voxel. Theoretically, it also might be useful for other uses.

Documentation ¶

Index ¶

Variables
type Grid
type Node
type Point
- func (p Point) Sub(p2 Point) Point
type ScalarField
type Triangle
type Vector
- func (vec Vector) L2() float64
- func (vec Vector) Normalize() Vector

Constants ¶

This section is empty.

Variables ¶

View Source

var AdjNodes26 = adjNodes26()

AdjNodes26 is the list of all 26 adjacent nodes of ZeroNode.

View Source

var AdjNodes6 = []Node{
	{0, 0, -1},
	{0, 0, 1},
	{0, -1, 0},
	{0, 1, 0},
	{-1, 0, 0},
	{1, 0, 0},
}

View Source

var ZeroNode = Node{0, 0, 0}

Functions ¶

This section is empty.

Types ¶

type Grid ¶

type Grid struct {
	P0 Point
	H  float64
	N  int
}

Grid is a uniform grid NxNxN with step H in the cube with smallest point P0.

func (Grid) At ¶

func (g Grid) At(node Node) Point

func (Grid) Node ¶

func (g Grid) Node(p Point) Node

func (Grid) Side ¶

func (g Grid) Side() float64

type Node ¶

type Node [3]int

Node is a point in 3d space with integer coordinates. It also might be a node in a Grid.

func (Node) Add ¶

func (node Node) Add(another Node) Node

Add returns a sum of node and another node.

func (Node) IsZero ¶

func (node Node) IsZero() bool

IsZero returns if node is { 0, 0, 0 }

func (Node) Point ¶

func (node Node) Point() Point

Point converts Node to Point.

func (Node) Sub ¶

func (node Node) Sub(another Node) Node

Sub returns a difference between node and another node.

func (Node) Vector ¶

func (node Node) Vector() Vector

Vector converts Node to Vector.

type Point ¶

type Point [3]float64

Point is a point in 3d space.

func (Point) Sub ¶

func (p Point) Sub(p2 Point) Point

type ScalarField ¶

type ScalarField func(p Point) float64

ScalarField is a function that returns a value for every given point in 3d space.

type Triangle ¶

type Triangle [3]Point

Triangle is a triangle in 3d space with a normal defined by the order of vertices. See http://www.opengl.org/wiki/Calculating_a_Surface_Normal

type Vector ¶

type Vector [3]float64

Vector is a vector in 3d space.

func (Vector) L2 ¶

func (vec Vector) L2() float64

L2 calculates L2 norm of vector (aka length)

func (Vector) Normalize ¶

func (vec Vector) Normalize() Vector

Normalize returns a vector that points to the same direction but has L2 norm equals to 1. It will panic on Zero vector and will be out of precision for small vectors.

Source Files ¶

View all Source files

primitive.go

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