86 lines
1.5 KiB
Go
86 lines
1.5 KiB
Go
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package vec3
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import (
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"zworld/plugin/math"
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"zworld/plugin/math/random"
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"zworld/plugin/math/vec2"
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)
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// New returns a Vec3 from its components
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func New(x, y, z float32) T {
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return T{x, y, z}
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}
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func New1(v float32) T {
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return T{v, v, v}
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}
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// NewI returns a Vec3 from integer components
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func NewI(x, y, z int) T {
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return T{float32(x), float32(y), float32(z)}
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}
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func NewI1(v int) T {
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return T{float32(v), float32(v), float32(v)}
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}
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func FromSlice(v []float32) T {
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if len(v) < 3 {
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panic("slice must have at least 3 components")
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}
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return T{v[0], v[1], v[2]}
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}
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// Extend a vec2 to a vec3 by adding a Z component
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func Extend(v vec2.T, z float32) T {
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return T{v.X, v.Y, z}
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}
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// Dot returns the dot product of two vectors.
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func Dot(a, b T) float32 {
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return a.X*b.X + a.Y*b.Y + a.Z*b.Z
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}
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// Cross returns the cross product of two vectors.
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func Cross(a, b T) T {
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return T{
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a.Y*b.Z - a.Z*b.Y,
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a.Z*b.X - a.X*b.Z,
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a.X*b.Y - a.Y*b.X,
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}
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}
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// Distance returns the euclidian distance between two points.
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func Distance(a, b T) float32 {
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return a.Sub(b).Length()
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}
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func Mid(a, b T) T {
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return a.Add(b).Scaled(0.5)
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}
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// Random vector, not normalized.
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func Random(min, max T) T {
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return T{
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random.Range(min.X, max.X),
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random.Range(min.Y, max.Y),
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random.Range(min.Z, max.Z),
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}
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}
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func Min(a, b T) T {
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return T{
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X: math.Min(a.X, b.X),
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Y: math.Min(a.Y, b.Y),
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Z: math.Min(a.Z, b.Z),
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}
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}
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func Max(a, b T) T {
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return T{
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X: math.Max(a.X, b.X),
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Y: math.Max(a.Y, b.Y),
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Z: math.Max(a.Z, b.Z),
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}
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}
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