7384be2e72
I apologise for the poor state of this library. I hope to improve it significantly soon. Right now it exists to support example/gopher and the debug library. LGTM=nigeltao R=nigeltao, bryanturley CC=adg, davidday, golang-codereviews https://golang.org/cl/141440043
50 lines
963 B
Go
50 lines
963 B
Go
// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package f32
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import "fmt"
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type Vec3 [3]float32
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func (v *Vec3) Normalize() {
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sq := v.Dot(v)
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inv := 1 / Sqrt(sq)
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v[0] *= inv
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v[1] *= inv
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v[2] *= inv
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}
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func (v *Vec3) Sub(v0, v1 *Vec3) {
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v[0] = v0[0] - v1[0]
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v[1] = v0[1] - v1[1]
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v[2] = v0[2] - v1[2]
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}
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func (v *Vec3) Add(v0, v1 *Vec3) {
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v[0] = v0[0] + v1[0]
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v[1] = v0[1] + v1[1]
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v[2] = v0[2] + v1[2]
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}
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func (v *Vec3) Mul(v0, v1 *Vec3) {
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v[0] = v0[0] * v1[0]
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v[1] = v0[1] * v1[1]
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v[2] = v0[2] * v1[2]
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}
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func (v *Vec3) Cross(v0, v1 *Vec3) {
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v[0] = v0[1]*v1[2] - v0[2]*v1[1]
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v[1] = v0[2]*v1[0] - v0[0]*v1[2]
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v[2] = v0[0]*v1[1] - v0[1]*v1[0]
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}
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func (v *Vec3) Dot(v1 *Vec3) float32 {
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return v[0]*v1[0] + v[1]*v1[1] + v[2]*v1[2]
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}
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func (v *Vec3) String() string {
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return fmt.Sprintf("Vec3[% 0.3f, % 0.3f, % 0.3f]", v[0], v[1], v[2])
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}
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