func safeNormalize(v mgl32.Vec3) mgl32.Vec3 {
v = v.Normalize()
if math.IsInf(float64(v[0]), 0) || math.IsNaN(float64(v[0])) {
return mgl32.Vec3{}
}
return v
}
// CreateBeam - creates a square prism oriented along the vector
func CreateBeam(width float32, vector mgl32.Vec3) *Geometry {
direction := vector.Normalize()
geo := CreateBoxWithOffset(width, width, -width*0.5, -width*0.5)
geo2 := CreateBoxWithOffset(width, width, -width*0.5, -width*0.5)
facingTx := util.Mat4From(mgl32.Vec3{1, 1, 1}, mgl32.Vec3{}, util.FacingOrientation(0, direction, mgl32.Vec3{0, 0, 1}, mgl32.Vec3{1, 0, 0}))
geo.Transform(facingTx)
facingTx = util.Mat4From(mgl32.Vec3{1, 1, 1}, vector, util.FacingOrientation(0, direction, mgl32.Vec3{0, 0, -1}, mgl32.Vec3{1, 0, 0}))
geo2.Optimize(geo, facingTx)
geo.Indicies = append(geo.Indicies, 0, 1, 4, 4, 5, 0) //top
geo.Indicies = append(geo.Indicies, 1, 2, 7, 7, 4, 1) //side
geo.Indicies = append(geo.Indicies, 2, 3, 6, 6, 7, 2) //bottom
geo.Indicies = append(geo.Indicies, 3, 0, 5, 5, 6, 3) //side
return geo
}
func (c *Camera) Update(dt float32) {
/* Handle keyboard input */
move := false
dir := mgl.Vec3{}
if KeyDown(KeyW) && !KeyDown(KeyS) {
dir[2] += 1
move = true
}
if KeyDown(KeyS) && !KeyDown(KeyW) {
dir[2] -= 1
move = true
}
if KeyDown(KeyA) && !KeyDown(KeyD) {
dir[0] -= 1
move = true
}
if KeyDown(KeyD) && !KeyDown(KeyA) {
dir[0] += 1
move = true
}
if KeyDown(KeyE) && !KeyDown(KeyQ) {
dir[1] += 1
move = true
}
if KeyDown(KeyQ) && !KeyDown(KeyE) {
dir[1] -= 1
move = true
}
if move {
/* Calculate normalized movement vector */
dv := 5.0 * dt /* magic number: movement speed */
dir = dir.Normalize().Mul(dv)
right := c.Transform.Right.Mul(dir[0])
up := mgl.Vec3{0, dir[1], 0}
forward := c.Transform.Forward.Mul(dir[2])
/* Translate camera */
c.Transform.Translate(right.Add(up.Add(forward)))
}
/* Mouse look */
if MouseDown(MouseButton1) {
rx := c.Transform.Rotation[0] - Mouse.DY*0.08
ry := c.Transform.Rotation[1] - Mouse.DX*0.09
/* Camera angle limits */
/* -90 < rx < 90 */
rx = float32(math.Max(-90.0, math.Min(90.0, float64(rx))))
/* -180 < ry < 180 */
if ry > 180.0 {
ry -= 360.0
}
if ry < -180.0 {
ry += 360.0
}
c.Transform.Rotation[0] = rx
c.Transform.Rotation[1] = ry
}
/* Update transform with new position & rotation */
c.Transform.Update(dt)
/* Calculate new view matrix based on forward vector */
lookAt := c.Transform.Position.Add(c.Transform.Forward)
c.View = mgl.LookAtV(c.Transform.Position, lookAt, mgl.Vec3{0, 1, 0})
}