// 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 (ps *ParticleSystem) loadParticle(p *Particle) {
//set color
p.geometry.SetColor(p.Color)
//set flipbook uv
BoxFlipbook(p.geometry, p.Frame, ps.Settings.FramesX, ps.Settings.FramesY)
//rotate and move
particleTransform := util.Mat4From(p.Scale, p.Translation, p.Orientation)
//add geometry to particle system
p.geometry.Optimize(ps.geometry, particleTransform)
}
func (node *Node) SetRotation(angle float32, axis mgl32.Vec3) {
node.Orientation = mgl32.QuatRotate(angle, axis)
node.Transform = util.Mat4From(node.Scale, node.Translation, node.Orientation)
}
func (node *Node) SetOrientation(orientation mgl32.Quat) {
node.Orientation = orientation
node.Transform = util.Mat4From(node.Scale, node.Translation, node.Orientation)
}
func (node *Node) SetTranslation(translation mgl32.Vec3) {
node.Translation = translation
node.Transform = util.Mat4From(node.Scale, node.Translation, node.Orientation)
}
func (node *Node) SetScale(scale mgl32.Vec3) {
node.Scale = scale
node.Transform = util.Mat4From(node.Scale, node.Translation, node.Orientation)
}