func fire() {
var mass m.Real = 1.5
var radius m.Real = 0.2
// create a test sphere to render
bullet := CreateSphere(float32(radius), 16, 16)
bullet.Shader = colorShader
bullet.Color = mgl.Vec4{0.2, 0.2, 1.0, 1.0}
// create the collision box for the the bullet
bulletCollider := cubez.NewCollisionSphere(nil, radius)
bulletCollider.Body.Position = m.Vector3{0.0, 1.5, 20.0}
var cubeInertia m.Matrix3
var coeff m.Real = 0.4 * mass * radius * radius
cubeInertia.SetInertiaTensorCoeffs(coeff, coeff, coeff, 0.0, 0.0, 0.0)
bulletCollider.GetBody().SetInertiaTensor(&cubeInertia)
bulletCollider.Body.SetMass(mass)
bulletCollider.Body.Velocity = m.Vector3{0.0, 0.0, -40.0}
bulletCollider.Body.Acceleration = m.Vector3{0.0, -2.5, 0.0}
bulletCollider.Body.CalculateDerivedData()
bulletCollider.CalculateDerivedData()
e := NewEntity(bullet, bulletCollider)
bullets = append(bullets, e)
}
