// Update is the regular engine callback.
func (cr *crtag) Update(input *vu.Input) {
if input.Resized {
cr.resize()
}
dt := input.Dt
for press, _ := range input.Down {
switch press {
case "W":
cr.scene.MoveView(0, 0, dt*-cr.run)
case "S":
cr.scene.MoveView(0, 0, dt*cr.run)
case "A":
cr.scene.PanView(vu.YAxis, dt*cr.spin)
case "D":
cr.scene.PanView(vu.YAxis, dt*-cr.spin)
case "B":
ball := cr.scene.AddPart()
ball.SetFacade("sphere", "gouraud").SetMaterial("sphere")
ball.SetBody(vu.Sphere(1), 1, 0.9)
ball.SetLocation(-2.5+rand.Float64(), 15, -1.5-rand.Float64())
case "Sp":
cr.bod.Push(-2.5, 0, -0.5)
}
}
}
// Create is the engine intialization callback. Create the physics objects.
func (cm *cmtag) Create(eng vu.Engine) {
cm.holdoff, _ = time.ParseDuration("1000ms")
cm.last = time.Now()
cm.scene = eng.AddScene(vu.VF)
cm.scene.SetPerspective(60, float64(800)/float64(600), 0.1, 50)
cm.scene.SetLightLocation(0, 5, 0)
cm.scene.SetLightColour(0.4, 0.7, 0.9)
cm.scene.SetViewLocation(0, 10, 25)
// add a base for the other physics bodies to rest on.
slab := cm.scene.AddPart()
slab.SetLocation(0, 1, 0)
slab.SetFacade("cube", "gouraud").SetMaterial("floor")
slab.SetScale(100, 50, 100)
slab.SetBody(vu.Box(50, 25, 50), 0, 0.4)
slab.SetLocation(0, -25, 0)
// create a fixed part.
box := cm.scene.AddPart()
box.SetLocation(0, 1, 0)
box.SetFacade("cube", "gouraud").SetMaterial("cube")
box.SetScale(5, 5, 5)
box.SetBody(vu.Box(2.5, 2.5, 2.5), 0, 0) // sized to match scaling.
// create a physics body that can be associated with a camera,
cm.bod = cm.scene.AddPart()
cm.bod.SetFacade("sphere", "gouraud").SetMaterial("sphere")
cm.bod.SetBody(vu.Sphere(1), 1, 0)
cm.bod.SetLocation(-6, 2, -2)
// set some constant state.
cm.eng.Enable(vu.BLEND, true)
cm.eng.Enable(vu.CULL, true)
cm.eng.Enable(vu.DEPTH, true)
cm.eng.Color(0.1, 0.1, 0.1, 1.0)
return
}
// getBall creates a visible sphere physics body.
func (cr *crtag) getBall(bod vu.Part) {
bod.SetFacade("sphere", "gouraud").SetMaterial("sphere")
bod.SetBody(vu.Sphere(1), 1, 0.5)
}