// newCube's are often started with 1 corner, 2 edges, or 4 bottom side pieces.
func newCube(eng vu.Engine, part vu.Part, x, y, z, cubeSize float64) *cube {
c := &cube{}
// c.eng = eng
c.part = part.AddPart()
c.cells = []vu.Part{}
c.cx, c.cy, c.cz, c.csize = x, y, z, cubeSize
c.ccnt, c.cmax = 0, 8
c.mergec = func() { c.merge() }
c.trashc = func() { c.trash() }
c.addc = func() { c.addCell() }
c.remc = func() { c.removeCell() }
// calculate the cell center locations (unsorted)
qs := c.csize * 0.25
c.centers = csort{
&lin.V3{x - qs, y - qs, z - qs},
&lin.V3{x - qs, y - qs, z + qs},
&lin.V3{x - qs, y + qs, z - qs},
&lin.V3{x - qs, y + qs, z + qs},
&lin.V3{x + qs, y - qs, z - qs},
&lin.V3{x + qs, y - qs, z + qs},
&lin.V3{x + qs, y + qs, z - qs},
&lin.V3{x + qs, y + qs, z + qs},
}
return c
}
// newPanel creates a panel with no cubes. The cubes are added later using
// panel.addCube().
func newPanel(eng vu.Engine, part vu.Part, x, y, z float64, level int) *panel {
p := &panel{}
p.eng = eng
p.part = part.AddPart()
p.lvl = level
p.cubes = []*cube{}
p.cx, p.cy, p.cz = x, y, z
p.ccnt, p.cmax = 0, (level-1)*(level-1)*8
p.mergec = func() { p.merge() }
p.trashc = func() { p.trash() }
p.addc = func() { p.addCell() }
p.remc = func() { p.removeCell() }
return p
}
// getBox creates a visible box physics body.
func (cr *crtag) getBox(bod vu.Part) {
bod.SetScale(2, 2, 2)
bod.SetFacade("cube", "gouraud").SetMaterial("sphere")
bod.SetBody(vu.Box(1, 1, 1), 1, 0)
}
// 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)
}