// Draw draws this to the target region.
func (m *Model) Draw(r Region, delta float64) {
if m.isNew || m.isDirty() || forceDirty {
m.isNew = false
data := m.data[:0]
for _, v := range m.verts {
vec := mgl32.Vec3{v.X - 0.5, v.Y - 0.5, v.Z - 0.5}
vec = m.mat.Mul4x1(vec.Vec4(1)).Vec3().
Add(mgl32.Vec3{0.5, 0.5, 0.5})
vX, vY, vZ := vec[0], 1.0-vec[1], vec[2]
dx := r.X + r.W*float64(vX)
dy := r.Y + r.H*float64(vY)
dx /= scaledWidth
dy /= scaledHeight
data = appendShort(data, int16(math.Floor((dx*float64(lastWidth))+0.5)))
data = appendShort(data, int16(math.Floor((dy*float64(lastHeight))+0.5)))
data = appendShort(data, 256*int16(m.Layer())+int16(256*vZ))
data = appendShort(data, 0)
data = appendUnsignedShort(data, v.TX)
data = appendUnsignedShort(data, v.TY)
data = appendUnsignedShort(data, v.TW)
data = appendUnsignedShort(data, v.TH)
data = appendShort(data, v.TOffsetX)
data = appendShort(data, v.TOffsetY)
data = appendShort(data, v.TAtlas)
data = appendShort(data, 0)
data = appendUnsignedByte(data, v.R)
data = appendUnsignedByte(data, v.G)
data = appendUnsignedByte(data, v.B)
data = appendUnsignedByte(data, v.A)
}
m.data = data
}
render.UIAddBytes(m.data)
}