func Init(fern float64) { // called by points.Start ()
//
const (
D = 2.0 // -fache Bildschirmbreite
nah = C.GLdouble(0.2)
)
if !initialized {
initialize()
}
C.glMatrixMode(C.GL_PROJECTION)
C.glLoadIdentity()
deg := D * math.Atan((0.5/D)/scr.Proportion())
deg /= 0.9 // experimentelle Weitwinkelkorrektur
var m [4][4]C.GLdouble
m[1][1] = 1.0 / C.GLdouble(math.Tan(deg)) // Cot
m[0][0] = m[1][1] / C.GLdouble(scr.Proportion())
// delta:= C.GLdouble(fern) - nah
// m[2][2] = - (C.GLdouble(fern) + nah) / delta
// m[2][3] = GLdouble(-1.0)
// m[3][2] = -2. * nah * C.GLdouble(fern) / delta
m[2][2] = C.GLdouble(-1.0)
m[2][3] = C.GLdouble(-1.0)
m[3][2] = C.GLdouble(-1.0) * nah
C.glMultMatrixd(&m[0][0])
// q:= C.GLdouble(0.75)
// GLFrustum (-1.0 * nah, 1.0 * nah, -q * nah, q * nah, 1.0 * nah, C.GLdouble(fern))
C.glMatrixMode(C.GL_MODELVIEW)
}
func Write0() {
//
if !initialized {
initialize()
}
if !scr.UnderX() {
ker.Stop(pack, 1)
}
C.glMatrixMode(C.GL_MODELVIEW)
C.glLoadIdentity()
for i := 0; i < 3; i++ {
matrix[i][0] = C.GLdouble(right[i])
matrix[i][1] = C.GLdouble(top[i])
matrix[i][2] = C.GLdouble(-front[i])
}
C.glMultMatrixd(&matrix[0][0])
C.glTranslated(C.GLdouble(-eye[0]), C.GLdouble(-eye[1]), C.GLdouble(-eye[2]))
C.glClear(C.GL_COLOR_BUFFER_BIT + C.GL_DEPTH_BUFFER_BIT)
for n := uint(0); n < MaxL; n++ {
if lightInitialized[n] {
ActualizeLight(n)
}
}
C.glBegin(POINTS)
nn = 0
}