protected function _raytrace()
{
// Create basic ray ... modify direction later
$ray = new Image_3D_Line($this->_camera->getX(), $this->_camera->getY(), $this->_camera->getZ(), new Image_3D_Vector(0, 0, 1));
// Colorarray for resulting image
$canvas = array();
// Iterate over viewplane
for ($x = -$this->_size[0]; $x < $this->_size[0]; ++$x) {
for ($y = -$this->_size[1]; $y < $this->_size[1]; ++$y) {
$canvas[$x + $this->_size[0]][$y + $this->_size[1]] = array();
// Iterate over rays for one pixel
$inPixelRayDiff = 1 / ($this->_rays + 1);
for ($i = 0; $i < $this->_rays; ++$i) {
for ($j = 0; $j < $this->_rays; ++$j) {
// Modify ray
$ray->setDirection(new Image_3D_Vector($x + $i * $inPixelRayDiff - $this->_camera->getX(), $y + $j * $inPixelRayDiff - $this->_camera->getY(), -$this->_camera->getZ()));
// Get color for ray
$color = $this->_sendRay($ray, $this->_depth);
if ($color !== false) {
$canvas[$x + $this->_size[0]][$y + $this->_size[1]][] = $color;
} else {
$canvas[$x + $this->_size[0]][$y + $this->_size[1]][] = $this->_background;
}
}
}
}
}
return $canvas;
}
