public function getColor(Image_3D_Interface_Enlightenable $polygon)
{
$color = clone $polygon->getColor();
$light = new Image_3D_Vector($this->_x, $this->_y, $this->_z);
$light->sub($polygon->getPosition());
$light->unify();
$light->add(new Image_3D_Vector(0, 0, -1));
$normale = $polygon->getNormale();
$angle = abs(1 - $normale->getAngle($light));
$color->addLight($this->_color, $angle);
return $color;
}
public function getColor(Image_3D_Interface_Enlightenable $polygon)
{
$color = clone $polygon->getColor();
$light = new Image_3D_Vector($this->_x, $this->_y, $this->_z);
$light->sub($polygon->getPosition());
$distance = $light->length();
if ($distance > $this->_distance) {
return $color;
}
$factor = 1 - pow($distance / $this->_distance, $this->_falloff);
$light->unify();
$light->add(new Image_3D_Vector(0, 0, -1));
$normale = $polygon->getNormale();
$angle = abs(1 - $normale->getAngle($light));
$color->addLight($this->_color, $angle * $factor);
return $color;
}
public function getColor(Image_3D_Interface_Enlightenable $polygon)
{
$color = clone $polygon->getColor();
$light = new Image_3D_Vector($this->_x, $this->_y, $this->_z);
$light->sub($polygon->getPosition());
$light->unify();
$angle = $light->getAngle($this->_direction);
if ($angle > $this->_angle) {
return $color;
}
if ($this->_float) {
$factor = 1 - pow($angle / $this->_angle, $this->_float);
} else {
$factor = 1;
}
$light->add(new Image_3D_Vector(0, 0, -1));
$normale = $polygon->getNormale();
$angle = abs(1 - $normale->getAngle($light));
$color->addLight($this->_color, $angle * $factor);
return $color;
}
public function getAngle(Image_3D_Vector $vector)
{
$vector->unify();
$this->unify();
return acos($this->_x * $vector->getX() + $this->_y * $vector->getY() + $this->_z * $vector->getZ()) * 2 / pi();
}