/**
* Calculates the front vector from the Camera's (updated) Eular Angles
*/
public function updateVectors()
{
// Calculate the new front vector
$front = new vec3();
$front->x = cos(\glm\radians($this->yaw)) * cos(\glm\radians($this->pitch));
$front->y = sin(\glm\radians($this->pitch));
$front->z = sin(\glm\radians($this->yaw)) * cos(\glm\radians($this->pitch));
$this->front = \glm\normalize($front);
// Also re-calculate the right and up vector
$this->right = \glm\normalize(\glm\cross($this->front, $this->worldUp));
// Normalize the vectors, because their length gets closer to 0 the more you look up or down which results in slower movement.
$this->up = \glm\normalize(\glm\cross($this->right, $this->front));
}
/**
* @param string $path
* @return WavefrontObj
*/
public function load($path)
{
if (!file_exists($path)) {
throw new LoaderException('File not found: ' . $path);
}
$obj = new WavefrontObj();
// $obj = new Mesh;
$file = new \SplFileObject($path);
$file->setFlags(\SplFileObject::DROP_NEW_LINE);
while (!$file->eof()) {
$line = $file->fgets();
if (empty($line)) {
continue;
}
if ($line[0] == '#') {
continue;
}
$tokens = explode(' ', $line);
$type = $tokens[0];
switch ($type) {
case 'v':
$vertex = new vec3();
list($vertex->x, $vertex->y, $vertex->z) = sscanf($line, 'v %f %f %f');
$obj->vertices[] = $vertex;
break;
case 'vt':
$uv = new Vec2();
list($uv->x, $uv->y) = sscanf($line, 'vt %f %f');
$obj->textureCoordinates[] = $uv;
break;
case 'vn':
$vertex = new vec3();
list($vertex->x, $vertex->y, $vertex->z) = sscanf($line, 'vn %f %f %f');
$obj->normals[] = $vertex;
break;
case 'f':
$vertin = new vec3();
$uvin = new vec3();
$normin = new vec3();
if (preg_match('@f -?\\d+/-?\\d+/-?\\d+ -?\\d+/-?\\d+/-?\\d+ -?\\d+/-?\\d+/-?\\d+@', $line)) {
list($vertin->x, $uvin->x, $normin->x, $vertin->y, $uvin->y, $normin->y, $vertin->z, $uvin->z, $normin->z) = sscanf($line, 'f %d/%d/%d %d/%d/%d %d/%d/%d');
$obj->verticesIndices[] = $vertin->x;
$obj->verticesIndices[] = $vertin->y;
$obj->verticesIndices[] = $vertin->z;
}
if (preg_match('@f -?\\d+//-?\\d+ -?\\d+//-?\\d+ -?\\d+//-?\\d+@', $line)) {
list($vertin->x, $normin->x, $vertin->y, $normin->y, $vertin->z, $normin->z) = sscanf($line, 'f %d//%d %d//%d %d//%d');
$obj->verticesIndices[] = $vertin->x;
$obj->verticesIndices[] = $vertin->y;
$obj->verticesIndices[] = $vertin->z;
} elseif (preg_match('@f\\s+\\d+\\s+\\d+\\s+\\d+@', $line)) {
list($vertin->x, $vertin->y, $vertin->z) = sscanf($line, 'f %d %d %d');
$obj->verticesIndices[] = $vertin->x;
$obj->verticesIndices[] = $vertin->y;
$obj->verticesIndices[] = $vertin->z;
}
break;
}
}
$obj->normals = [];
$obj->normals = array_fill(0, count($obj->vertices), new vec3(0.0, 0.0, 0.0));
$nb_seen = array_fill(0, count($obj->vertices), 0);
for ($i = 0; $i < count($obj->verticesIndices); $i += 3) {
$ia = $obj->verticesIndices[$i] - 1;
$ib = $obj->verticesIndices[$i + 1] - 1;
$ic = $obj->verticesIndices[$i + 2] - 1;
$normal = \glm\normalize(\glm\cross($obj->vertices[$ib]->substract($obj->vertices[$ia]), $obj->vertices[$ic]->substract($obj->vertices[$ia])));
$v = array($ia, $ib, $ic);
for ($j = 0; $j < 3; $j++) {
$cur_v = $v[$j];
$nb_seen[$cur_v]++;
if ($nb_seen[$cur_v] == 1) {
$obj->normals[$cur_v] = $normal;
} else {
// average
$obj->normals[$cur_v]->x = $obj->normals[$cur_v]->x * (1.0 - 1.0 / $nb_seen[$cur_v]) + $normal->x * 1.0 / $nb_seen[$cur_v];
$obj->normals[$cur_v]->y = $obj->normals[$cur_v]->y * (1.0 - 1.0 / $nb_seen[$cur_v]) + $normal->y * 1.0 / $nb_seen[$cur_v];
$obj->normals[$cur_v]->z = $obj->normals[$cur_v]->z * (1.0 - 1.0 / $nb_seen[$cur_v]) + $normal->z * 1.0 / $nb_seen[$cur_v];
$obj->normals[$cur_v] = \glm\normalize($obj->normals[$cur_v]);
}
}
}
return $obj;
}
