Method applyTransform

CesiumGltf/src/KhrTextureTransform.cpp:47–60

}

glm::dvec2
KhrTextureTransform::applyTransform(double u, double v) const noexcept {
  glm::dvec2 scaled{u * this->_scale.x, v * this->_scale.y};

  const double sin = this->_rotationSineCosine.x;
  const double cos = this->_rotationSineCosine.y;
  // u' = u cos(r) + v sin(r)
  // v' = v cos(r) - u sin(r)
  glm::dvec2 scaledAndRotated{0, 0};
  scaledAndRotated.x = scaled.x * cos + scaled.y * sin;
  scaledAndRotated.y = scaled.y * cos - scaled.x * sin;

  return scaledAndRotated + this->_offset;
}