Function sanitizeCameraState

pj_scene3D/core/src/camera/camera.cpp:77–89

Repair an externally-sourced CameraState (a deserialized layout, or a state adopted across a model switch) so it can never drive a degenerate projection: non-finite fields fall back to the default, then ranges are clamped (radius/ ortho_scale > 0, fov_y off 0/π, elevation off the poles). One guard for every untrusted entry point — cameraStateFromJson and each adoptState().

// ortho_scale > 0, fov_y off 0/π, elevation off the poles). One guard for every
// untrusted entry point — cameraStateFromJson and each adoptState().
CameraState sanitizeCameraState(CameraState state) {
  const CameraState defaults;
  const auto finite_or = [](float value, float fallback) { return std::isfinite(value) ? value : fallback; };
  state.focal = glm::vec3{
      finite_or(state.focal.x, defaults.focal.x), finite_or(state.focal.y, defaults.focal.y),
      finite_or(state.focal.z, defaults.focal.z)};
  state.azimuth = finite_or(state.azimuth, defaults.azimuth);
  state.elevation = std::clamp(finite_or(state.elevation, defaults.elevation), -kPolarLimit, kPolarLimit);
  state.radius = std::max(finite_or(state.radius, defaults.radius), 1e-3f);
  state.ortho_scale = std::max(finite_or(state.ortho_scale, defaults.ortho_scale), 1e-3f);
  state.fov_y = std::clamp(finite_or(state.fov_y, defaults.fov_y), glm::radians(1.0f), glm::radians(179.0f));
  return state;
}
}  // namespace

glm::mat4 OrbitCamera::viewMatrix() const {