message: fix shadow cascades
  breakage was due to an uninitialized variable at the beginning of the
  frame, caused by a recent change.
  shadows would disappear when cascades were used with 'stable' shadows.
diff: @@ -1184,6 +1184,8 @@ void ShadowMap::visitScene(const FScene& scene, uint32_t visibleLayers,
  void ShadowMap::initSceneInfo(ShadowMap::SceneInfo& sceneInfo,
  uint8_t visibleLayers, FScene const& scene, mat4f const& viewMatrix) {
  + sceneInfo.csNearFar = { -1.0f, 1.0f };
  + sceneInfo.lsNearFar = {};
  sceneInfo.visibleLayers = visibleLayers;
  sceneInfo.vsNearFar = { std::numeric_limits<float>::lowest(), std::numeric_limits<float>::max() };
  