Function directionFromView

Cesium3DTilesSelection/src/ViewState.cpp:60–63

}

glm::dvec3 directionFromView(const glm::dmat4& viewMatrix) {
  return glm::dvec3(viewMatrix[0][2], viewMatrix[1][2], viewMatrix[2][2]) *
         -1.0;
}
} // namespace

// The near and far plane values don't matter for frustum culling.