how to understand draco::EncoderOptions

Can somebody help me understand the below function?

I am struggling to understand draco::EncoderOptions
This is the function implemented by the former worker. After getting this draco process, the intensity values seem to be different with original value. May I know how to get the original value in cesium side?

```
draco::PointCloudBuilder builder;
draco::EncoderBuffer encoder_buffer;
draco::PointCloudSequentialEncoder encoder;
draco::EncoderOptions options = draco::EncoderOptions::CreateDefaultOptions();
```

```
void DPNTSGenerator::finalizePoints()
{
const auto point_cloud = builder.Finalize(false);

options.SetAttributeFloat(point_cloud->GetNamedAttributeId(draco::GeometryAttribute::POSITION), "quantization_bits", 14);
options.SetAttributeFloat(point_cloud->GetNamedAttributeId(draco::GeometryAttribute::NORMAL), "quantization_bits", 14);
options.SetAttributeInt(point_cloud->GetNamedAttributeId(draco::GeometryAttribute::COLOR), "quantization_bits", 8);
options.SetAttributeFloat(intensity_id, "quantization_bits", 14);

encoder.SetPointCloud(*point_cloud);

encoder_buffer.Clear();
const auto status = encoder.Encode(options, &encoder_buffer);
if (!status.ok())
{
// failed to encode
std::cerr << status << std::endl;
return;
}

const auto& buffer = encoder_buffer;
writeFeatureTableBinary(buffer.data(), buffer.size());
}
```

I have tried to adjust there parameters

```
options.SetAttributeFloat(point_cloud->GetNamedAttributeId(draco::GeometryAttribute::POSITION), "quantization_bits", 14);
options.SetAttributeFloat(point_cloud->GetNamedAttributeId(draco::GeometryAttribute::NORMAL), "quantization_bits", 14);
options.SetAttributeInt(point_cloud->GetNamedAttributeId(draco::GeometryAttribute::COLOR), "quantization_bits", 8);
options.SetAttributeFloat(intensity_id, "quantization_bits", 14);
```

But I can't get satisfactory results.

Is there any mention of the API's comment of SetAttributeFloat?