OidnNetwork

The shape of the `rt` network, from OIDN's `UNetFilter::addUNet()` (https://github.com/RenderKit/oidn, `core/unet_filter.cpp`, commit `6602ee2c`, 2026-08-14).

In the namespace construct::denoise. Declared in src/libs/libconstruct/construct/denoise/OidnNetwork.hpp.

Detailed description

A U-Net of 16 convolutions over a tensor of 9 channels: the color, the albedo and the normal. The encoder halves the size four times (32, 48, 64, 80 channels) and ends in two convolutions of 96 at a sixteenth of the size. The decoder doubles it four times, each time after the encoder's output of the same size (112, 96, 64, 64 channels, then 32), and the last convolution gives 3 channels. dec_conv0 has a ReLU too.