File Name Schema
----------------
The P3D PBR methodology has changed the names of some texture files compared to FSX and earlier. The major changes related to aircraft textures are shown below:

New P3D Name		-	Old FSX Name / Usage
------------			--------------------
'XXX_albedo.dds'	-	'XXX.dds' / The standard diffuse texture
'XXX_normal.dds'	-	'XXX_bump.dds' / The regular 'bump' map
'XXX_metallic.dds'	-	A new file type for use with the PBR system that 'packs' the RGB 'channels' with data
##################	-	'xxx_spec.dds' / The specular file is no longer used in the PRB system as that data is now 'packed' into the 'metallic' file

Base Settings for PBR Channels
------------------------------

Alpha - Metal in shades of grey, painted sufaces 20% grey (215,215,215), matte surfaces dk.grey/black
Red Channel - Painted areas are pure black (0,0,0), metal areas are pure white (255,255,255)
Blue Channel - Inverse of alpha channel
Green Channel -  Shades of grey for shadow areas (like the FS9 way of painting shadows under wings etc.). Anything NOT SHADOW is pure white.

NOTE: The above is just a 'get you started' guide and values may have to be adjusted as req'd.

Methodology
-----------

1. Set up layers in the diffuse texture PSD file for each channel (incl. alpha) and paint as req'd.
2. When done create a new PSD file for the 'metallic' textures.
3. Make sure you have a 'Background' layer plus a layer for each of the RGB channels (incl. the alpha). The layers are there to store the channel info in case you need to make quick edits later.
4. Copy the contents of the 'Alpha' layer from the diffuse texture into the 'Alpha' layer in the 'metallic' PSD file.
5. Select all on the 'Alpha' layer, copy, then switch to the 'Background' layer and hide the 'Alpha' layer.

NOTE: THIS IS IMPORTANT - You must ALWAYS be in the 'Background' layer with only the background layer visible before trying to paste anything into the RGB channels otherwise the following process WILL NOT work!

6. Switch to the 'Channels' palette and select the 'Alpha' channel (add one if there is no existing alpha channel). Paste the new alpha channel info into place.
7. Click on the RGB channel and then switch back to the 'Layers' palette.
8. Copy the contents of the 'Red' layer from the diffuse texture into the 'Red' layer in the 'metallic' PSD file.
9. Select all on the 'Red' layer, copy, then switch to the 'Background' layer and hide the 'Red' layer.
10. Switch to the 'Channels' palette and select the 'Red' channel. Paste the new Red channel info into place.
11. Click on the RGB channel and then switch back to the 'Layers' palette.
12. Copy the contents of the 'Blue' layer from the diffuse texture into the 'Blue' layer in the 'metallic' PSD file.
13. Select all on the 'Blue' layer, copy, then switch to the 'Background' layer and hide the 'Blue' layer.
14. Switch to the 'Channels' palette and select the 'Blue' channel. Paste the new Blue channel info into place.
15. Click on the RGB channel and then switch back to the 'Layers' palette.
16. Copy the contents of the 'Green' layer from the diffuse texture into the 'Green' layer in the 'metallic' PSD file.
17. Select all on the 'Green' layer, copy, then switch to the 'Background' layer and hide the 'Green' layer.
18. Switch to the 'Channels' palette and select the 'Blue' channel. Paste the new Blue channel info into place.
19. Click on the RGB channel and then switch back to the 'Layers' palette.
20. Make sure only the 'Background' layer is visible and then 'save as' a DDS file as normal. 

NOTE: The name of the file depends on the name specified in the model's materials def. section but it is usually 'XXX_metallic.dds' where 'XXX' is the chosen name.

21. Move the new texture file into the relevant aircraft texture folder in P3D and test.

Quick Edits
-----------
1. If you need to make minor changes after testing you can turn on the relevant layer in the 'metallic' PSD file, make your changes then copy the layer and hide it. 
2. Make sure you are in the 'Background' layer with all other layers hidden then switch to the 'Channels' palette.
3. Click on the relevant 'Channel' layer and delete the contents then paste the changes into the layer.
4. Click on the RGB channel and then switch back to the 'Layers' palette.
5. Make sure only the 'Background' layer is visible and then 'save as' a DDS file as normal. 
6. Move the new texture file into the relevant aircraft texture folder in P3D (overwriting if asked) and test.
7. Rinse and repeat the above steps as necessry.

Once you are happy with the results you can copy the 'Metallic' file's 'Red', 'Green', 'Blue' and 'Alpha' layers back into their corresponding layers in the 'Diffuse' PSD file for safe keeping and then save and close the PSD files.
