Sure! I've kept it barebones, with everything as default as possible
- Create sphere
- Apply Standard shader with checker pattern in diffuse (Standard so I can use the same shader in Corona and MR)
- Open RTT
- Add Corona Beauty to the output elements
- I leave this at default path and name Sphere001Corona_Beauty.tga being written to the Documents\3dsMax\sceneassets\images folder
- Render from the RTT dialogue (leaving to do the autounwrap since just a simple object and test! Sometimes lazy is good!)
- Screengrab attached of the resulting baked material, with the bitmap open - path etc is correct in that, but the preview is black
- The file does not exist at that location when I open it up
- For checking the save to an existing file, I change the "leave the default filename" for the RTT step to point to an existing file
- I change the checker colour just to be sure I know if something has changed
- Render from RTT, the file correctly appears in the baked texture and is loaded, but has not changed - second screengrab attached showing the yellow checkers that are the source material, and you can see the baked bitmap still has the old colours in it, the file was not overwritten
Performing the same steps with MR does create a file if none existed, and does overwrite the file with the render if one did exist.
Let me know if any more info would be of help!
EDIT - PS ignore the checker going into the diffuse on the baked texture :) I would normally delete that, set diffuse to 0, turn on Self Illumination, to check how that compares to the originally lit object, in this case, but didn't do that here since just testing.