Render to texture with legacy render to texture ui: controlling transparency of bake elements per script

[Robert1977]

Dear all,

I have an issue. I would like to bake out VrayBumpNormalMap to texture and I would like to save it with RGBA in 32bit OpenEXR. When doing it manually, I can adjust the alpha channel, but if I do it per script, the EXR always saves without alpha enabled.

This is my code for setting the opacity to be transparent in areas where the uv-shells are not existing:

fopenexr.setLayerOutputType 0 0
fopenexr.setDefaults()
local bm = bitmap 512 512 hdr: true
bm.filename = pathConfig.appendPath thePath "dummy.exr"
save bm
close bm
forceReloadBitmapFile bm

Could anybody help?
Thanks

[hermit.crab]

Does it happen if you remove the "fopenexr.setDefaults()" line? Could you attach the whole script?
Also, you may check this user's script, which also automates the render to texture feature just for reference.