no...i wish.
well i used match colour (background image as source) at first to get a general hue of the background photo, with v low opacity.
then was just a case of curves, levels, hue/saturation, contrast, colour balance. selective colour, gradients, sharpness, high pass filter, offset grunge overlay for better texturing. playing with different belnding modes helps a lot
I always make sure to use adjustment layers as clipping masks too so you can fade them in/out.
once the shadows and general colour was right I flattened the image and worked on the photo and render together to add more warmth, sharpness, god rays (v pale), depth, saturation and finally a vignette at the end.
the actual render was very off in colour (very yellow and saturated) and stuck out like a sore thumb cos its texture baked from in-game images.