Rendering problems

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I have several issues.


1) How do stop the Z-fighting on my window sill? The window sill is meant to recess all the way to the frame. 

2) PBR issue (AGAIN) - why do different walls with the same texture exposed to the same lighting conditions render differently?

3) PBR issue (AGAIN) - How do I maintain the brightness of the backdrop while reducing the brightness of everything else? ( Please do not refer me to the PBR thread, it is most unhelpful and does not address my problem). If you reduce the exposure, it darkens the backdrop. If you reduce the brightness, it darkens the backdrop. If you reduce the sunlight it darkens the backdrop. 


(PS David Potter need not reply unless he actually has a solution.)

WSZ 1.jpg



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