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I think it's time to introduce front/back map to you. Right now, sun facing sides of your leaves, have way to much translucency, while back faces looks ok.
You can save a LOT of time by instancing maps as much as possible in shadertrees and different slots of a single material.
How is that technically? What are the drawbacks of non-instanced but identical bitmap maps? I never really thought about it since I try to instance as much as possible but is each non-instanced bitmap loaded separately into RAM (I can hardly imagine that) or is it just the internal overhead that is produced by multiple bitmap loaders?
Each map is not loaded into RAM separately, but each map is sampled separately if they are not instanced. 3dsmax actually has a caching mechanism implemented that allows reusing the first instance result for all subsequent ones. So instancing single map 4 times can make your shader evaluation 4 times faster.
You're doing this mistake again. Tree leaves doesn't need refraction. By puting map in this slot, you hurting both, material believability and render time. Don't do this.
Edit: btw, if that map structure for translucency slot, you borrowed from my scene, you may want to replace it by something else. I did it in hurry and i don't think it's suitable in this situation. I feel guilty for this :]
Hah, there is no real reason, that's because I was doing it very quickly and dirty. :)
You can save a LOT of time by instancing maps as much as possible in shadertrees and different slots of a single material.
When changing lighting conditions...Let's say from HDRI or sun. You might need to modify your your diffuse color settings based on lit environment. It would be killer if i can adjust all my diffuse channels by certain percentages to compensate for lighting conditions.
Perhaps change Reflection, Refract, AO params as well.
That just means you have done your materials wrong in the first place. So learn to make them right. If you change lighting, and your scene is too dark on bright, then you compensate with exposure adjustments, not materials. That just does not make any sense. If Corona had implemented additional settings to compensate for various wrong workflows of various users, UI would have thousands of buttons.
