I think you could probably just do some queries on the stack in question & decide if you want to add the capability or not. If you can't do that I think thats something that forge should definitely provide
You're currently running Minecraft on another computer inside your computer (actually on 2 virtual machines if u count the JCM), drastically affecting performance for no reason at all. Forge and Optifine can work perfectly together on 1.12.2.
This crash doesn't appear to be caused by BetterFoliage, but be aware that BetterFoliage is incompatible with HD_U_E3, its an easy fix though. You should post your entire debug log as the offending coremod will have (hopefully) put some output about the class they are failing to patch there
Please show us your build.gradle file and the log you get after running the process with the --stacktrace and --info options. You also need to be using Java 8 and ForgeGradle2 uses a few dirty hacks which means you should use gradle wrapper 2.14 only if I remember correctly
I could be wrong, but I think you could just switch between SOLID and CUTOUT/CUTOUT_MIPPED in the getRenderLayer method based on the game settings. That really won't do anything at all performance wise, so I'm not sure why its even still an option in the game
Sorry we don't support 1.8.9 (it's 3+ years old!) or any version under 1.10 on this forum anymore due to their age. We simply don't know how to help you anymore. You can go to the Minecraft Forum where I think that they still still support older versions, or update to a modern version of Minecraft (the latest version or the one before it) to receive support on this forum.
It means your trying to load a mod that was made for 1.7.10 or lower on 1.12.2, make sure all your mods are for the appropriate minecraft version & only download them from CurseForge or the authors website
If you want your block and item model to be different then you have to have different models for them. Currently you only have the one block model, which has this parent
It also stops you ever using the world without the mod and the devs of it have said that while it’s not needed in 1.13+ there will likely be no way to convert a NEID/JEID world from 1.12.2->1.13