@DreamWasFucked despite the fact that you are banned, this might still be interesting:
mc.getRenderItem().renderItemAndEffectIntoGUI(ItemStack, x, y);
This worked for me. Haven't found this one on this forum yet. Maybe it helps somebody.
and if you want to get rid of some shade when rendering blocks
RenderHelper = Java.type("net.minecraft.client.renderer.RenderHelper");
RenderHelper.enableGUIStandardItemLighting()
mc.getRenderItem().renderItemIntoGUI(stack, x, y);
mc.getRenderItem().renderItemOverlays(mc.fontRendererObj, stack, x, y)
RenderHelper.disableStandardItemLighting();