You are setting the variant to "acacia", but your blockstates file doesn't have such a variant - it has a "type" variant with possible values of "acacia", "oak", etc. You either need to have "acacia" as a top-level variant in the blockstates file, or set the variant to "type=acacia".

Okay, so I should be setting the variant to type on all of them?

 

I found that the following also works if I set their resource location path and then create a separate item model file for each.

register(ibCampfire, 0, "expanded:oak_campfire");
    register(ibLitCampfire, 0, "expanded:oak_campfire");
    register(ibCampfire, 1, "expanded:spruce_campfire");
    register(ibLitCampfire, 1, "expanded:spruce_campfire");
    register(ibCampfire, 2, "expanded:birch_campfire");
    register(ibLitCampfire, 2, "expanded:birch_campfire");
    register(ibCampfire, 3, "expanded:jungle_campfire");
    register(ibLitCampfire, 3, "expanded:jungle_campfire");
    register(ibCampfire, 4, "expanded:acacia_campfire");
    register(ibLitCampfire, 4, "expanded:acacia_campfire");
    register(ibCampfire, 5, "expanded:dark_oak_campfire");
    register(ibLitCampfire, 5, "expanded:dark_oak_campfire");

 

Edited July 31, 20178 yr by DragonFerocity