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Changes
Update to 1.17
Blockstate JSONs are Minecraft’s way to map “variant strings” to models. A variant string can be absolutely anything, from “inventory” to “power=5” to “I am your father.” They represent an actual model, where the blockstate is just a container for them. In code, a variant string within a blockstate JSON is represented by a <code>ModelResourceLocation</code>.
Blockstate JSONs are Minecraft’s way to map “variant strings” to models. A variant string can be absolutely anything, from “inventory” to “power=5” to “I am your father.” They represent an actual model, where the blockstate is just a container for them. In code, a variant string within a blockstate JSON is represented by a <code>ModelResourceLocation</code>.
When the game searches for a model corresponding to a block in the world, it takes the [[BlockState JSONs|blockstate]] for that position, and then it uses a map within <code>ModelManager</code> to find the corresponding <code>ModelResourceLocation</code> for it, which then refers to the actual model. <code>BlockModelShapes</code> uses the block's registry name as the location of the blockstate JSON. (E.g. block <code>examplemod:testblock</code> goes to the <code>ResourceLocation</code> <code>examplemod:testblock</code>.) The variant string is pieced together from the <code>BlockState</code>'s properties.
When the game searches for a model corresponding to a block in the world, it takes the [[BlockState JSONs|blockstate]] for that position, and then it uses a map within <code>ModelManager</code> to find the corresponding <code>ModelResourceLocation</code> for it, which then refers to the actual model. <code>BlockModelShaper</code> uses the block's registry name as the location of the blockstate JSON. (E.g. block <code>examplemod:testblock</code> goes to the <code>ResourceLocation</code> <code>examplemod:testblock</code>.) The variant string is pieced together from the <code>BlockState</code>'s properties.
As an example, let’s take a look at the vanilla <code>oak_log.json</code>:
As an example, let’s take a look at the vanilla <code>oak_log.json</code>: