首先,随便注册一个kjs方块实体:.

StartupEvents.registry("block",event=>{
    event.create("test_block","basic")
    .blockEntity(blockEntityInfo=>{
        blockEntityInfo.enableSync()//重要,设置可以同步data
    }).lightLevel(15)
})

注册渲染:startup.

global.inited = false
ClientEvents.init(event => {
    global.inited=true
    event.registerBlockEntityRenderer("kubejs:test_block", (context) => RenderJSBlockEntityRenderer
        .create(context)
        .setCustomRender((renderer, context) => {
            var poseStack = context.poseStack
            var light = LevelRenderer.getLightColor(context.blockEntityJS.level, context.blockEntityJS.blockPos.above())//获取亮度
            var item = Item.empty
            var data = context.blockEntityJS.data//读取kjs方块实体的data("同步的信息")
            if (data.contains("item")) {
                item = Item.of(data.getString("item"))
            }
   
            if (item != Item.empty) {
                poseStack.pushPose()
                poseStack.translate(0.5, 1.5, 0.5)//平移(0.5, 1.5, 0.5)
                poseStack.mulPose(Vec3f.XN.rotationDegrees(90))//x轴旋转90度
                renderer.itemRenderer.renderStatic(item, "ground", light, context.packedOverlay, context.poseStack, context.bufferSource, Client.player.getId())
                poseStack.popPose()
            }
   
            poseStack.pushPose()
            poseStack.translate(0.25, 1, 0.25)
            poseStack.scale(0.5, 0.5, 0.5)
            renderer.blockRenderDispatcher.renderSingleBlock(Blocks.FIRE.defaultBlockState(), context.poseStack, context.bufferSource, light, context.packedOverlay)
            poseStack.popPose()
        })
    )
})

右键事件: server.

const $BlockEntityJS = Java.loadClass("dev.latvian.mods.kubejs.block.entity.BlockEntityJS")
BlockEvents.rightClicked(event=>{
    var block =event.getBlock()
    var entity = block.entity
    if (entity instanceof $BlockEntityJS) {
        entity.data.putString("item",event.player.getMainHandItem().getId())
        console.log(entity.data);
        entity.sync() //手动同步
    }
})

什么?希望在游戏内调整? (client脚本)

if (global.inited) {
    var Renderer = Client.getBlockEntityRenderDispatcher().rjs$getRendererByType("kubejs:test_block")//获取render
    if (Renderer instanceof RenderJSBlockEntityRenderer) {
    //重新设置render
        Renderer.setCustomRender((renderer, context) => {
            var poseStack = context.poseStack
            var light = LevelRenderer.getLightColor(context.blockEntityJS.level, context.blockEntityJS.blockPos.above())
            var item = Item.empty
            var data = context.blockEntityJS.data
            if (data.contains("item")) {
                item = Item.of(data.getString("item"))
            }
   
            if (item != Item.empty) {
                poseStack.pushPose()
                poseStack.translate(0.5, 1.5, 0.5)
                poseStack.mulPose(Vec3f.XN.rotationDegrees(90))
                renderer.itemRenderer.renderStatic(item, "ground", light, context.packedOverlay, context.poseStack, context.bufferSource, Client.player.getId())
                poseStack.popPose()
            }
   
            poseStack.pushPose()
            poseStack.translate(0.25, 1, 0.25)
            poseStack.scale(0.5, 0.5, 0.5)
            renderer.blockRenderDispatcher.renderSingleBlock(Blocks.FIRE.defaultBlockState(), context.poseStack, context.bufferSource, light, context.packedOverlay)
            poseStack.popPose()
        })
    }
}

重新设置完毕reload client即可.

效果:

右键时火上会显示你手上的物品.