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brightnessLight Emission

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This feature requires Minecraft client 1.21.2 or greater.

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Items

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This won't really emit light, it's only a glowing effect. This is a limitation of the game.

In the future I might find a clean way to implement smooth light that moves with the player, but for now there is not feasible solution.

1

Create your texture.

2

Create a new Java Block/Item model in Blockbench.

Note: In this case I set Parent Model to item/paper to inherit the display properties (how it's shown in hand, on ground etc.).

3

Create your model. For example you can extrude the texture like I did.

4

Adjust the model in the center.

5

Select all the cubes (press CTRL+A), right click and set the desired light level.

6

Save the file: contents/test/models/block/test_light_emission_item.json

7

Create the configuration.

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Old method

info:
  namespace: test
items:
  test_light_emission_item:
    name: test_light_emission_item
    resource:
      material: PAPER
      generate: false
      model_path: item/test_light_emission_item

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New modern method (1.21.4+)

info:
  namespace: test
items:
  test_light_emission_item:
    name: test_light_emission_item
    graphics:
      model: item/test_light_emission_item

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Blocks

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You must use REAL_TRANSPARENT block type if you want to make only a part of the block glowing and not all the block.

This happens because the game doesn't support transparency in REAL blocks.

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If you do not want to use REAL_TRANSPARENT you can create a block with a single layer which will all be glowing.

1

Create your texture.

2

Separate the glowing layer from the base layer into two images.

contents/test/textures/block/test_light_emission.png

contents/test/textures/block/test_light_emission2.png

3

Create a new Java Block/Item model in Blockbench.

4

Create two cubes, one for the base and one for the glowing layer.

5

Assign the two textures to the two different layers by drag and drop into the cubes.

6

Right click the glowing layer and set the desired light level.

7

Save the file: contents/test/models/block/test_light_emission.json

8

Create the configuration.

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Old method

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New modern method (1.21.4+)

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