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voxelShape object

You can customize the Shape of your block.
Precisely, the base shape, and collisionShape (hitboxes).

VoxelShapes are not really complicated to understand, but it's to explain.

So, if your block's hitboxes doesn't need to be "resized", don't put this properties.

Example

[
  {
    "registryName": "test_voxel_shape",
    "voxelShape": {
      "shape": {
        "x1": 1,
        "y1": 0,
        "z1": 1,
        "x2": 15,
        "y2": 16,
        "z2": 15
      },
      "collisionShape": {
        "x1": 1,
        "y1": 0,
        "z1": 1,
        "x2": 15,
        "y2": 15,
        "z2": 15
      }
    }
  }
]

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Values

The voxelShape are a JsonObject ({}) with 3 configurables shapes objects.

Due to a cuboidal shape of these objects
You need to define a starting and ending point of the shape.
_{(Like the /fill command in Minecraft)}

Start Point Position : x1, y1, z1
End Point Position : x2, y2, z2

Theses points accept Integer and Decimal values

"shape" : {
      "x1": 1.0,
      "y1": 0,
      "z1": 1,
      "x2": 15.5,
      "y2": 16.12,
      "z2": 15
    }

Cactus Shape Example

"shape" : {
  "x1": 1,
  "y1": 0,
  "z1": 1,
  "x2": 15,
  "y2": 16,
  "z2": 15
}

Flower Pot Shape Example

"shape" : {
  "x1": 5,
  "y1": 0,
  "z1": 5,
  "x2": 11,
  "y2": 6,
  "z2": 11
}

So, basically that's the same way for the collisionShape or the renderShape

Tip

To make tests.
I probably implements a Voxel Shape pre renderer to test your values in-game.