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reference: add //metaball
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### `//metaball add <radius> | remove <index> | render <replace_node> [<threshold=1>] | list | clear | volume`
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Draws two or more [metaballs](https://en.wikipedia.org/wiki/Metaballs). Based on a subcommand system, since each metaball may have a different radius.
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Calling `//metaball render <replace_node>` actually makes changes to the world - all others manipulate an internal player-local list of metaballs to be drawn.
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#### `//metaball add <radius>`
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Adds a new metaball to the (player-local) list of metaballs to be draw with the given radius. The position of the new metaball is taken from pos1.
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```weacmd
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//metaball add 5
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//metaball add 10
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//metaball add 65
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```
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#### `//metaball remove <index>`
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Removes the metaball with the given index from the list. See also `//metaball list`.
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```weacmd
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//metaball remove 1
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//metaball remove 2
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//metaball remove 5
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```
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#### `//metaball render <replace_node> [<threshold=1>]`
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Renders the current list of metaballs to the world using replace_node to draw with.
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Threshold is a value that acts as an offset for large or small the metaballs should be. Defaults to 1, with larger values resulting in **smaller** metaballs and smaller values resulting in **larger** metaballs. It is not recommended to set threshold to a negative number.
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Does not clear the list of metaballs after rendering - see `//metaball clear` for that.
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```weacmd
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//metaball render dirt
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//metaball render glass
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//metaball render stone
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//metaball render stone 2
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//metaball render cobble 0.5
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```
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#### `//metaball list`
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Lists all the metaballs currently registered for the current player (all `//metaball` commands operate on the current player's metaball list only), and their indexes, positions, and sizes. Useful when using `//metaball remove <index>` to identify which metaball you want to remove.
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Example output:
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```
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Index Position Radius
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1 (-495, 37, 150) 7
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2 (-506, 33, 142) 7
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3 (-516, 35, 152) 10
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```
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```weacmd
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//metaball list
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```
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#### `//metaball clear`
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Clears the list of metaballs for the current player.
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```weacmd
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//metaball clear
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```
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#### `//metaball volume`
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Calculate an estimated volume of the metaballs currently in the list.
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```weacmd
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//metaball volume
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```
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### `//ellipsoid <rx> <ry> <rz> <node_name> [h[ollow]]`
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Creates a solid ellipsoid at position 1 with the radius `(rx, ry, rz)`.
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