Marching Squares (experimental)

Allow to build a "scalar field" and draw contour lines of it: useful for fog of wars, liquid effects, paint the ground, etc...

Authors and contributors to this community extension: D8H.

It can be helpful for:

Liquid effects like water, blobs or lava (open the project online)
Fog of wars (open the project online)
Platformer with destructible platforms (open the project online)
Dynamically paint territories (open the project online)
Top-down relief with physics (open the project online)
Island generator (open the project online)

Marching squares painter

Add to a Shape painter object and use the actions to draw a field. Useful for fog of wars, liquid effects (water, lava, blobs...).

Behavior actions

Add a disk
Add a disk to the field.

Add a hill
Add a hill to the field.

Add a line
Add a line to the field.

Clamp the field
Cap every value of the field to a range.

Clear the field
Clear the field by setting every values to 0.

Draw the contours
Draw the field contours.

Fill area
Fill an area of the field from a given location until a given height is reached.

Mask a disk
Mask a disk to the field.

Mask a line
Mask a line to the field.

Merge a field
Apply a given operation on every value of the field using the value from the other field at the same position.

Area bounds
Change the field area bounds.

Height of the cells
Change the height of the field cells.

Width of the cells
Change the width of the field cells.

Fill outside
Fill outside or inside of the contours.

Grid value
Change the field value at a grid point.

Contour threshold
Change the contour threshold.

Transform the field
Apply an affine on the field values.

Update hitboxes
Update the field hitboxes.

Unfill area
Unfill an area of the field from a given location until a given height is reached.

Behavior conditions

Field value
Check if a field is greater than a given value.

Fill outside
Check if the contours are filled outside.

Point is inside
Check if a point is inside the contour.

Behavior expressions

Expression	Description
`Object.MarchingSquaresBehavior::AreaBottom()`	Area bottom bound of the field.
`Object.MarchingSquaresBehavior::AreaLeft()`	Area left bound of the field.
`Object.MarchingSquaresBehavior::AreaRight()`	Area right bound of the field.
`Object.MarchingSquaresBehavior::AreaTop()`	Area top bound of the field.
`Object.MarchingSquaresBehavior::CellHeight()`	Height of the field cells.
`Object.MarchingSquaresBehavior::CellWidth()`	Width of the field cells.
`Object.MarchingSquaresBehavior::ContourThreshold()`	The contour threshold.
`Object.MarchingSquaresBehavior::DimensionX()`	The number of cells on the x axis.
`Object.MarchingSquaresBehavior::DimensionY()`	The number of cells on the y axis.
`Object.MarchingSquaresBehavior::FieldValue(number, number)`	The field value at a given location.
	🔢 Number	X position of the point
	🔢 Number	Y position of the point
`Object.MarchingSquaresBehavior::GridValue(number, number)`	The field value at a grid point.
	🔢 Number	X grid index
	🔢 Number	Y grid index
`Object.MarchingSquaresBehavior::NormalX(number, number)`	The normal X coordinate at a given location.
	🔢 Number	X position of the point
	🔢 Number	Y position of the point
`Object.MarchingSquaresBehavior::NormalY(number, number)`	The normal Y coordinate at a given location.
	🔢 Number	X position of the point
	🔢 Number	Y position of the point
`Object.MarchingSquaresBehavior::NormalZ(number, number)`	The normal Z coordinate at a given location.
	🔢 Number	X position of the point
	🔢 Number	Y position of the point

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