editor/editable_terrain.gd

@@ -0,0 +1,100 @@
+class_name EditableTerrain extends Node
+
+var _image := Image.create(1, 1, false, Image.FORMAT_RGBAF)
+
+##
+##
+##
+@export
+var channels := Vector3.ZERO
+
+##
+##
+##
+@export
+var size := Vector2i.ZERO:
+	get:
+		return size
+
+	set(value):
+		_image.resize(value.x, value.y)
+		_image.fill(Color(0.0, 0.0, 0.0, 0.5))
+
+		size = value
+
+##
+##
+##
+func get_image() -> void:
+	return _image
+
+##
+##
+##
+func paint(point: Vector2i, elevation_level: float,
+	brush_mask: Image, brush_scale: float, brush_intensity: float) -> void:
+
+	# Convert worldspace point to image-space coordinates for brush and calculate drawable area.
+	var brush_mask_size := brush_mask.get_size()
+	var brush_size := brush_mask_size * brush_scale
+	var image_size := _image.get_size()
+
+	var draw_area := Rect2i(Vector2i.ZERO, image_size).intersection(
+		Rect2i((point - Vector2i(brush_size * 0.5)) + Vector2i(image_size * 0.5), brush_size))
+
+	if draw_area.has_area():
+		var scaled_brush_mask_size := brush_mask_size / draw_area.size
+
+		elevation_level = clampf(elevation_level, -1.0, 1.0)
+
+		for y in draw_area.size.y:
+			var brush_mask_y := int(y * scaled_brush_mask_size.y)
+
+			for x in draw_area.size.x:
+				var terrain_map_coord := draw_area.position + Vector2i(x, y)
+				var pixel := _image.get_pixelv(terrain_map_coord)
+
+				var mask := brush_mask.get_pixel(
+					int(x * scaled_brush_mask_size.x), brush_mask_y).a
+
+				var mask_intensity := brush_intensity * mask
+
+				_image.set_pixelv(terrain_map_coord, Color(
+					lerpf(pixel.r, channels.x, mask_intensity),
+						lerpf(pixel.g, channels.y, mask_intensity),
+							lerpf(pixel.b, channels.z, mask_intensity),
+								lerpf(pixel.a, pixel.a + (elevation_level * mask), brush_intensity)))
+
+##
+##
+##
+func smooth(point: Vector2i, smoothing_level: float,
+	brush_mask: Image, brush_scale: float, brush_intensity: float) -> void:
+
+	# Convert worldspace point to image-space coordinates for brush and calculate drawable area.
+	var brush_mask_size := brush_mask.get_size()
+	var brush_size := brush_mask_size * brush_scale
+	var terrain_map_size := _image.get_size()
+
+	var draw_area := Rect2i(Vector2i.ZERO, terrain_map_size).intersection(
+		Rect2i((point - Vector2i(brush_size * 0.5)) +\
+			Vector2i(terrain_map_size * 0.5), brush_size))
+
+	if draw_area.has_area():
+		var scaled_brush_mask_size := brush_mask_size / draw_area.size
+
+		for y in draw_area.size.y:
+			var brush_mask_y := int(y * scaled_brush_mask_size.y)
+
+			for x in draw_area.size.x:
+				var terrain_map_coord := draw_area.position + Vector2i(x, y)
+				var pixel := _image.get_pixelv(terrain_map_coord)
+
+				var mask_intensity := brush_intensity * brush_mask.get_pixel(
+					int(x * scaled_brush_mask_size.x), brush_mask_y).a
+
+				_image.set_pixelv(terrain_map_coord, Color(
+					lerpf(pixel.r, channels.x, mask_intensity),
+						lerpf(pixel.g, channels.y, mask_intensity), 
+							lerpf(pixel.b, channels.z, mask_intensity),
+								lerpf(pixel.a, smoothing_level, mask_intensity)))

project.godot

@@ -9,6 +9,11 @@
 config_version=5
 
 _global_script_classes=[{
+"base": "Node",
+"class": &"EditableTerrain",
+"language": &"GDScript",
+"path": "res://editor/editable_terrain.gd"
+}, {
 "base": "Node3D",
 "class": &"PlayerController",
 "language": &"GDScript",
@@ -25,6 +30,7 @@ _global_script_classes=[{
 "path": "res://terrain_instance_3d.gd"
 }]
 _global_script_class_icons={
+"EditableTerrain": "",
 "PlayerController": "",
 "Settings": "",
 "TerrainInstance3D": ""