Rijad Zuzo
83 lines
3.1 KiB
GDScript
83 lines
3.1 KiB
GDScript
extends Node3D
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@export var terrain_path := NodePath("../../TerrainRoot/Terrain3D")
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@export var river_material: Material
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@export_range(6.0, 20.0, 0.5) var river_width := 8.0
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@export_range(2, 12, 1) var width_segments := 6
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@export_range(8, 96, 1) var length_segments := 36
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@export var local_start_z := -25.0
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@export var local_end_z := 40.0
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@export_range(0.05, 0.5, 0.01) var water_offset := 0.18
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@onready var river_ribbon: MeshInstance3D = $RiverRibbon
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func _ready() -> void:
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call_deferred("_build_terrain_ribbon")
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func _build_terrain_ribbon() -> void:
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var terrain := get_node_or_null(terrain_path) as Terrain3D
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if terrain == null or terrain.data == null or river_material == null:
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push_warning("TerrainRiverRibbon: terrain or material is unavailable")
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return
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var vertices := PackedVector3Array()
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var normals := PackedVector3Array()
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var uvs := PackedVector2Array()
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var indices := PackedInt32Array()
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var row_size := width_segments + 1
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for z_index in length_segments + 1:
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var progress := float(z_index) / float(length_segments)
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var local_z := lerpf(local_start_z, local_end_z, progress)
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var downstream_curve := smoothstep(0.58, 1.0, progress) * 12.0
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var center_offset := sin(progress * TAU) * 1.4 + downstream_curve
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var downstream_taper := lerpf(1.0, 0.45, smoothstep(0.65, 1.0, progress))
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var half_width := river_width * lerpf(0.52, 0.45, progress) * downstream_taper
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for x_index in width_segments + 1:
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var across := float(x_index) / float(width_segments)
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var local_x := center_offset + lerpf(-half_width, half_width, across)
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var world_sample := to_global(Vector3(local_x, 0.0, local_z))
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var terrain_height := terrain.data.get_height(world_sample)
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if is_nan(terrain_height):
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terrain_height = global_position.y
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vertices.append(
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to_local(Vector3(world_sample.x, terrain_height + water_offset, world_sample.z))
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)
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normals.append(Vector3.UP)
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uvs.append(Vector2(across, progress))
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for z_index in length_segments:
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for x_index in width_segments:
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var top_left := z_index * row_size + x_index
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var top_right := top_left + 1
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var bottom_left := top_left + row_size
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var bottom_right := bottom_left + 1
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indices.append_array(
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[top_left, bottom_left, top_right, top_right, bottom_left, bottom_right]
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)
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var arrays := []
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arrays.resize(Mesh.ARRAY_MAX)
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arrays[Mesh.ARRAY_VERTEX] = vertices
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arrays[Mesh.ARRAY_NORMAL] = normals
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arrays[Mesh.ARRAY_TEX_UV] = uvs
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arrays[Mesh.ARRAY_INDEX] = indices
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var mesh := ArrayMesh.new()
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mesh.add_surface_from_arrays(Mesh.PRIMITIVE_TRIANGLES, arrays)
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mesh.surface_set_material(0, river_material)
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river_ribbon.mesh = mesh
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_align_pool_to_terrain(terrain)
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func _align_pool_to_terrain(terrain: Terrain3D) -> void:
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var pool := $PlungePool as MeshInstance3D
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var pool_sample := to_global(Vector3(pool.position.x, 0.0, pool.position.z))
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var pool_height := terrain.data.get_height(pool_sample)
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if is_nan(pool_height):
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return
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var local_surface := to_local(Vector3(pool_sample.x, pool_height + water_offset, pool_sample.z))
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for node_name in [&"PlungePool", &"FoamRing", &"FoamAtFall"]:
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var surface := get_node(NodePath(node_name)) as MeshInstance3D
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surface.position.y = local_surface.y
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