Making terrain with repeating texture more frequent and randomness

Help Shaders
, ,
1

Godot Version

4.5.1 Mono Stable Mac OS

Question

I’m struggle to figure out how to make texture repeats more often on plane and also how can I make collision shape matching shape .

Terrain is 20x20m ( PlaneMesh )
Texture is 128x128 DXT1 RGB8, 7 Mipmaps

Here is current code

shader_type spatial;
uniform sampler2D heightmap;
uniform sampler2D terrain: source_color;
uniform vec2 terrain_size = vec2(10.0, 10.0);
uniform float height_scale = 8.0;

void vertex() {
	vec2 uv = (VERTEX.xz / terrain_size) + 0.5; 
    float h = texture(heightmap, uv).r;
    VERTEX.y += h * height_scale;
}

void fragment() {
	ALBEDO = texture(terrain, UV).rgb ;
}

Screenshot 2025-11-04 at 14.18.03
Screenshot 2025-11-04 at 14.18.031920×959 107 KB

2

Scale the sampling UVs.
Also note there’s no much use of vertex displacement in a shader if you plan to walk on the terrain. You’ll need a convex collider on the cpu side which would require displacing the vertices directly in vertex data.

1 Like
3

So what could be better way to generate terrain with collider ?

4

Displace the vertices in mesh data using Godot’s mesh editing classes.

2 Likes
5

Very complex :open_mouth:.

Is there some official demo with implemented LOD , I saw lots of Addons but most of them throws errors because were wrote for 4.2 .

It’s only Sphere and Rectangle example in documentations .

6

Not complex at all. It’s just vertex position manipulation via a very convenient and self explanatory api.

You should not worry about lod before you implement the basic displacement. You might not even need any lod.

1 Like
7 
extends MeshInstance3D

var rings = 50
var radial_segments = 50
var radius = 1

func _ready():
	var surface_array = []
	surface_array.resize(Mesh.ARRAY_MAX)

	# PackedVector**Arrays for mesh construction.
	var verts = PackedVector3Array()
	var uvs = PackedVector2Array()
	var normals = PackedVector3Array()
	var indices = PackedInt32Array()
	
	var thisrow = 0
	var prevrow = 0
	var point = 0


	for i in range(rings + 1):
			var v = float(i) / rings
			var w = sin(PI * v)
			var y = cos(PI * v)

			# Loop over segments in ring.
			for j in range(radial_segments + 1):
				var u = float(j) / radial_segments
				var x = sin(u * PI * 2.0)
				var z = cos(u * PI * 2.0)
				var vert = Vector3(x * radius * w, y * radius, z * radius * w)
				verts.append(vert)
				normals.append(vert.normalized())
				uvs.append(Vector2(u, v))
				point += 1

				# Create triangles in ring using indices.
				if i > 0 and j > 0:
					indices.append(prevrow + j - 1)
					indices.append(prevrow + j)
					indices.append(thisrow + j - 1)

					indices.append(prevrow + j)
					indices.append(thisrow + j)
					indices.append(thisrow + j - 1)

			prevrow = thisrow
			thisrow = point


	# Assign arrays to surface array.
	surface_array[Mesh.ARRAY_VERTEX] = verts
	surface_array[Mesh.ARRAY_TEX_UV] = uvs
	surface_array[Mesh.ARRAY_NORMAL] = normals
	surface_array[Mesh.ARRAY_INDEX] = indices

	# Create mesh surface from mesh array.
	# No blendshapes, lods, or compression used.
	mesh.add_surface_from_arrays(Mesh.PRIMITIVE_TRIANGLES, surface_array)
	
	ResourceSaver.save(mesh, "res://sphere.tres", ResourceSaver.FLAG_COMPRESS)

So complete code for ArrayMesh from tutorial in Doc , but when I create resource why it is not shown in 3D scene preview ?
does it need to be regenerated through code every time or loaded from resource ?

Here is demonstration

How can this be useful without preview to generate geometry ?
Is there way from blender to translate shape into vertex and then use it inside the code ?

8

Well assign the resource to instance’s mesh property.

Also if you want to alter geometry you don’t need to build it from scratch. You can start with any mesh resource, either imported or Godot’s built in primitive and use MeshDataTool to move its vertices.

1 Like
9

So for making terrains, you can start with a plane, iterate through vertices, get x and z for each vertex, sample the heightmap for those coordinates and displace vertex y accordingly. It’s simple.

1 Like
10

How to stitch them if they have different y vertex on joints ?

11

Don’t let them have different y. Sample the seamless heightmap or tile the large heightmap or generate an endless procedural heightmap.

1 Like