basic checkered ground

ground.gdshader

@@ -0,0 +1,14 @@
+shader_type spatial;
+
+uniform vec2 dims;
+uniform vec3 light_color : source_color;
+uniform vec3 dark_color : source_color;
+
+void fragment() {
+	vec2 p = UV*dims/2.0;
+	if (round(mod(p.x,1)) == round(mod(p.y,1))) {
+		ALBEDO = light_color;
+	} else {
+		ALBEDO = dark_color;
+	}
+}

ground.gdshader.uid

@@ -0,0 +1 @@
+uid://c7e17bwc7nrgt

main.tscn

@@ -1,9 +1,10 @@
-[gd_scene load_steps=10 format=3 uid="uid://lrk2whqxl0w0"]
+[gd_scene load_steps=11 format=3 uid="uid://lrk2whqxl0w0"]
 
 [ext_resource type="Script" uid="uid://c707s0tgd88pg" path="res://main.gd" id="1_ig7tw"]
 [ext_resource type="Texture2D" uid="uid://crahyipmcudoy" path="res://ui/undo.png" id="3_lquwl"]
 [ext_resource type="Texture2D" uid="uid://dyj5el5iro1cb" path="res://ui/redo.png" id="4_7mycd"]
 [ext_resource type="Texture2D" uid="uid://cbb1q0usxd6ex" path="res://ui/restart.png" id="5_272bh"]
+[ext_resource type="Shader" uid="uid://c7e17bwc7nrgt" path="res://ground.gdshader" id="5_lquwl"]
 
 [sub_resource type="ProceduralSkyMaterial" id="ProceduralSkyMaterial_1bvp3"]
 sky_top_color = Color(0.467272, 0.753409, 0.87431, 1)
@@ -19,11 +20,15 @@ background_mode = 2
 sky = SubResource("Sky_lquwl")
 tonemap_mode = 2
 
-[sub_resource type="StandardMaterial3D" id="StandardMaterial3D_1bvp3"]
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_lquwl"]
-albedo_color = Color(0.250136, 0.493198, 0.284902, 1)
+render_priority = 0
+shader = ExtResource("5_lquwl")
+shader_parameter/dims = Vector2(64, 64)
+shader_parameter/light_color = Color(0.321254, 0.470959, 0.199863, 1)
+shader_parameter/dark_color = Color(0.308333, 0.451677, 0.191453, 1)
 
 [sub_resource type="PlaneMesh" id="PlaneMesh_1bvp3"]
-material = SubResource("StandardMaterial3D_1bvp3")
+material = SubResource("ShaderMaterial_lquwl")
 size = Vector2(64, 64)
 
 [node name="Main" type="Node3D"]
@@ -100,7 +105,7 @@ horizontal_alignment = 1
 vertical_alignment = 1
 
 [node name="Ground" type="MeshInstance3D" parent="."]
-transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, -0.1, 0)
+transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, -0.01, 0)
 mesh = SubResource("PlaneMesh_1bvp3")
 
 [connection signal="pressed" from="UndoButton" to="." method="undo"]

piece.gd

@@ -94,6 +94,9 @@ func do_move(move: Vector2i) -> Callable:
 func undo_move() -> Callable:
 	var old_pos := lpos
 	return func():
+		for tween in tweens:
+			tween.kill()
+		position = target_pos()
 		lpos = old_pos
 		tween_to_target()