first examples

shaders/000_playground/playground.gd

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+@tool
+extends Node3D
+
+@export var my_variable: float = 1.0:
+	set(value):
+		my_variable = value
+		shader_material.set_shader_parameter("my_variable", value)
+
+@onready var shader_material = $MeshInstance3D.mesh.material
+
+func _ready() -> void:
+	print(shader_material)
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(delta: float) -> void:
+	pass

shaders/000_playground/playground.gdshader

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+shader_type spatial;
+
+uniform float my_variable = 0.0;
+
+void vertex() {
+	VERTEX.y += my_variable;
+	// Called for every vertex the material is visible on.
+}
+
+void fragment() {
+	ALBEDO = NORMAL;
+	// Called for every pixel the material is visible on.
+}

shaders/000_playground/playground.tscn

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+[gd_scene load_steps=5 format=3 uid="uid://c0c1k04qmog56"]
+
+[ext_resource type="Shader" path="res://shaders/000_playground/playground.gdshader" id="1_0fhw0"]
+[ext_resource type="Script" path="res://shaders/000_playground/playground.gd" id="1_08keh"]
+
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_h8cto"]
+render_priority = 0
+shader = ExtResource("1_0fhw0")
+shader_parameter/my_variable = 1.0
+
+[sub_resource type="SphereMesh" id="SphereMesh_6preo"]
+material = SubResource("ShaderMaterial_h8cto")
+
+[node name="Playground" type="Node3D"]
+script = ExtResource("1_08keh")
+
+[node name="MeshInstance3D" type="MeshInstance3D" parent="."]
+mesh = SubResource("SphereMesh_6preo")