new method of creating preview

Scenes/Prefabs/DoubleBeds.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=14 format=3 uid="uid://0t0cvsitlfmm"]
+[gd_scene load_steps=11 format=3 uid="uid://0t0cvsitlfmm"]
 
 [ext_resource type="Script" uid="uid://c61rr6to3q566" path="res://Scripts/build_object.gd" id="1_nn5da"]
 [ext_resource type="ArrayMesh" uid="uid://cahq2fdeqqwhx" path="res://Blends/Mobel/DoubleBeds.obj" id="2_8ssp7"]
@@ -10,20 +10,7 @@
 [sub_resource type="ShaderMaterial" id="ShaderMaterial_dn7et"]
 render_priority = 0
 shader = ExtResource("3_pdq8c")
-shader_parameter/alpha = 0.5
+shader_parameter/color = Vector3(0, 0, 0)
-shader_parameter/color = Vector3(0, 1, 0)
-
-[sub_resource type="ShaderMaterial" id="ShaderMaterial_sp2kd"]
-render_priority = 0
-shader = ExtResource("3_pdq8c")
-shader_parameter/alpha = 0.5
-shader_parameter/color = Vector3(0, 1, 0)
-
-[sub_resource type="ShaderMaterial" id="ShaderMaterial_c1046"]
-render_priority = 0
-shader = ExtResource("3_pdq8c")
-shader_parameter/alpha = 0.5
-shader_parameter/color = Vector3(0, 1, 0)
 
 [sub_resource type="StandardMaterial3D" id="StandardMaterial3D_c1046"]
 albedo_texture = ExtResource("3_nn5da")
@@ -35,26 +22,10 @@ albedo_texture = ExtResource("5_sp2kd")
 [sub_resource type="StandardMaterial3D" id="StandardMaterial3D_tma46"]
 albedo_texture = ExtResource("5_sp2kd")
 
-[sub_resource type="ShaderMaterial" id="ShaderMaterial_k1k40"]
+[node name="DoubleBeds" type="Node3D" node_paths=PackedStringArray("meshInstance")]
-render_priority = 0
-shader = ExtResource("3_pdq8c")
-shader_parameter/alpha = 0.5
-shader_parameter/color = Vector3(1, 0, 0)
-
-[node name="DoubleBeds" type="Node3D" node_paths=PackedStringArray("meshInstance", "greenMeshInstance", "RedMeshInstance")]
 script = ExtResource("1_nn5da")
 meshInstance = NodePath("DoubleBeds")
-greenMeshInstance = NodePath("Green_preview")
+preview_shader = SubResource("ShaderMaterial_dn7et")
-RedMeshInstance = NodePath("Red_preview")
-
-[node name="Green_preview" type="MeshInstance3D" parent="."]
-transform = Transform3D(-4.37114e-08, 0, 1, 0, 1, 0, -1, 0, -4.37114e-08, -1.83435, 0, 0)
-visible = false
-mesh = ExtResource("2_8ssp7")
-skeleton = NodePath("../DoubleBeds")
-surface_material_override/0 = SubResource("ShaderMaterial_dn7et")
-surface_material_override/1 = SubResource("ShaderMaterial_sp2kd")
-surface_material_override/2 = SubResource("ShaderMaterial_c1046")
 
 [node name="DoubleBeds" type="MeshInstance3D" parent="."]
 transform = Transform3D(-4.37114e-08, 0, 1, 0, 1, 0, -1, 0, -4.37114e-08, -1.83435, -0.42751, 0)
@@ -62,11 +33,3 @@ mesh = ExtResource("2_8ssp7")
 surface_material_override/0 = SubResource("StandardMaterial3D_c1046")
 surface_material_override/1 = SubResource("StandardMaterial3D_k1k40")
 surface_material_override/2 = SubResource("StandardMaterial3D_tma46")
-
-[node name="Red_preview" type="MeshInstance3D" parent="."]
-transform = Transform3D(-4.37114e-08, 0, 1, 0, 1, 0, -1, 0, -4.37114e-08, -1.83435, 0, 0)
-visible = false
-mesh = ExtResource("2_8ssp7")
-surface_material_override/0 = SubResource("ShaderMaterial_k1k40")
-surface_material_override/1 = SubResource("ShaderMaterial_k1k40")
-surface_material_override/2 = SubResource("ShaderMaterial_k1k40")

Scenes/Prefabs/Pot.tscn

@@ -1,13 +1,20 @@
-[gd_scene load_steps=11 format=3 uid="uid://bcme5mx8nf5kf"]
+[gd_scene load_steps=14 format=3 uid="uid://bcme5mx8nf5kf"]
 
+[ext_resource type="Script" uid="uid://c61rr6to3q566" path="res://Scripts/build_object.gd" id="1_c5d30"]
 [ext_resource type="ArrayMesh" uid="uid://dqs5joeucls8u" path="res://Blends/Pot/pot.obj" id="1_ps8qt"]
 [ext_resource type="Texture2D" uid="uid://c4cvsuxeqt068" path="res://Blends/Pot/pot_metal.jpg" id="2_c5d30"]
+[ext_resource type="Shader" uid="uid://bfv6ckihralab" path="res://Shaders/build_transparent.gdshader" id="2_ocdig"]
 [ext_resource type="Texture2D" uid="uid://fom8shxpn476" path="res://Blends/Pot/pot_brick.jpg" id="3_ocdig"]
 [ext_resource type="Texture2D" uid="uid://bw8k6hmfrwj60" path="res://Blends/Pot/rougness_m.png" id="4_vv7mx"]
 [ext_resource type="Texture2D" uid="uid://cdb7b2ef31ixv" path="res://Blends/Pot/pot_wood.jpg" id="5_gtq0i"]
 [ext_resource type="Texture2D" uid="uid://bxgm6oovlxdjq" path="res://Blends/Pot/wood_n.png" id="6_r71lq"]
 [ext_resource type="Texture2D" uid="uid://run700pxmcyc" path="res://Blends/Pot/brick_t.png" id="7_e7ek7"]
 
+[sub_resource type="ShaderMaterial" id="ShaderMaterial_vv7mx"]
+render_priority = 0
+shader = ExtResource("2_ocdig")
+shader_parameter/color = Vector3(0, 0, 0)
+
 [sub_resource type="StandardMaterial3D" id="StandardMaterial3D_dn6sd"]
 albedo_texture = ExtResource("2_c5d30")
 roughness = 0.4
@@ -24,8 +31,11 @@ normal_texture = ExtResource("6_r71lq")
 [sub_resource type="StandardMaterial3D" id="StandardMaterial3D_rbvpf"]
 albedo_texture = ExtResource("7_e7ek7")
 
-[node name="Pot" type="Node3D"]
+[node name="Pot" type="Node3D" node_paths=PackedStringArray("meshInstance")]
 transform = Transform3D(0.5, 0, 0, 0, 0.5, 0, 0, 0, 0.5, 0, 0, 0)
+script = ExtResource("1_c5d30")
+meshInstance = NodePath("Pot")
+preview_shader = SubResource("ShaderMaterial_vv7mx")
 
 [node name="Pot" type="MeshInstance3D" parent="."]
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, 0, -3.41814, 0)

Scenes/Prefabs/cart.tscn

@@ -28,7 +28,6 @@ size = Vector3(5.40002, 3.46348, 2.28394)
 [sub_resource type="ShaderMaterial" id="ShaderMaterial_u7bw1"]
 render_priority = 0
 shader = ExtResource("6_ru0md")
-shader_parameter/alpha = 0.5
 shader_parameter/color = Vector3(0, 0, 0)
 
 [node name="Cart" type="Node3D" node_paths=PackedStringArray("cartTop")]

Scripts/build_object.gd

@@ -2,36 +2,47 @@ extends Node3D
 
 
 @export var meshInstance: MeshInstance3D
-@export var greenMeshInstance: MeshInstance3D
+@export var preview_shader: ShaderMaterial
-@export var RedMeshInstance: MeshInstance3D
 
+var default_shaders: Array
 
 func _ready() -> void:
 	Global.preview_created.connect(_on_preview_create)
 	Global.object_placed.connect(_on_object_placed)
+	set_default_shaders()
 
 
+func set_default_shaders():
+	var amount_shaders = meshInstance.get_surface_override_material_count()
+	default_shaders.resize( amount_shaders)
+	
+	for i in amount_shaders:
+		default_shaders[i] = meshInstance.get_surface_override_material(i)
+
+func restore_default_shaders():
+	for i in meshInstance.get_surface_override_material_count():
+		meshInstance.set_surface_override_material(i,default_shaders[i])
+	pass
+
+func set_preview_shader_color():
+	if true:
+		set_green_color()
+	for i in meshInstance.get_surface_override_material_count():
+		meshInstance.set_surface_override_material(i,preview_shader)
+	pass
+
 func set_green_color():
-	hide_mainMesh()
+	preview_shader.set_shader_parameter("color", Vector3(0,1.0,0))
-	greenMeshInstance.visible = true
 	
 func set_red_color():
-	hide_mainMesh()
+	preview_shader.set_shader_parameter("color", Vector3(1.0,0,0))
-	RedMeshInstance.visible = true
+	pass
 
-func hide_mainMesh():
-	meshInstance.visible = false
 
-func show_mainMesh():
-	meshInstance.visible = true
-	greenMeshInstance.visible = false
-	RedMeshInstance.visible = false
 
 func _on_preview_create():
-	set_green_color()
+	set_preview_shader_color()
 
 
 func _on_object_placed():
-	show_mainMesh()
+	restore_default_shaders()
-	greenMeshInstance.queue_free()
-	RedMeshInstance.queue_free()

Shaders/build_transparent.gdshader

@@ -1,5 +1,5 @@
 shader_type spatial;
-uniform float alpha;
+//uniform float alpha;
 uniform vec3 color;
 
 void vertex() {
@@ -8,7 +8,7 @@ void vertex() {
 
 void fragment() {
 	ALBEDO = color;
-	ALPHA = alpha;
+	ALPHA = 0.5;
 }
 
 //void light() {