Basics of MESH GENERATION in Godot 4 0

[@Grymyrk]

I remember I did this exact exercise years ago at university except it was with opengl.

[@Jim-Works]

Note to future people: if you want correct lighting on the cube, you need to have 4 unique vertices per face, and set the normals to be pointing out of the cube. So the top face would have 4 verts all with (0,1,0) normals, the bottom would have 4 verts with (0,-1,0) normals, etc. If you only use 8 verts for the whole cube, the lighting gets smoothed out over the faces, which you can see at the end of the video

[@freevbucks8019]

So I'd need 16 vector2? I don't get how I should set it up

[@thomaseubank1503]

@@freevbucks8019 Yeah I need more clarification too. I also am not fully sure if I understand how to set up which way the face is.

[@freevbucks8019]

@@thomaseubank1503 after dicking around too much you need a normal per vertice declared by the triangle. I guess it would be easier to fiddle with OpenGL at this point

[@HurricaneSA]

Or much easier, just add surface_tool.set_smooth_group(-1) right after surface_tool.begin(). It turns smoothing off, so you don't have to manually set normals.

[@niquedegraaff]

Try not to abbreviate variable names. If you teach this yourself, you will write code, that others are having a hard time to read. It's perfectly ok, to name surftool surfaceTool and a_mesh meshArray

[@MrManGoYou]

reload save scene at some point stop working for me and shape remain unchanged

[@thomaseubank1503]

I am trying to see if I can make a Doom style level editor in Godot 4. This was super helpful, thanks!

[@thomasparker7305]

Also if I'm not mistaken if someone adds mesh_instance.create_trimesh_collision() it will add a collider. Have to name it the name of the mesh not my mesh_instance have I named mine. Unless Godot 4 changed that

[@Chevifier]

After you assign the array mesh to the mesh instance just call "create_trimesh_collision()" on the mesh instance it should work fine but for terrain you have a heightmap shape you should use instead IF your planning the generate terrain

[@Chevifier]

You can also do it from the editor dropdown as well if you used the generator script as a tool script.

[@rahultandon9749]

Quality/Quantity of Godot videos best in gaming industry, better than that of Unity. I dream of the day when UNREAL decides to document completely. C# could not be as efficient as C++. The entire thing about GODOT is feasibility by the INDE , the other 2: UNITY, UNREAL might not be able to say the same for the INDE nor for the big teams. The open source of GODOT provides a long term dream by itself for the serious developer. Godot makes it possible to plan rather than make something first and then let's see attitude in the other 2.

[@thomasparker7305]

Very helpful thank you. I might have some questions later lol

[@Chevifier]

Sure, let me know what you need help with.

[@ParthaSarathylink]

This is really cool. But I don't understand how UV mapped in godot why blender involved here and how material is applied using UV

[@Chevifier]

I was just using blender to demonstrate what i was doing in Godot with the UVs

[@albegago]

In the video the complete code is illegible...
The code to create the triangle:
@tool
extends MeshInstance3D
@export var update = false
func _ready():
gen_mesh()
func _process(delta:float):
if update:
gen_mesh()
func gen_mesh():
var a_mesh = ArrayMesh.new()
var vertices := PackedVector3Array([
Vector3(0,0,0),
Vector3(20,0,0),
Vector3(20,0,20),
])
var indices := PackedInt32Array([0,1,2])
var array = []
array.resize(Mesh.ARRAY_MAX)
array[Mesh.ARRAY_VERTEX] = vertices
array[Mesh.ARRAY_INDEX] = indices
a_mesh.add_surface_from_arrays(Mesh.PRIMITIVE_TRIANGLES,array)
mesh = a_mesh
You have to save the scene, then in the menu choose SCENE > RELOAD SAVED SCENE
And finally, there is a triangle....

[@Chareidos]

Is it possible to create or edit a mesh and adding/removing bones for a 3DSkeleton in Godot in Runtime?
Like in Spore or with Creature Creator (made in unity), dragging a Node and creating new vertices with a corresponding bone (or any other useful Node)?

[@sandiguha]

I would like to ask what could be the applications with this? Great tutorial btw.

[@pixelrogue]

You could use it to destroy terrains for instance

[@bioman1hazard607]

can you put the code in the comments for this. i put everything exactly as you typed but it still gives me errors, so i have no idea what im doing

[@Chevifier]

Ive added the code to the description. But its for infinite terrain.

[@bioman1hazard607]

@Chevifier thanks, tho I wish it were the Code for this vid, I'll still see if I can use it to make something

[@Red_Eagle]

any source code?

[@Loethor]

any problem if I try to replicate this in godot 3.5.x?

[@Chevifier]

Maybe a few function differences but for the most part the process is the same

[@jethdaflip7741]

Why not use C# instead of gdscript? Isn't performance better with C#?

[@Chevifier]

It definitely is better. But most users use the Regular Godot Engine and not the DotNet version.

[@Evgeniy_Sugonyako]

You are my God by GODOT ;-)

[@Ali-bh6be]

promosm 💖

[@ububox2087]

AHHHHG!!!!! what did you hide at 5:55 ?????
you move too fast and didn't explain what "and we (pass that array??)" means or show what was typed or what the auto complete was. Also mesh = a_mesh just throws error Parser Error: Identifier "mesh" not declared in the current scope. If I add var mesh in the scope the preceding line then throws error Invalid type in function 'add_surface_from_arrays' in base 'ArrayMesh'. Cannot convert argument 2 from Object to Array.
Seriously terrible tutorial - rushed, and poorly explained.

[@Chevifier]

Sorry about that it was:
a_mesh.add_surface_from_arrays(Mesh.PRIMATIVE_TRIANGLES,array)
Its the array I assign the vertices and indices to at line 29 to 32.

[@bioman1hazard607]

it doesnt work on my end for some reason@@Chevifier

[@MedioTaffy]

For future reference, pause the video and use the buttons to go frame by frame

[@frogfrogfrogd]

@@bioman1hazard607 check if you have PackedFloat32Array instead of PackedInt32Array, it should be PackedInt32Array