Shadow does not match ArrayMesh

Help Shaders
, ,
1

Godot Version

4.6

Question

Hello!

I have created an ArrayMesh which is based an obj file I put into it, but the shadow that it casts is very incorrect! How can I fix this?

Here is the code I made for making it:

extends MeshInstance3D

@export var mesh_scale: Vector3
@export var mesh_scale: Vector3

var surface_array := []
var mdt := MeshDataTool.new()
var array_mesh := ArrayMesh

func _ready() -> void:
	##Import Mesh
	surface_array.resize(Mesh.ARRAY_MAX)
	mesh = imported_mesh.duplicate()
	surface_array = imported_mesh.surface_get_arrays(0)
	mesh.add_surface_from_arrays(Mesh.PRIMITIVE_TRIANGLES, surface_array)

	mdt.create_from_surface(mesh,0) 
	for i in range(mdt.get_vertex_count()):
		var vert = mdt.get_vertex(i)
		vert *= mesh_scale # Scales the mesh to the scale
		mdt.set_vertex(i, vert)
	
	#Commit mesh
	mesh.clear_surfaces() 
	mdt.commit_to_surface(mesh)
	
	#Make collider
	create_trimesh_collision()

What I mean by the shadow being incorrect is that the shadow appears to be cast from the object but from a different location to where the mesh actually is, having it cast the shadow on itself.

If it helps, I am using the gl_compatibility renderer.

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2

Oh, I did a mistake when copying over my code from godot.
The second export var is the imported_mesh variable, not the same thing twice.

3

Is there a shadow mesh in your imported mesh?

4

It is a mesh I made in blender and exported, an obj.
I don’t know if that means it comes with a shadow mesh or not.

5

You can check in the inspector. Or query it via code.

6

It appears that the Shadow Mesh is in the imported_mesh, and it has no scales or transforms applied to it.

Ah, I fixed it!
So my guess is that my transforms to the mdt was not applying to the shadowmesh when I did mdt.commit_to_surface(mesh) , so I went and added mesh.set_shadow_mesh(mdt) to my code and it fixed it!

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