Weird lighting issues - doing the catlikecoding hex map tutorials in Godot

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Godot Version

Godot 4.3

Question

Hey all,

I am fairly new to Godot, but I am an experienced programmer in general. I am really enjoying Godot so far. I have been working through the “catlikecoding” hex map tutorials that were written for Unity (link: Unity Hex Map Tutorials), and I have been implementing them in Godot as a way to learn.

So far it’s been going well. I’ve implemented the first 3 hex map tutorials in Godot. Everything is working great, but I am having a weird issue with lighting and I don’t know enough to fix it on my own. Basically, to summarize the issue: everything in my scene is shaded weird.

Here is how the scene should look (this is the image taken straight from catlikecoding’s tutorials):

hex_project_image_original
hex_project_image_original920×500 91.3 KB

Here is how my scene actually looks (ignore the fact that my hex map is 7x7 instead of 6x6):

hex_project_image_01
hex_project_image_011953×981 245 KB

I know that it is a lighting issue. When I use Godot’s “debug drawing mode” to turn off lighting effects, this is what I see:

hex_project_image_02
hex_project_image_021964×990 239 KB

Additionally, when I use the “debug drawing mode” to only look at lighting, this is what I see:

hex_project_image_03
hex_project_image_031932×984 85.8 KB

With regard to how the scene is set up, it is pretty simple. I just have the hex grid and then I have an omnidirectional light placed above the hex grid:

scene_makeup

To create each of the hexes in the scene, I am generating them procedurally (as is done in the catlikecoding tutorial). To generate the meshes, I use Godot’s SurfaceTool. Code is below:

func _create_mesh () -> void:
	#Get an instance of the surface tool
	var surface_tool = SurfaceTool.new();
	
	#Begin creating the mesh
	surface_tool.begin(Mesh.PRIMITIVE_TRIANGLES);
	
	#Iterate over each of the 6 directions from the center of the hex
	for i in range(0, 6):
		#Form the mesh for this direction of the hex
		_triangulate_hex(surface_tool, i)
	
	#Generate the normals for the mesh
	surface_tool.generate_normals()
	
	#Generate the tangents for the mesh
	surface_tool.generate_tangents()
	
	#Commit the mesh
	visualization.mesh = surface_tool.commit()
	
	#Create the collision object for the mesh
	visualization.create_trimesh_collision()
	
	#Set the material for the mesh
	visualization.material_override = hex_shader_material

The function _triangulate_hex is too complex to put in this forum post, but the entirety of my code is viewable on Github at the following repository: GitHub - davepruitt/hex_map_godot: Hexagonal-based maps in Godot

However, if we drill down deep enough into _triangulate_hex, eventually all vertices are added to the hex’s mesh using the following function:

func _add_triangle (st: SurfaceTool, v1: Vector3, v2: Vector3, v3: Vector3, c1: Color, c2: Color, c3: Color) -> void:
	#Set the color for the vertex, and then add the vertex
	st.set_color(c1)
	st.add_vertex(v1)
	
	#Set the color for the vertex, and then add the vertex
	st.set_color(c2)
	st.add_vertex(v2)
	
	#Set the color for the vertex, and then add the vertex
	st.set_color(c3)
	st.add_vertex(v3)

The hex_shader_material that is used is a very simple ShaderMaterial object. The shader itself looks like this right now:

shader_type spatial;

void vertex() {
	// Called for every vertex the material is visible on.
}

void fragment() {
	ALBEDO = vec3(COLOR.r, COLOR.g, COLOR.b);
}

I believe that should be all the most pertinent pieces of information and code, but once again, all of my code is viewable on Github, and I have followed the catlikecoding tutorials very closely if you are already familiar with those tutorials.

Any ideas on what is going on with my lighting/shading? Any ideas on how to fix it?

Thanks for any help you can provide!!!