From 53210af9660d90774b981fe00b616ec53fb72f1b Mon Sep 17 00:00:00 2001
From: Lucas Fryzek <lucas.fryzek@fryzekconcepts.com>
Date: Tue, 12 Sep 2023 07:43:44 -0400
Subject: Try to smooth normals

Something still seems off
---
 scripts/level_gen.gd | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 52 insertions(+), 1 deletion(-)

(limited to 'scripts/level_gen.gd')

diff --git a/scripts/level_gen.gd b/scripts/level_gen.gd
index ea636f8..91a4813 100644
--- a/scripts/level_gen.gd
+++ b/scripts/level_gen.gd
@@ -35,6 +35,28 @@ func gen_map_grid():
 			for y in gen_h:
 				map_grid[z*height*width + y*width + x] = -1.0
 
+func add_normal(p: Vector3, tri_index: int, triangles: PackedInt32Array, vertices: PackedVector3Array, normal_list: Array[Vector4]):
+	var new_tri_index = 0
+	while new_tri_index < len(triangles):
+		if floor(new_tri_index/3) == floor(tri_index/3):
+			new_tri_index += 3
+			continue
+			
+		var orig_vert = vertices[triangles[tri_index]]
+		var verts = [
+			new_tri_index+0,
+			new_tri_index+1,
+			new_tri_index+2]
+		
+		for i in verts:
+			var vert = vertices[triangles[i]]
+			if i == tri_index:
+				continue
+			if vert == orig_vert:
+				normal_list[triangles[tri_index]] += normal_list[triangles[i]]
+				
+		new_tri_index += 3
+
 # Called when the node enters the scene tree for the first time.
 func _ready():
 	gen_map_grid()
@@ -72,8 +94,37 @@ func _ready():
 						cell.value[i] = map_grid_get(grid[i][0], grid[i][1], grid[i][2])
 					cell.position[i] = Vector3(grid[i][0]*scale_x, grid[i][1]*scale_y, grid[i][2]*scale_z)
 				
-				MarchingCubes.march_cube(cell, triangles, vertices, normals)
+				MarchingCubes.march_cube(cell, triangles, vertices)
 			
+			
+	var tri_index = 0
+	var normal_list: Array[Vector4] = []
+	normal_list.resize(len(vertices))
+	normal_list.fill(Vector4(0,0,0,0))
+	while tri_index < len(triangles):
+		var p1 = vertices[triangles[tri_index + 0]]
+		var p2 = vertices[triangles[tri_index + 1]]
+		var p3 = vertices[triangles[tri_index + 2]]
+		var normal = (p2 - p1).cross(p3 - p1).normalized();
+		var normal_4 = Vector4(normal.x, normal.y, normal.z, 1)
+		normal_list[triangles[tri_index + 0]] += normal_4
+		normal_list[triangles[tri_index + 1]] += normal_4
+		normal_list[triangles[tri_index + 2]] += normal_4
+		tri_index += 3
+		
+	tri_index = 0
+	while tri_index < len(triangles):
+		var p1 = vertices[triangles[tri_index + 0]]
+		var p2 = vertices[triangles[tri_index + 1]]
+		var p3 = vertices[triangles[tri_index + 2]]
+		add_normal(p1, tri_index+0, triangles, vertices, normal_list)
+		add_normal(p2, tri_index+1, triangles, vertices, normal_list)
+		add_normal(p3, tri_index+2, triangles, vertices, normal_list)
+		tri_index += 3
+		
+	for normal in normal_list:
+		var real_normal = Vector3(normal.x, normal.y, normal.z) / normal.w
+		normals.push_back(real_normal)
 	# Create the Mesh
 	print("Lengths are ", len(vertices), " ", len(normals))
 	arr_mesh.add_surface_from_arrays(Mesh.PRIMITIVE_TRIANGLES, arrays)
-- 
cgit