Move triangle utils from "minetest" to "vector"

minetest.lua

@@ -263,42 +263,6 @@ function get_liquid_flow_direction(pos)
     return dir
 end
 
---+ Möller-Trumbore
-function ray_triangle_intersection(origin, direction, triangle)
-    local point_1, point_2, point_3 = unpack(triangle)
-    local edge_1, edge_2 = vector.subtract(point_2, point_1), vector.subtract(point_3, point_1)
-    local h = vector.cross(direction, edge_2)
-    local a = vector.dot(edge_1, h)
-    if math.abs(a) < 1e-9 then
-        return
-    end
-    local f = 1 / a
-    local diff = vector.subtract(origin, point_1)
-    local u = f * vector.dot(diff, h)
-    if u < 0 or u > 1 then
-        return
-    end
-    local q = vector.cross(diff, edge_1)
-    local v = f * vector.dot(direction, q)
-    if v < 0 or u + v > 1 then
-        return
-    end
-    local pos_on_line = f * vector.dot(edge_2, q);
-    if pos_on_line >= 0 then
-        return pos_on_line
-    end
-end
-
-function triangle_normal(triangle)
-    local point_1, point_2, point_3 = unpack(triangle)
-    local edge_1, edge_2 = vector.subtract(point_2, point_1), vector.subtract(point_3, point_1)
-    return vector.normalize{
-        x = edge_1.y * edge_2.z - edge_1.z * edge_2.y,
-        y = edge_1.z * edge_2.x - edge_1.x * edge_2.z,
-        z = edge_1.x * edge_2.y - edge_1.y * edge_2.x
-    }
-end
-
 --+ Raycast wrapper with proper flowingliquid intersections
 function raycast(pos1, pos2, objects, liquids)
     local raycast = minetest.raycast(pos1, pos2, objects, liquids)
@@ -415,10 +379,10 @@ function raycast(pos1, pos2, objects, liquids)
                 {corner_levels[1], corner_levels[2], corner_levels[3]},
                 {corner_levels[1], corner_levels[3], corner_levels[4]}
             } do
-                local pos_on_ray = ray_triangle_intersection(relative, direction, triangle)
+                local pos_on_ray = modlib.vector.ray_triangle_intersection(relative, direction, triangle)
                 if pos_on_ray and pos_on_ray <= length then
                     pointed_thing.intersection_point = vector.add(pos1, vector.multiply(direction, pos_on_ray))
-                    pointed_thing.intersection_normal = vector.multiply(triangle_normal(triangle), -1)
+                    pointed_thing.intersection_normal = vector.multiply(modlib.vector.triangle_normal(triangle), -1)
                     return pointed_thing
                 end
             end

vector.lua

@@ -85,4 +85,40 @@ function box_box_collision(diff, box, other_box)
         end
     end
     return true
+end
+
+--+ Möller-Trumbore
+function ray_triangle_intersection(origin, direction, triangle)
+    local point_1, point_2, point_3 = unpack(triangle)
+    local edge_1, edge_2 = vector.subtract(point_2, point_1), vector.subtract(point_3, point_1)
+    local h = vector.cross(direction, edge_2)
+    local a = vector.dot(edge_1, h)
+    if math.abs(a) < 1e-9 then
+        return
+    end
+    local f = 1 / a
+    local diff = vector.subtract(origin, point_1)
+    local u = f * vector.dot(diff, h)
+    if u < 0 or u > 1 then
+        return
+    end
+    local q = vector.cross(diff, edge_1)
+    local v = f * vector.dot(direction, q)
+    if v < 0 or u + v > 1 then
+        return
+    end
+    local pos_on_line = f * vector.dot(edge_2, q);
+    if pos_on_line >= 0 then
+        return pos_on_line
+    end
+end
+
+function triangle_normal(triangle)
+    local point_1, point_2, point_3 = unpack(triangle)
+    local edge_1, edge_2 = vector.subtract(point_2, point_1), vector.subtract(point_3, point_1)
+    return vector.normalize{
+        x = edge_1.y * edge_2.z - edge_1.z * edge_2.y,
+        y = edge_1.z * edge_2.x - edge_1.x * edge_2.z,
+        z = edge_1.x * edge_2.y - edge_1.y * edge_2.x
+    }
 end