From 3e9eb08c2426c75ab0f3d1c95de6df156827e4c2 Mon Sep 17 00:00:00 2001
From: DustyDave961 <144002335+DustyDave961@users.noreply.github.com>
Date: Sat, 28 Sep 2024 00:45:09 -0500
Subject: [PATCH 01/18] Update radiation.lua

Api added with the help of Copilot AI.
---
 technic/radiation.lua | 103 +++++++++++++++++++++++++++++-------------
 1 file changed, 72 insertions(+), 31 deletions(-)

diff --git a/technic/radiation.lua b/technic/radiation.lua
index 7092b697..8aad85c7 100644
--- a/technic/radiation.lua
+++ b/technic/radiation.lua
@@ -28,9 +28,26 @@ or complex internal structure should show no radiation resistance.
 Fractional resistance values are permitted.
 --]]
 
+local rad_resistance_node = {}
+local rad_resistance_group = {}
+local cache_radiation_resistance = {}
+
+-- Function to register node-specific resistance
+function technic.register_rad_resistance(node_name, resistance)
+    rad_resistance_node[node_name] = resistance
+    cache_radiation_resistance[node_name] = nil -- Invalidate cache
+end
+
+-- Function to register multiple node resistances at once
+function technic.register_multiple_resistances(resistances)
+    for node_name, resistance in pairs(resistances) do
+        technic.register_rad_resistance(node_name, resistance)
+    end
+end
+
 local S = technic.getter
 
-local rad_resistance_node = {
+local node_resistances = {
 	["default:brick"] = 13,
 	["default:bronzeblock"] = 45,
 	["default:clay"] = 15,
@@ -165,38 +182,62 @@ local rad_resistance_node = {
 	["tnt:tnt"] = 11,
 	["tnt:tnt_burning"] = 11,
 }
-local rad_resistance_group = {
-	concrete = 16,
-	tree = 3.4,
-	uranium_block = 500,
-	wood = 1.7,
-}
-local cache_radiation_resistance = {}
-local function node_radiation_resistance(node_name)
-	local resistance = cache_radiation_resistance[node_name]
-	if resistance then
-		return resistance
-	end
-	local def = minetest.registered_nodes[node_name]
-	if not def then
-		cache_radiation_resistance[node_name] = 0
-		return 0
-	end
-	resistance = def.radiation_resistance or
-			rad_resistance_node[node_name]
-	if not resistance then
-		resistance = 0
-		for g, v in pairs(def.groups) do
-			if v > 0 and rad_resistance_group[g] then
-				resistance = resistance + rad_resistance_group[g]
-			end
-		end
-	end
-	resistance = math.sqrt(resistance)
-	cache_radiation_resistance[node_name] = resistance
-	return resistance
+
+-- Register all node resistances at once
+technic.register_multiple_resistances(node_resistances)
+
+-- Function to register group-specific resistance
+function technic.register_group_resistance(group_name, resistance)
+    rad_resistance_group[group_name] = resistance
+    -- Invalidate cache for all nodes in this group
+    for node_name, def in pairs(minetest.registered_nodes) do
+        if def.groups[group_name] then
+            cache_radiation_resistance[node_name] = nil
+        end
+    end
 end
 
+technic.register_group_resistance("concrete", 16)
+technic.register_group_resistance("tree", 3.4)
+technic.register_group_resistance("uranium_block", 500)
+technic.register_group_resistance("wood", 1.7)
+
+-- Function to calculate radiation resistance
+function node_radiation_resistance(node_name)
+    local resistance = cache_radiation_resistance[node_name]
+    if resistance then
+        return resistance
+    end
+    local def = minetest.registered_nodes[node_name]
+    if not def then
+        cache_radiation_resistance[node_name] = 0
+        return 0
+    end
+
+    -- Check for rad_resistance group in node definition
+    resistance = 0
+    for g, v in pairs(def.groups) do
+        if g == "rad_resistance" then
+            resistance = resistance + v
+        end
+    end
+
+    -- If no rad_resistance group, use registered node-specific resistance
+    if resistance == 0 then
+        resistance = rad_resistance_node[node_name] or 0
+    end
+
+    -- Add group-specific resistance if applicable
+    for g, v in pairs(def.groups) do
+        if v > 0 and rad_resistance_group[g] then
+            resistance = resistance + rad_resistance_group[g]
+        end
+    end
+
+    resistance = math.sqrt(resistance)
+    cache_radiation_resistance[node_name] = resistance
+    return resistance
+end
 
 --[[
 Radioactive nodes cause damage to nearby players.  The damage

From b9de49b1f89b8bb63782f62c022747d33cd30a07 Mon Sep 17 00:00:00 2001
From: DustyDave961 <144002335+DustyDave961@users.noreply.github.com>
Date: Sat, 28 Sep 2024 01:03:57 -0500
Subject: [PATCH 02/18] Update nodes.lua

"rad_resistance" group added to lead block node definitions. Playtesting required.
---
 technic_worldgen/nodes.lua | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/technic_worldgen/nodes.lua b/technic_worldgen/nodes.lua
index 90888e43..d7c1bab0 100644
--- a/technic_worldgen/nodes.lua
+++ b/technic_worldgen/nodes.lua
@@ -106,7 +106,7 @@ minetest.register_node(":technic:lead_block", {
 	description = S("Lead Block"),
 	tiles = { "technic_lead_block.png" },
 	is_ground_content = true,
-	groups = {cracky=1, level=2},
+	groups = {cracky=1, level=2, rad_resistance=80},
 	sounds = default.node_sound_stone_defaults()
 })
 

From 174ba17d6965ae32e56565076a7cd21f6813002b Mon Sep 17 00:00:00 2001
From: DustyDave961 <144002335+DustyDave961@users.noreply.github.com>
Date: Sat, 28 Sep 2024 01:06:05 -0500
Subject: [PATCH 03/18] Update radiation.lua

Lead block removed from node_resistances table.
---
 technic/radiation.lua | 1 -
 1 file changed, 1 deletion(-)

diff --git a/technic/radiation.lua b/technic/radiation.lua
index 8aad85c7..3e38e864 100644
--- a/technic/radiation.lua
+++ b/technic/radiation.lua
@@ -171,7 +171,6 @@ local node_resistances = {
 	["technic:corium_flowing"] = 40,
 	["technic:corium_source"] = 80,
 	["technic:granite"] = 18,
-	["technic:lead_block"] = 80,
 	["technic:marble"] = 18,
 	["technic:marble_bricks"] = 18,
 	["technic:mineral_chromium"] = 19,

From 268d7bc22aef30ce4f100838246d375c7fdc00c1 Mon Sep 17 00:00:00 2001
From: DustyDave961 <144002335+DustyDave961@users.noreply.github.com>
Date: Sun, 13 Oct 2024 19:48:19 -0500
Subject: [PATCH 04/18] Update radiation.lua

Greater than or equal to 0 because negative makes no sense.
---
 technic/radiation.lua | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/technic/radiation.lua b/technic/radiation.lua
index 3e38e864..f712bc0b 100644
--- a/technic/radiation.lua
+++ b/technic/radiation.lua
@@ -222,7 +222,7 @@ function node_radiation_resistance(node_name)
     end
 
     -- If no rad_resistance group, use registered node-specific resistance
-    if resistance == 0 then
+    if resistance >= 0 then
         resistance = rad_resistance_node[node_name] or 0
     end
 

From 930efcc51cd294a8c1b935b501b1212246fcfdf5 Mon Sep 17 00:00:00 2001
From: DustyDave961 <144002335+DustyDave961@users.noreply.github.com>
Date: Tue, 15 Oct 2024 17:57:02 -0500
Subject: [PATCH 05/18] Update api.md

The technic.register_rad_resistance function added
---
 technic/doc/api.md | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/technic/doc/api.md b/technic/doc/api.md
index c8d22d32..7116f0ab 100644
--- a/technic/doc/api.md
+++ b/technic/doc/api.md
@@ -145,6 +145,10 @@ Unsorted functions:
 	* Some configuration function
 * `technic.tube_inject_item(pos, start_pos, velocity, item)`
 	* Same as `pipeworks.tube_inject_item`
+* `technic.register_rad_resistance(node_name, resistance)`
+	* Sets the radiation resistance of the given node.
+	* `node_name`: name of the node
+	* `resistance`: number, radiation resistance of the node
 
 ### Energy modifiers
 * `technic.set_RE_wear(itemstack, item_load, max_charge)`
@@ -193,6 +197,9 @@ Groups:
 	* UNRELIABLE. Indicates whether the item or node belongs to technic
 * `connect_sides = {"top", "left", ...}`
 	* Extends the Minetest API. Indicates where the machine can be connected.
+* `radioactive = <radiation>`
+	* Makes the node radioactive.
+ 	* `<radiation>`: Strength of the node's radiation (ex. `80`).
 
 Additional definition fields:
 

From cedccb4401c555537e02e48f85270fb84cb5b233 Mon Sep 17 00:00:00 2001
From: DustyDave961 <144002335+DustyDave961@users.noreply.github.com>
Date: Tue, 15 Oct 2024 18:05:10 -0500
Subject: [PATCH 06/18] Update radiation.lua

Unnecessary function removed.
---
 technic/radiation.lua | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/technic/radiation.lua b/technic/radiation.lua
index f712bc0b..93d07c79 100644
--- a/technic/radiation.lua
+++ b/technic/radiation.lua
@@ -38,13 +38,6 @@ function technic.register_rad_resistance(node_name, resistance)
     cache_radiation_resistance[node_name] = nil -- Invalidate cache
 end
 
--- Function to register multiple node resistances at once
-function technic.register_multiple_resistances(resistances)
-    for node_name, resistance in pairs(resistances) do
-        technic.register_rad_resistance(node_name, resistance)
-    end
-end
-
 local S = technic.getter
 
 local node_resistances = {
@@ -183,7 +176,9 @@ local node_resistances = {
 }
 
 -- Register all node resistances at once
-technic.register_multiple_resistances(node_resistances)
+for node_name, resistance in pairs(node_resistances) do
+    technic.register_rad_resistance(node_name, resistance)
+end
 
 -- Function to register group-specific resistance
 function technic.register_group_resistance(group_name, resistance)

From 2309259f6403ba0d4581372d95790f1458c8b96c Mon Sep 17 00:00:00 2001
From: DustyDave961 <144002335+DustyDave961@users.noreply.github.com>
Date: Tue, 15 Oct 2024 18:16:14 -0500
Subject: [PATCH 07/18] Update radiation.lua

Spaces bothered me.
---
 technic/radiation.lua | 86 +++++++++++++++++++++----------------------
 1 file changed, 43 insertions(+), 43 deletions(-)

diff --git a/technic/radiation.lua b/technic/radiation.lua
index 93d07c79..bae580ad 100644
--- a/technic/radiation.lua
+++ b/technic/radiation.lua
@@ -34,8 +34,8 @@ local cache_radiation_resistance = {}
 
 -- Function to register node-specific resistance
 function technic.register_rad_resistance(node_name, resistance)
-    rad_resistance_node[node_name] = resistance
-    cache_radiation_resistance[node_name] = nil -- Invalidate cache
+	rad_resistance_node[node_name] = resistance
+	cache_radiation_resistance[node_name] = nil -- Invalidate cache
 end
 
 local S = technic.getter
@@ -177,18 +177,18 @@ local node_resistances = {
 
 -- Register all node resistances at once
 for node_name, resistance in pairs(node_resistances) do
-    technic.register_rad_resistance(node_name, resistance)
+	technic.register_rad_resistance(node_name, resistance)
 end
 
 -- Function to register group-specific resistance
 function technic.register_group_resistance(group_name, resistance)
-    rad_resistance_group[group_name] = resistance
-    -- Invalidate cache for all nodes in this group
-    for node_name, def in pairs(minetest.registered_nodes) do
-        if def.groups[group_name] then
-            cache_radiation_resistance[node_name] = nil
-        end
-    end
+	rad_resistance_group[group_name] = resistance
+	-- Invalidate cache for all nodes in this group
+	for node_name, def in pairs(minetest.registered_nodes) do
+		if def.groups[group_name] then
+			cache_radiation_resistance[node_name] = nil
+		end
+	end
 end
 
 technic.register_group_resistance("concrete", 16)
@@ -198,39 +198,39 @@ technic.register_group_resistance("wood", 1.7)
 
 -- Function to calculate radiation resistance
 function node_radiation_resistance(node_name)
-    local resistance = cache_radiation_resistance[node_name]
-    if resistance then
-        return resistance
-    end
-    local def = minetest.registered_nodes[node_name]
-    if not def then
-        cache_radiation_resistance[node_name] = 0
-        return 0
-    end
-
-    -- Check for rad_resistance group in node definition
-    resistance = 0
-    for g, v in pairs(def.groups) do
-        if g == "rad_resistance" then
-            resistance = resistance + v
-        end
-    end
-
-    -- If no rad_resistance group, use registered node-specific resistance
-    if resistance >= 0 then
-        resistance = rad_resistance_node[node_name] or 0
-    end
-
-    -- Add group-specific resistance if applicable
-    for g, v in pairs(def.groups) do
-        if v > 0 and rad_resistance_group[g] then
-            resistance = resistance + rad_resistance_group[g]
-        end
-    end
-
-    resistance = math.sqrt(resistance)
-    cache_radiation_resistance[node_name] = resistance
-    return resistance
+	local resistance = cache_radiation_resistance[node_name]
+	if resistance then
+		return resistance
+	end
+	local def = minetest.registered_nodes[node_name]
+	if not def then
+		cache_radiation_resistance[node_name] = 0
+		return 0
+	end
+	
+	-- Check for rad_resistance group in node definition
+	resistance = 0
+	for g, v in pairs(def.groups) do
+		if g == "rad_resistance" then
+			resistance = resistance + v
+		end
+	end
+
+	-- If no rad_resistance group, use registered node-specific resistance
+	if resistance >= 0 then
+		resistance = rad_resistance_node[node_name] or 0
+	end
+
+	-- Add group-specific resistance if applicable
+	for g, v in pairs(def.groups) do
+		if v > 0 and rad_resistance_group[g] then
+			resistance = resistance + rad_resistance_group[g]
+		end
+	end
+
+	resistance = math.sqrt(resistance)
+	cache_radiation_resistance[node_name] = resistance
+	return resistance
 end
 
 --[[

From 11f982acd67ac45b0ade92fedfa90aa90394052e Mon Sep 17 00:00:00 2001
From: DustyDave961 <144002335+DustyDave961@users.noreply.github.com>
Date: Tue, 15 Oct 2024 18:17:33 -0500
Subject: [PATCH 08/18] Update radiation.lua

The node_radiation_resistance function is only used locally.
---
 technic/radiation.lua | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/technic/radiation.lua b/technic/radiation.lua
index bae580ad..2dc1a307 100644
--- a/technic/radiation.lua
+++ b/technic/radiation.lua
@@ -197,7 +197,7 @@ technic.register_group_resistance("uranium_block", 500)
 technic.register_group_resistance("wood", 1.7)
 
 -- Function to calculate radiation resistance
-function node_radiation_resistance(node_name)
+local function node_radiation_resistance(node_name)
 	local resistance = cache_radiation_resistance[node_name]
 	if resistance then
 		return resistance

From 0cf8159a1480bb817f44b7f5c34463be6afeafbd Mon Sep 17 00:00:00 2001
From: DustyDave961 <144002335+DustyDave961@users.noreply.github.com>
Date: Wed, 16 Oct 2024 17:33:30 -0500
Subject: [PATCH 09/18] Update api.md

Documented rad_resistance group.
---
 technic/doc/api.md | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/technic/doc/api.md b/technic/doc/api.md
index 7116f0ab..1c731ee3 100644
--- a/technic/doc/api.md
+++ b/technic/doc/api.md
@@ -199,7 +199,10 @@ Groups:
 	* Extends the Minetest API. Indicates where the machine can be connected.
 * `radioactive = <radiation>`
 	* Makes the node radioactive.
- 	* `<radiation>`: Strength of the node's radiation (ex. `80`).
+ 	* `<radiation>`: Strength of the node's radiation (ex. `2`).
+* `rad_resistance = <resistance>`
+	* Makes the node resistant to radiation.
+	* `<resistance>`: Strength of the node's resistance (ex. `80`).
 
 Additional definition fields:
 

From a9e135118107fc826ab4f444e14d09809d1b818e Mon Sep 17 00:00:00 2001
From: DustyDave961 <144002335+DustyDave961@users.noreply.github.com>
Date: Thu, 17 Oct 2024 00:52:07 -0500
Subject: [PATCH 10/18] Update radiation.lua

I guess we only need the rad_resistance group?
---
 technic/radiation.lua | 56 ++++++++++++++-----------------------------
 1 file changed, 18 insertions(+), 38 deletions(-)

diff --git a/technic/radiation.lua b/technic/radiation.lua
index 2dc1a307..6a3b680a 100644
--- a/technic/radiation.lua
+++ b/technic/radiation.lua
@@ -28,14 +28,15 @@ or complex internal structure should show no radiation resistance.
 Fractional resistance values are permitted.
 --]]
 
-local rad_resistance_node = {}
-local rad_resistance_group = {}
-local cache_radiation_resistance = {}
-
 -- Function to register node-specific resistance
 function technic.register_rad_resistance(node_name, resistance)
-	rad_resistance_node[node_name] = resistance
-	cache_radiation_resistance[node_name] = nil -- Invalidate cache
+	local node = minetest.registered_nodes[node_name]
+	if node then
+		if not node.groups then
+			node.groups = {}
+		end
+        node.groups.rad_resistance = resistance
+	end
 end
 
 local S = technic.getter
@@ -182,11 +183,11 @@ end
 
 -- Function to register group-specific resistance
 function technic.register_group_resistance(group_name, resistance)
-	rad_resistance_group[group_name] = resistance
-	-- Invalidate cache for all nodes in this group
-	for node_name, def in pairs(minetest.registered_nodes) do
-		if def.groups[group_name] then
-			cache_radiation_resistance[node_name] = nil
+	for node_name, node_def in pairs(minetest.registered_nodes) do
+		if node_def.groups[group_name] then
+			if not node_def.groups.rad_resistance then
+				node_def.groups.rad_resistance = resistance
+			end
 		end
 	end
 end
@@ -198,39 +199,18 @@ technic.register_group_resistance("wood", 1.7)
 
 -- Function to calculate radiation resistance
 local function node_radiation_resistance(node_name)
-	local resistance = cache_radiation_resistance[node_name]
-	if resistance then
-		return resistance
-	end
 	local def = minetest.registered_nodes[node_name]
 	if not def then
-		cache_radiation_resistance[node_name] = 0
 		return 0
 	end
-	
-	-- Check for rad_resistance group in node definition
-	resistance = 0
-	for g, v in pairs(def.groups) do
-		if g == "rad_resistance" then
-			resistance = resistance + v
-		end
-	end
 
-	-- If no rad_resistance group, use registered node-specific resistance
-	if resistance >= 0 then
-		resistance = rad_resistance_node[node_name] or 0
+	local resistance = 0
+	-- Add rad_resistance group value if it exists
+	if def.groups.rad_resistance then
+		resistance = resistance + def.groups.rad_resistance
 	end
-
-	-- Add group-specific resistance if applicable
-	for g, v in pairs(def.groups) do
-		if v > 0 and rad_resistance_group[g] then
-			resistance = resistance + rad_resistance_group[g]
-		end
-	end
-
-	resistance = math.sqrt(resistance)
-	cache_radiation_resistance[node_name] = resistance
-	return resistance
+    
+	return math.sqrt(resistance)
 end
 
 --[[

From 9eb7d0e7843f27cc9ddc818503fc8a0e32be150f Mon Sep 17 00:00:00 2001
From: DustyDave961 <144002335+DustyDave961@users.noreply.github.com>
Date: Fri, 18 Oct 2024 05:40:45 -0500
Subject: [PATCH 11/18] Update radiation.lua

Space caused an error for some reason?
---
 technic/radiation.lua | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/technic/radiation.lua b/technic/radiation.lua
index 6a3b680a..d7ab44a6 100644
--- a/technic/radiation.lua
+++ b/technic/radiation.lua
@@ -209,7 +209,7 @@ local function node_radiation_resistance(node_name)
 	if def.groups.rad_resistance then
 		resistance = resistance + def.groups.rad_resistance
 	end
-    
+   
 	return math.sqrt(resistance)
 end
 

From 8ad1f58cd317c192bdf96370ae39b7681d6b024c Mon Sep 17 00:00:00 2001
From: DustyDave961 <144002335+DustyDave961@users.noreply.github.com>
Date: Sat, 19 Oct 2024 02:46:10 -0500
Subject: [PATCH 12/18] Update api.md

Documented technic.register_group_resistance function
---
 technic/doc/api.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/technic/doc/api.md b/technic/doc/api.md
index 1c731ee3..453f7c23 100644
--- a/technic/doc/api.md
+++ b/technic/doc/api.md
@@ -149,6 +149,10 @@ Unsorted functions:
 	* Sets the radiation resistance of the given node.
 	* `node_name`: name of the node
 	* `resistance`: number, radiation resistance of the node
+* `technic.register_group_resistance(group_name, resistance)`
+	* Sets the radiation resistance of the given group of nodes.
+	* `group_name`: name of the group
+	* `resistance`: number, radiation resistance of the group
 
 ### Energy modifiers
 * `technic.set_RE_wear(itemstack, item_load, max_charge)`

From 5b8e7fb472c91bab5bb1d20ebde37de7279e7827 Mon Sep 17 00:00:00 2001
From: DustyDave961 <144002335+DustyDave961@users.noreply.github.com>
Date: Sat, 19 Oct 2024 03:19:34 -0500
Subject: [PATCH 13/18] Update nodes.lua

Added rad_resistance group to resistant nodes.
---
 technic_worldgen/nodes.lua | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/technic_worldgen/nodes.lua b/technic_worldgen/nodes.lua
index d7c1bab0..336c65b8 100644
--- a/technic_worldgen/nodes.lua
+++ b/technic_worldgen/nodes.lua
@@ -5,7 +5,7 @@ minetest.register_node( ":technic:mineral_uranium", {
 	description = S("Uranium Ore"),
 	tiles = { "default_stone.png^technic_mineral_uranium.png" },
 	is_ground_content = true,
-	groups = {cracky=3, radioactive=1},
+	groups = {cracky=3, radioactive=1, rad_resistance=71},
 	sounds = default.node_sound_stone_defaults(),
 	drop = "technic:uranium_lump",
 })
@@ -14,7 +14,7 @@ minetest.register_node( ":technic:mineral_chromium", {
 	description = S("Chromium Ore"),
 	tiles = { "default_stone.png^technic_mineral_chromium.png" },
 	is_ground_content = true,
-	groups = {cracky=3},
+	groups = {cracky=3, rad_resistance=19},
 	sounds = default.node_sound_stone_defaults(),
 	drop = "technic:chromium_lump",
 })
@@ -23,7 +23,7 @@ minetest.register_node( ":technic:mineral_zinc", {
 	description = S("Zinc Ore"),
 	tiles = { "default_stone.png^technic_mineral_zinc.png" },
 	is_ground_content = true,
-	groups = {cracky=3},
+	groups = {cracky=3, rad_resistance=19},
 	sounds = default.node_sound_stone_defaults(),
 	drop = "technic:zinc_lump",
 })
@@ -50,7 +50,7 @@ minetest.register_node( ":technic:granite", {
 	description = S("Granite"),
 	tiles = { "technic_granite.png" },
 	is_ground_content = true,
-	groups = {cracky=1},
+	groups = {cracky=1, rad_resistance=18},
 	sounds = default.node_sound_stone_defaults(),
 })
 
@@ -58,7 +58,7 @@ minetest.register_node( ":technic:granite_bricks", {
 	description = S("Granite Bricks"),
 	tiles = { "technic_granite_bricks.png" },
 	is_ground_content = false,
-	groups = {cracky=1},
+	groups = {cracky=1, rad_resistance=18},
 	sounds = default.node_sound_stone_defaults(),
 })
 
@@ -66,7 +66,7 @@ minetest.register_node( ":technic:marble", {
 	description = S("Marble"),
 	tiles = { "technic_marble.png" },
 	is_ground_content = true,
-	groups = {cracky=3, marble=1},
+	groups = {cracky=3, marble=1, rad_resistance=18},
 	sounds = default.node_sound_stone_defaults(),
 })
 
@@ -74,7 +74,7 @@ minetest.register_node( ":technic:marble_bricks", {
 	description = S("Marble Bricks"),
 	tiles = { "technic_marble_bricks.png" },
 	is_ground_content = false,
-	groups = {cracky=3},
+	groups = {cracky=3, rad_resistance=18},
 	sounds = default.node_sound_stone_defaults(),
 })
 
@@ -90,7 +90,7 @@ minetest.register_node(":technic:chromium_block", {
 	description = S("Chromium Block"),
 	tiles = { "technic_chromium_block.png" },
 	is_ground_content = true,
-	groups = {cracky=1, level=2},
+	groups = {cracky=1, level=2, rad_resistance=37},
 	sounds = default.node_sound_stone_defaults()
 })
 
@@ -98,7 +98,7 @@ minetest.register_node(":technic:zinc_block", {
 	description = S("Zinc Block"),
 	tiles = { "technic_zinc_block.png" },
 	is_ground_content = true,
-	groups = {cracky=1, level=2},
+	groups = {cracky=1, level=2, rad_resistance=36},
 	sounds = default.node_sound_stone_defaults()
 })
 
@@ -121,7 +121,7 @@ minetest.register_node(":technic:cast_iron_block", {
 	description = S("Cast Iron Block"),
 	tiles = { "technic_cast_iron_block.png" },
 	is_ground_content = true,
-	groups = {cracky=1, level=2},
+	groups = {cracky=1, level=2, rad_resistance=40},
 	sounds = default.node_sound_stone_defaults()
 })
 
@@ -129,7 +129,7 @@ minetest.register_node(":technic:carbon_steel_block", {
 	description = S("Carbon Steel Block"),
 	tiles = { "technic_carbon_steel_block.png" },
 	is_ground_content = true,
-	groups = {cracky=1, level=2},
+	groups = {cracky=1, level=2, rad_resistance=40},
 	sounds = default.node_sound_stone_defaults()
 })
 
@@ -137,7 +137,7 @@ minetest.register_node(":technic:stainless_steel_block", {
 	description = S("Stainless Steel Block"),
 	tiles = { "technic_stainless_steel_block.png" },
 	is_ground_content = true,
-	groups = {cracky=1, level=2},
+	groups = {cracky=1, level=2, rad_resistance=40},
 	sounds = default.node_sound_stone_defaults()
 })
 

From 60b22e3c3a9a6b6f2141142511235ebc3495b782 Mon Sep 17 00:00:00 2001
From: DustyDave961 <144002335+DustyDave961@users.noreply.github.com>
Date: Sat, 19 Oct 2024 03:20:19 -0500
Subject: [PATCH 14/18] Update radiation.lua

Technic specific node resistances moved to node definitions.
---
 technic/radiation.lua | 14 +-------------
 1 file changed, 1 insertion(+), 13 deletions(-)

diff --git a/technic/radiation.lua b/technic/radiation.lua
index d7ab44a6..30365362 100644
--- a/technic/radiation.lua
+++ b/technic/radiation.lua
@@ -158,20 +158,8 @@ local node_resistances = {
 	["moreores:silver_block"] = 53,
 	["snow:snow_brick"] = 2.8,
 	["basic_materials:brass_block"] = 43,
-	["technic:carbon_steel_block"] = 40,
-	["technic:cast_iron_block"] = 40,
-	["technic:chernobylite_block"] = 40,
-	["technic:chromium_block"] = 37,
 	["technic:corium_flowing"] = 40,
 	["technic:corium_source"] = 80,
-	["technic:granite"] = 18,
-	["technic:marble"] = 18,
-	["technic:marble_bricks"] = 18,
-	["technic:mineral_chromium"] = 19,
-	["technic:mineral_uranium"] = 71,
-	["technic:mineral_zinc"] = 19,
-	["technic:stainless_steel_block"] = 40,
-	["technic:zinc_block"] = 36,
 	["tnt:tnt"] = 11,
 	["tnt:tnt_burning"] = 11,
 }
@@ -471,7 +459,7 @@ minetest.register_node("technic:chernobylite_block", {
         description = S("Chernobylite Block"),
 	tiles = {"technic_chernobylite_block.png"},
 	is_ground_content = true,
-	groups = {cracky=1, radioactive=4, level=2},
+	groups = {cracky=1, radioactive=4, level=2, rad_resistance=40},
 	sounds = default.node_sound_stone_defaults(),
 	light_source = 2,
 })

From f9026bfacf2651c2d112cdf8bb6b1914c253fc5b Mon Sep 17 00:00:00 2001
From: DustyDave961 <144002335+DustyDave961@users.noreply.github.com>
Date: Sat, 19 Oct 2024 06:59:22 -0500
Subject: [PATCH 15/18] Update radiation.lua

Why is whitespace such an issue? There's nothing there.
---
 technic/radiation.lua | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/technic/radiation.lua b/technic/radiation.lua
index 30365362..59e55754 100644
--- a/technic/radiation.lua
+++ b/technic/radiation.lua
@@ -197,7 +197,7 @@ local function node_radiation_resistance(node_name)
 	if def.groups.rad_resistance then
 		resistance = resistance + def.groups.rad_resistance
 	end
-   
+	
 	return math.sqrt(resistance)
 end
 

From af6ab2899e8f6aae38308da230647941e9dd1c14 Mon Sep 17 00:00:00 2001
From: DustyDave961 <144002335+DustyDave961@users.noreply.github.com>
Date: Sun, 20 Oct 2024 08:00:11 -0500
Subject: [PATCH 16/18] Update radiation.lua

I thought I removed the white space already...
---
 technic/radiation.lua | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/technic/radiation.lua b/technic/radiation.lua
index 59e55754..55860c48 100644
--- a/technic/radiation.lua
+++ b/technic/radiation.lua
@@ -197,7 +197,7 @@ local function node_radiation_resistance(node_name)
 	if def.groups.rad_resistance then
 		resistance = resistance + def.groups.rad_resistance
 	end
-	
+
 	return math.sqrt(resistance)
 end
 

From cf01860727614f49bbdf073b4ba055016ef45165 Mon Sep 17 00:00:00 2001
From: DustyDave961 <144002335+DustyDave961@users.noreply.github.com>
Date: Sun, 20 Oct 2024 10:16:13 -0500
Subject: [PATCH 17/18] Update radiation.lua

I think this will work?
---
 technic/radiation.lua | 30 +++++++++++++++++++-----------
 1 file changed, 19 insertions(+), 11 deletions(-)

diff --git a/technic/radiation.lua b/technic/radiation.lua
index 55860c48..9d0cede0 100644
--- a/technic/radiation.lua
+++ b/technic/radiation.lua
@@ -185,22 +185,30 @@ technic.register_group_resistance("tree", 3.4)
 technic.register_group_resistance("uranium_block", 500)
 technic.register_group_resistance("wood", 1.7)
 
--- Function to calculate radiation resistance
-local function node_radiation_resistance(node_name)
-	local def = minetest.registered_nodes[node_name]
-	if not def then
-		return 0
-	end
+technic.resistance_cache = {}
 
-	local resistance = 0
-	-- Add rad_resistance group value if it exists
-	if def.groups.rad_resistance then
-		resistance = resistance + def.groups.rad_resistance
+function technic.cache_resistances()
+	for node_name, node_def in pairs(minetest.registered_nodes) do
+		local resistance = 0
+		if node_def.groups and node_def.groups.rad_resistance then
+			resistance = node_def.groups.rad_resistance
+		end
+		technic.resistance_cache[node_name] = resistance
 	end
+end
 
-	return math.sqrt(resistance)
+local function node_radiation_resistance(node_name)
+	local cached_resistance = technic.resistance_cache[node_name]
+	if cached_resistance then
+		return math.sqrt(cached_resistance)
+	else
+		return 0
+	end
 end
 
+-- Initialize cache
+technic.cache_resistances()
+
 --[[
 Radioactive nodes cause damage to nearby players.  The damage
 effect depends on the intrinsic strength of the radiation source,

From feb853c715d856327c1931e6c93df507ef1cb64c Mon Sep 17 00:00:00 2001
From: DustyDave961 <144002335+DustyDave961@users.noreply.github.com>
Date: Sun, 20 Oct 2024 10:16:37 -0500
Subject: [PATCH 18/18] Update api.md

Radiation functions moved to Radiation section.
---
 technic/doc/api.md | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/technic/doc/api.md b/technic/doc/api.md
index 453f7c23..59bdee93 100644
--- a/technic/doc/api.md
+++ b/technic/doc/api.md
@@ -145,14 +145,6 @@ Unsorted functions:
 	* Some configuration function
 * `technic.tube_inject_item(pos, start_pos, velocity, item)`
 	* Same as `pipeworks.tube_inject_item`
-* `technic.register_rad_resistance(node_name, resistance)`
-	* Sets the radiation resistance of the given node.
-	* `node_name`: name of the node
-	* `resistance`: number, radiation resistance of the node
-* `technic.register_group_resistance(group_name, resistance)`
-	* Sets the radiation resistance of the given group of nodes.
-	* `group_name`: name of the group
-	* `resistance`: number, radiation resistance of the group
 
 ### Energy modifiers
 * `technic.set_RE_wear(itemstack, item_load, max_charge)`
@@ -280,6 +272,20 @@ Network functionality:
 5. If the total demand is more than the available power all RE nodes will be shut
    down. We have a brown-out situation.
 
+
+## Radiation
+* `technic.register_rad_resistance(node_name, resistance)`
+	* Sets the radiation resistance of the given node.
+	* `node_name`: name of the node
+	* `resistance`: number, radiation resistance of the node
+* `technic.register_group_resistance(group_name, resistance)`
+	* Sets the radiation resistance of the given group of nodes.
+	* `group_name`: name of the group
+	* `resistance`: number, radiation resistance of the group
+* `technic.cache_resistances()`
+	* Cache radiation resistances after Technic loads.
+
+
 ## Deprecated functions
 
 Following functions are either no longer used by technic, or are planned to