Specific resistance for energy shields

[darkfrei]

Hi! Is it possible to make specific resistances for energy shields like it specified by armor?

Power armor (part):

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data.raw.armor["power-armor-mk2"].resistances[1].type = "physical" 
data.raw.armor["power-armor-mk2"].resistances[1].decrease = 10 
data.raw.armor["power-armor-mk2"].resistances[1].percent = 40 
data.raw.armor["power-armor-mk2"].resistances[2].type = "acid" 
data.raw.armor["power-armor-mk2"].resistances[2].decrease = 10 
data.raw.armor["power-armor-mk2"].resistances[2].percent = 40 
data.raw.armor["power-armor-mk2"].resistances[3].type = "explosion" 
data.raw.armor["power-armor-mk2"].resistances[3].decrease = 60 
data.raw.armor["power-armor-mk2"].resistances[3].percent = 50 
data.raw.armor["power-armor-mk2"].resistances[4].type = "fire" 
data.raw.armor["power-armor-mk2"].resistances[4].decrease = 0
data.raw.armor["power-armor-mk2"].resistances[4].percent = 70 

Energy shield:

Code: Select all

data.raw["energy-shield-equipment"]["energy-shield-mk2-equipment"].type = "energy-shield-equipment" 
data.raw["energy-shield-equipment"]["energy-shield-mk2-equipment"].name = "energy-shield-mk2-equipment" 
data.raw["energy-shield-equipment"]["energy-shield-mk2-equipment"].sprite.filename = "__base__/graphics/equipment/energy-shield-mk2-equipment.png" 
data.raw["energy-shield-equipment"]["energy-shield-mk2-equipment"].sprite.width = 64 
data.raw["energy-shield-equipment"]["energy-shield-mk2-equipment"].sprite.height = 64 
data.raw["energy-shield-equipment"]["energy-shield-mk2-equipment"].sprite.priority = "medium" 
data.raw["energy-shield-equipment"]["energy-shield-mk2-equipment"].shape.width = 2 
data.raw["energy-shield-equipment"]["energy-shield-mk2-equipment"].shape.height = 2 
data.raw["energy-shield-equipment"]["energy-shield-mk2-equipment"].shape.type = "full" 
data.raw["energy-shield-equipment"]["energy-shield-mk2-equipment"].max_shield_value = 150 
data.raw["energy-shield-equipment"]["energy-shield-mk2-equipment"].energy_source.type = "electric" 
data.raw["energy-shield-equipment"]["energy-shield-mk2-equipment"].energy_source.buffer_capacity = "180kJ" 
data.raw["energy-shield-equipment"]["energy-shield-mk2-equipment"].energy_source.input_flow_limit = "360kW" 
data.raw["energy-shield-equipment"]["energy-shield-mk2-equipment"].energy_source.usage_priority = "primary-input" 
data.raw["energy-shield-equipment"]["energy-shield-mk2-equipment"].energy_per_shield = "30kJ" 
data.raw["energy-shield-equipment"]["energy-shield-mk2-equipment"].categories[1] = "armor"

Suggested prototype (parts):

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data.raw["energy-shield-equipment"]["physical-energy-shield-mk2-equipment"].resistances[1].type = "physical" 
data.raw["energy-shield-equipment"]["physical-energy-shield-mk2-equipment"].resistances[1].decrease = 10 
data.raw["energy-shield-equipment"]["physical-energy-shield-mk2-equipment"].resistances[1].percent = 40 

Code: Select all

data.raw["energy-shield-equipment"]["acid-energy-shield-mk2-equipment"].resistances[1].type = "acid" 
data.raw["energy-shield-equipment"]["acid-energy-shield-mk2-equipment"].resistances[1].decrease = 10 
data.raw["energy-shield-equipment"]["acid-energy-shield-mk2-equipment"].resistances[1].percent = 40 

Code: Select all

data.raw["energy-shield-equipment"]["explosion-energy-shield-mk2-equipment"].resistances[1].type = "explosion" 
data.raw["energy-shield-equipment"]["explosion-energy-shield-mk2-equipment"].resistances[1].decrease = 60
data.raw["energy-shield-equipment"]["explosion-energy-shield-mk2-equipment"].resistances[1].percent = 50

Code: Select all

data.raw["energy-shield-equipment"]["fire-energy-shield-mk2-equipment"].resistances[1].type = "fire" 
data.raw["energy-shield-equipment"]["fire-energy-shield-mk2-equipment"].resistances[1].decrease = 0
data.raw["energy-shield-equipment"]["fire-energy-shield-mk2-equipment"].resistances[1].percent = 70

So you can stack specific resistances together for specific situations. Now we have only max_shield_value = 150, but it doesn't defined the type of damage resistance.

[Arch666Angel]

+1

[eradicator]

How would you want that to work if the player has several different types of shield equipment? I.e. 6*Mk1, 4*Mk2?
Intuition can say either "average" or "maximum of each resitance" depending on what kind of game you played before.
(Or does factorio actually calculate shields one after another?)

[Rseding91]

How would you imagine having different shields with different resistances working when the game goes to apply damage to shields?

[darkfrei]

How would you imagine having different shields with different resistances working when the game goes to apply damage to shields?

The same way like now applied damage to health. But to shields. It can be also normal armor elements, like bomber suit or like by firefighters.

[darkfrei]

How would you want that to work if the player has several different types of shield equipment? I.e. 6*Mk1, 4*Mk2?

Multiplicative or not additive stacking: r = 1- (1-r_1)*(1-r_2)*(1-r_3)
If mk1 has 0.2 and mk2 has 0.4 resistance, than
2xMk1 = 0.36
1xMk1 + 1xMk2 = 0.52
2xMk2 = 0.64

6xMk1 = 0.74
4xMk2 = 0.87
6xMk1 + 4xMk2 = 0.97

[Rseding91]

How would you want that to work if the player has several different types of shield equipment? I.e. 6*Mk1, 4*Mk2?

Multiplicative or not additive stacking: r = 1- (1-r_1)*(1-r_2)*(1-r_3)
If mk1 has 0.2 and mk2 has 0.4 resistance, than
2xMk1 = 0.36
1xMk1 + 1xMk2 = 0.52
2xMk2 = 0.64

6xMk1 = 0.74
4xMk2 = 0.87
6xMk1 + 4xMk2 = 0.97

That's not how the game does resistances. Resistances are a per-entity thing - not a merged set of all resistances. In the character example the character has resistances, the armor has resistances and they're both calculated separately. first the armor then the character. If shields had resistances it would calculate them one at a time meaning having different resistances across different shields just wouldn't work.

[Arch666Angel]

How would you want that to work if the player has several different types of shield equipment? I.e. 6*Mk1, 4*Mk2?

Multiplicative or not additive stacking: r = 1- (1-r_1)*(1-r_2)*(1-r_3)
If mk1 has 0.2 and mk2 has 0.4 resistance, than
2xMk1 = 0.36
1xMk1 + 1xMk2 = 0.52
2xMk2 = 0.64

6xMk1 = 0.74
4xMk2 = 0.87
6xMk1 + 4xMk2 = 0.97

That's not how the game does resistances. Resistances are a per-entity thing - not a merged set of all resistances. In the character example the character has resistances, the armor has resistances and they're both calculated separately. first the armor then the character. If shields had resistances it would calculate them one at a time meaning having different resistances across different shields just wouldn't work.

Then maybe just get the highest value of all shield entities and ignore the rest?

[darkfrei]

That's not how the game does resistances. Resistances are a per-entity thing - not a merged set of all resistances. In the character example the character has resistances, the armor has resistances and they're both calculated separately. first the armor then the character. If shields had resistances it would calculate them one at a time meaning having different resistances across different shields just wouldn't work.

So if I have two resistances: 20% by armor and 20% by character, what damage I get from 100 damage?
What if character 20%, armor 40%?
What if character 40%, armor 40%?

answer

If mk1 has 0.2 and mk2 has 0.4 resistance, than
2xMk1 = 0.36 (damage = 64%)
1xMk1 + 1xMk2 = 0.52 (damage = 48%)
2xMk2 = 0.64 (damage = 36%)

[eradicator]

If mk1 has 0.2 and mk2 has 0.4 resistance, than
2xMk1 = 0.36 (damage = 64%)
1xMk1 + 1xMk2 = 0.52 (damage = 48%)
2xMk2 = 0.64 (damage = 36%)

That sort of multiplicatoin is ridiculous. It would mean that if you stack 10 shields with 10% reduction "each" you end up with 65% total reduction. Far too strong. Also as Rsed says (and as the game GUI and general player experience suggest) all shield "emitters" merge into one big shield bubble, they're not seperate.

So for the shield bubble to have resistances we need to take the average of all emitters (==shield equipment):

Average resistance = 1 - ( ( (emitter1_count * emitter1_shield_capacity * emitter1_resistance) + (emitter2_count * emitter2_shield_capacity * emitter2_resistance) + (etc...) ) / total_emitter_capacity ).

Example 1:
10 Emitters with 0.6 resistance and 100 hp each:
→ 1 - ((10 * (1-0.6) * 100) / (10 * 100)) = 0.6
As expected using multiple identical emitters does not change resistance.

Example 2:
5 Emitters with 0.2 resistance and 500 hp each and 5 Emitters with 0.9 resistance and 100 hp each:
→ 1 - ( ( (5*(1-0.2)*500) + (5*(1-0.9)*100) ) / (5*500 + 5*100) ) = 0.31666
The less resistant emitters have much more capacity and thus strongly reduce the effect of the high resistance emitters.

[darkfrei]

That sort of multiplicatoin is ridiculous. It would mean that if you stack 10 shields with 10% reduction "each" you end up with 65% total reduction.

In the character example the character has resistances, the armor has resistances and they're both calculated separately. first the armor then the character.

1. The biter bites you with 100 hp damage.
2. The armor has 40% resist and you must get (100 hp * 60%) = 60 hp damage.
3. The character has 20% resist and you must get (60 hp * 80%) = 48 hp damage.

The same you get when you calculate it in opposite direction. The main formula is also: resist = 1-(1-resist_armor)*(1-resist_character) = 1-(1-0.4)*(1-0.2) = 1-0.48 = 0.52
So, 20% resist + 40% resist = 52 % resist.