WEBVTT 00:06.860 --> 00:08.000 Welcome back. 00:08.390 --> 00:12.410 We're now going to talk about the modifier order of operations. 00:12.530 --> 00:18.860 Now, we've seen that when we just add multiple modifiers and they're all affecting the health attribute 00:18.860 --> 00:24.480 and they all have their modifier op set to add, then the result is pretty simple. 00:24.500 --> 00:31.160 We take our health attribute and add the value of the modifiers backing attribute. 00:31.190 --> 00:40.820 Here we have first, our vigor attribute backing the first modifier and then we have our strength attribute 00:40.820 --> 00:42.190 backing the second. 00:42.200 --> 00:49.760 And as you would probably guess, if we added another one and we chose the health attribute yet again 00:49.760 --> 00:52.100 for this one, we left it at Add. 00:52.100 --> 00:58.940 And if we set the magnitude calculation type to attribute based and we set our backing attribute to 00:58.940 --> 01:05.510 yet another attribute such as resilience, choosing our attribute source to be target, then I think 01:05.540 --> 01:08.910 you could guess what's going to happen, right? 01:08.940 --> 01:11.970 Obviously the attributes will be added together. 01:11.970 --> 01:18.930 So starting at a health of 50, if we overlap, we see that our health becomes 81, which is 50 plus 01:18.930 --> 01:23.650 nine plus 12, which is resilience plus ten. 01:23.670 --> 01:25.560 That all equals 81. 01:25.560 --> 01:27.740 So it's as expected. 01:27.750 --> 01:32.790 But let's talk about what happens if we change these modifier operations a little bit. 01:33.060 --> 01:38.400 And as we're making different changes, I'd like to make the math simple for us. 01:38.400 --> 01:40.950 So I'm going to go ahead and close out. 01:40.950 --> 01:48.660 And in the attribute set, I'm going to initialize the health to ten just so we can make our math a 01:48.660 --> 01:50.610 little bit easier to understand. 01:50.610 --> 01:53.490 So let's talk about the different operations. 01:54.090 --> 02:00.780 So we're now initializing our health to a value of ten, and we know that we can add a modifier to a 02:00.780 --> 02:01.920 gameplay effect. 02:01.950 --> 02:04.480 Choosing an Attribute to effect. 02:04.500 --> 02:07.680 So far, we're just affecting the health attribute. 02:07.710 --> 02:15.360 We choose a modifier operation such as Add and for attribute based modifiers, we choose the backing 02:15.360 --> 02:16.130 attribute. 02:16.140 --> 02:22.710 So in this case, if we choose vigor and our vigor just happens to have a value of nine, then we know 02:22.710 --> 02:25.320 that nine will be added to the health. 02:25.350 --> 02:33.510 Likewise, if we add another modifier set to target the health with an add modifier op with the backing 02:33.510 --> 02:40.260 attribute of strength and our strength is ten, we know the result will be that ten will be added to 02:40.260 --> 02:47.670 the health as a result of this modifier and likewise with another add modifier backed by the attribute 02:47.670 --> 02:49.380 resilience, which is 12. 02:49.410 --> 02:50.670 We know what happens. 02:50.670 --> 02:52.930 12 gets added to the health as well. 02:52.950 --> 02:55.120 Now these happen in order. 02:55.210 --> 02:59.980 So the first modifier is applied, then the second, then the third. 02:59.980 --> 03:06.100 And the result is that our health, the affected attribute gets the addition of the first modifier. 03:06.130 --> 03:09.790 That's vigor plus the addition of the second modifier. 03:09.790 --> 03:12.040 That's strength plus the third. 03:12.040 --> 03:13.240 That's resilience. 03:13.240 --> 03:17.710 And the result of this calculation comes out to 41. 03:18.010 --> 03:22.750 Our health was ten and we added nine plus ten plus 12. 03:22.930 --> 03:25.930 So let's just make sure that that math adds up. 03:25.960 --> 03:27.970 We initialized our health to ten. 03:27.970 --> 03:30.130 Now let's run this. 03:30.460 --> 03:38.620 We can go ahead and open up our asset editors and our test attribute based gameplay effect has three 03:38.620 --> 03:42.060 attribute based modifiers just like in the slide. 03:42.070 --> 03:49.870 The first is backed by the vigor, the second is backed by strength, and the third is backed by resilience. 03:49.870 --> 03:51.910 And they are all set to add. 03:52.120 --> 03:59.740 Now we're starting off with ten health as we can see when we show debug and if we overlap, our health 03:59.740 --> 04:03.160 becomes 41, just like in the slide. 04:03.310 --> 04:10.570 So our understanding of the order of operations with add modifier ops is correct. 04:10.600 --> 04:13.510 Now let's consider a more complicated case. 04:13.510 --> 04:20.230 Let's say that the first modifier is backed by vigor and it's Add just like before. 04:20.680 --> 04:28.360 But the second modifier, which is backed by strength, is now set to have multiply as its modifier 04:28.390 --> 04:28.990 op. 04:28.990 --> 04:33.960 And the third modifier is still resilience and still add. 04:33.970 --> 04:40.450 So the only thing we're going to change here is that that middle modifier is set to multiply. 04:40.660 --> 04:46.810 Now, as we've mentioned before, these happen in order, so the first modifier is applied, then the 04:46.810 --> 04:48.580 second, then the third. 04:48.580 --> 04:51.820 So the mathematics of this is as follows. 04:52.210 --> 04:56.800 We have our health, the first modifier is applied, so we add vigor. 04:56.830 --> 04:58.900 Ten plus nine is 19. 04:58.900 --> 05:04.630 So the result of this then has the next modifier applied to it. 05:04.630 --> 05:08.110 So that 19 is going to be multiplied by ten. 05:08.140 --> 05:10.090 That gives us 190. 05:10.210 --> 05:16.570 Then the next modifier takes the result of that and applies its modification. 05:16.570 --> 05:20.830 We're adding 12, so we have 190 plus 12. 05:20.860 --> 05:22.750 That equals 202. 05:22.780 --> 05:25.000 Let's see if this math checks out. 05:25.420 --> 05:32.950 So back in our test attribute based, we want to change that middle modifier so that its modifier op 05:32.950 --> 05:34.350 is now multiply. 05:34.360 --> 05:35.770 So we'll change that. 05:35.800 --> 05:37.630 The other two are still Add. 05:37.660 --> 05:41.500 Let's go ahead and press play show debug. 05:42.010 --> 05:49.180 Health starts at ten and as we overlap we see that our health is actually 100 because we're clamping, 05:49.180 --> 05:49.930 aren't we? 05:50.110 --> 05:52.810 Let's go ahead and undo that clamping. 05:53.200 --> 05:57.160 I'm going to close the editor and back in our attributes set. 05:57.250 --> 05:59.710 We're clamping and pre attribute change. 05:59.710 --> 06:02.320 I'm going to comment out both of those lines. 06:02.350 --> 06:07.510 Really, we just care about health right now, but I'm going to comment those lines out and here in 06:07.510 --> 06:13.090 post gameplay effect execute I'm going to comment out the lines where we're clamping here as well. 06:13.960 --> 06:16.660 And I'll go ahead and run in debug mode. 06:17.680 --> 06:18.100 Okay. 06:18.100 --> 06:23.860 So now that we're no longer clamping, I'll go ahead and open up those asset editors and we'll make 06:23.860 --> 06:27.970 sure the modifier op for the middle modifier is set to multiply. 06:27.970 --> 06:28.890 It is. 06:28.900 --> 06:33.550 And now that we're no longer clamping, let's see if we get the value we expect. 06:33.550 --> 06:41.500 And just to remind ourselves, we're expecting a value of 202 here so we can press play show. 06:41.500 --> 06:49.090 Debug health is ten and as we overlap with this volume, health goes to 202, which is exactly what 06:49.090 --> 06:50.200 we expected. 06:50.440 --> 06:55.100 So we see that these modifiers are applied in order. 06:55.120 --> 06:57.160 Now let's consider another case. 06:57.190 --> 06:58.850 Our health starts at ten. 06:58.870 --> 07:06.340 Our first modifier will still be vigor and will still be add our second modifier that will still be 07:06.340 --> 07:09.940 backed by strength and will keep its modifier op at multiply. 07:09.940 --> 07:13.760 But the third modifier, let's say we change that one. 07:13.760 --> 07:21.080 So now our resilience instead of Add is now going to be a divide modifier op. 07:21.260 --> 07:27.800 Now this is going to work just like before in that the first modifier will be applied, then the second, 07:27.830 --> 07:29.060 then the third. 07:29.060 --> 07:32.480 So it's going to take our health value, which is ten. 07:32.510 --> 07:35.720 We'll have the value of vigor added to it. 07:35.720 --> 07:41.990 And the result of this, which is 19, will then be modified by strength, just like before. 07:41.990 --> 07:43.850 That gives us 190. 07:43.850 --> 07:52.220 And then the result of this, which is 190, is going to have the third modifier applied, which is 07:52.220 --> 07:54.320 to divide resilience. 07:54.320 --> 07:55.700 That's 12. 07:55.730 --> 07:59.720 So the result should be 190 divided by 12. 07:59.750 --> 08:09.470 If we pull up a calculator, we're going to have 190 divided by 12, which gives us 15.83 repeating. 08:09.710 --> 08:16.700 So we see that the result of these three modifiers should give us 15.83 for the health. 08:16.730 --> 08:18.890 Let's see if that math checks out. 08:18.920 --> 08:25.490 So we'll go to our test based attribute and we're going to leave the first two modifiers as they are 08:25.490 --> 08:30.200 and take the third one and change it from add to divide. 08:30.500 --> 08:32.600 Let's go ahead and test this out. 08:32.630 --> 08:34.000 We'll show debug. 08:34.010 --> 08:40.280 Our health is ten and as we overlap, our health becomes 15.83. 08:40.790 --> 08:44.060 And again, that's the value we expected. 08:44.240 --> 08:44.870 Okay. 08:44.870 --> 08:51.110 So we understand that well, so we know that these are applied in order, right? 08:51.110 --> 08:54.530 So what happens if we add a fourth modifier? 08:54.560 --> 09:01.280 Let's say that it's backing attribute is max health and it's modifier op is set to add. 09:01.580 --> 09:03.380 So how does this change things? 09:03.380 --> 09:08.240 Well, the results of the first three will simply be modified by the fourth one. 09:08.240 --> 09:10.640 So we get our health, we add vigor. 09:10.640 --> 09:15.890 That's the first modifier, the result of this is multiplied by the strength. 09:15.890 --> 09:17.630 That's our second modifier. 09:17.660 --> 09:24.380 The result of this is divided by resilience, and the result of this entire thing will then be added 09:24.380 --> 09:26.150 to by max health. 09:26.600 --> 09:31.370 So before it was 15.83, we're adding 100 to that. 09:31.370 --> 09:34.850 So the result should be 115 .83. 09:35.180 --> 09:37.430 Let's make sure that math checks out. 09:37.920 --> 09:44.610 So back in our gameplay effect, we're going to add one more modifier to the modifiers array. 09:44.640 --> 09:46.440 We're going to expand it. 09:46.470 --> 09:49.860 We'd like our attribute affected to be health. 09:50.130 --> 09:55.620 We'd like to use Add for the modifier OP for modifier magnitude. 09:55.620 --> 10:02.520 We're going to change it to attribute based and expanding attribute based magnitude and expanding backing 10:02.520 --> 10:03.270 attribute. 10:03.300 --> 10:08.310 We're setting the backing attribute this time to max health, which is 100, and we'll go ahead and 10:08.310 --> 10:10.500 set that attribute source to Target. 10:10.500 --> 10:14.460 And we're expecting to see 115 .83. 10:14.490 --> 10:23.640 Let's press play show debug and overlap and there it is, 115 .83 just as expected. 10:24.000 --> 10:30.690 So now that we understand the order of operations of our modifiers in a gameplay effect, we now can 10:30.690 --> 10:34.110 mix and match and make a gameplay effect. 10:34.110 --> 10:38.080 Change an attribute based on any number of other attributes. 10:38.080 --> 10:42.920 And we can structure this to get a lot of different results. 10:42.940 --> 10:50.500 But you're probably wondering under attribute based magnitude what these three parameters are coefficient 10:50.500 --> 10:54.820 pre, multiply additive value and post multiply additive value. 10:54.850 --> 11:02.490 Well, the truth is we can make the mathematics even more customized by specifying values for these 11:02.500 --> 11:05.230 and we're going to see how they work in the next video. 11:05.410 --> 11:06.650 So great job. 11:06.670 --> 11:07.870 I'll see you soon.