1 00:00:04,440 --> 00:00:04,830 ‫Hello. 2 00:00:04,830 --> 00:00:05,340 ‫Welcome. 3 00:00:05,340 --> 00:00:09,330 ‫In this lecture, we are going to get our foot sliding in order. 4 00:00:09,330 --> 00:00:09,900 ‫As you can see. 5 00:00:09,900 --> 00:00:12,900 ‫Now, if I'm walking, my feet are no longer sliding. 6 00:00:12,900 --> 00:00:15,630 ‫And if I'm running the same, I'm also not sliding. 7 00:00:15,630 --> 00:00:20,820 ‫So let's dive in and see how we can do this by calculating the speed of our animations. 8 00:00:21,620 --> 00:00:24,890 ‫So let's try and fix this foot sliding issue. 9 00:00:24,890 --> 00:00:31,430 ‫If I'm moving especially visible at a slow walking speed, you can see he's basically running across 10 00:00:31,430 --> 00:00:32,100 ‫the ground. 11 00:00:32,120 --> 00:00:33,890 ‫Now, why is this happening? 12 00:00:33,980 --> 00:00:41,780 ‫The reason this is happening is that in our blend space, locomotion, we have got some speeds set up 13 00:00:41,780 --> 00:00:42,230 ‫here. 14 00:00:42,230 --> 00:00:45,710 ‫And these don't actually correspond to the speeds of our animation. 15 00:00:45,710 --> 00:00:52,490 ‫So what we're saying is that in gameplay, we're moving at 100 centimeters a second, is going to be 16 00:00:52,490 --> 00:00:53,750 ‫playing this running animation. 17 00:00:53,750 --> 00:00:58,850 ‫And if this running animation is faster than 100 centimeters per second, you're going to get foot sliding. 18 00:00:58,850 --> 00:01:00,860 ‫Also, if it's slower, you're going to get foot sliding. 19 00:01:00,860 --> 00:01:02,810 ‫In both cases, you'll get foot sliding. 20 00:01:02,810 --> 00:01:09,590 ‫So what we want to do is match up these axes to actually play the correct animation at the correct speed 21 00:01:09,590 --> 00:01:12,680 ‫and then interpolate when we're at a different speed. 22 00:01:12,830 --> 00:01:16,640 ‫Obviously, this is going to mean that there is a limitation on our gameplay. 23 00:01:16,640 --> 00:01:25,370 ‫We can't go faster than our maximum animation will allow because we are unable to display that. 24 00:01:25,370 --> 00:01:31,130 ‫But if you did want to do that and you did want to go faster, then you would have to get more animations 25 00:01:31,130 --> 00:01:31,550 ‫and so on. 26 00:01:31,550 --> 00:01:37,790 ‫But as I said, that allows our designer to change up the gameplay first and then we can go and hunt 27 00:01:37,790 --> 00:01:39,410 ‫for animations if it works. 28 00:01:39,740 --> 00:01:43,220 ‫So let's have a look at this run animation. 29 00:01:43,220 --> 00:01:45,740 ‫How can we calculate the speed of this run animation? 30 00:01:45,740 --> 00:01:52,160 ‫It's not automatically told to us by Unreal, so there's a little bit of maths involved to get there. 31 00:01:52,160 --> 00:02:00,530 ‫Let's go and find the jog forward animation and we want the jog forward combat in particular. 32 00:02:01,010 --> 00:02:01,820 ‫Here it is. 33 00:02:02,000 --> 00:02:03,830 ‫And how do we go ahead and get this? 34 00:02:03,830 --> 00:02:06,470 ‫Let's just pause the playing of the animation. 35 00:02:07,040 --> 00:02:13,160 ‫What we want to see essentially is how fast one of these feet moves across the floor. 36 00:02:13,160 --> 00:02:20,960 ‫So from the point it touches down to the point that it is starting to leave the floor, we want to know 37 00:02:20,960 --> 00:02:23,450 ‫how fast it moved across the ground. 38 00:02:23,450 --> 00:02:25,940 ‫And that is the speed of animation. 39 00:02:26,300 --> 00:02:31,100 ‫To do that, we are going to track the speed of the ankle bone. 40 00:02:31,100 --> 00:02:38,660 ‫So if I click into the world, you can see I should be able to select the foot, underscore R As of 41 00:02:38,660 --> 00:02:43,370 ‫Unreal five, you're no longer able to actually click into the viewport to select the bone. 42 00:02:43,370 --> 00:02:48,350 ‫So what you'll have to do is go over into the skeleton tab over in the left and use the search bar to 43 00:02:48,350 --> 00:02:49,490 ‫search for this bone. 44 00:02:49,820 --> 00:02:51,260 ‫And that is our ankle bone. 45 00:02:51,260 --> 00:02:56,780 ‫And as we move across, you can see that it is moving the rotation, but notice it's not changing the 46 00:02:56,780 --> 00:02:57,320 ‫location. 47 00:02:57,320 --> 00:02:58,070 ‫Why is that? 48 00:02:58,280 --> 00:03:02,840 ‫Because the location shown here is a local rotation, local location, rather. 49 00:03:02,840 --> 00:03:08,360 ‫And that location is relative to the knee and it's not actually moving relative to the knee. 50 00:03:08,360 --> 00:03:10,610 ‫It's only rotating relative to the knee. 51 00:03:10,610 --> 00:03:12,620 ‫So that's why we are getting that. 52 00:03:12,620 --> 00:03:20,420 ‫If we switch over to the world location and go ahead and move now, you can definitely see that we're 53 00:03:20,420 --> 00:03:23,180 ‫getting movements in our location. 54 00:03:23,180 --> 00:03:30,020 ‫So we need to switch over to world for this calculation to work and then we want to find two points. 55 00:03:30,020 --> 00:03:36,200 ‫The point at which we land, we are going to want to find out the y value, y the y value, because 56 00:03:36,200 --> 00:03:39,710 ‫that is this axis here that we're looking at from left to right. 57 00:03:39,710 --> 00:03:40,580 ‫It's the y axis. 58 00:03:40,580 --> 00:03:44,330 ‫You can see it in the widget at the bottom left of your viewport. 59 00:03:44,330 --> 00:03:48,230 ‫So we're going to want to find the Y value when we hit the floor. 60 00:03:48,230 --> 00:03:53,000 ‫We're also going to want to find the time at which we hit the floor, which is this second number in 61 00:03:53,000 --> 00:03:56,990 ‫brackets on our timeline, the 0.19. 62 00:03:57,620 --> 00:04:02,720 ‫And we're going to then go and look and find the second time, which is where we're going to leave the 63 00:04:02,720 --> 00:04:05,540 ‫floor, find that time, find the Y value. 64 00:04:05,540 --> 00:04:08,300 ‫And then we're going to apply this formula here. 65 00:04:08,300 --> 00:04:09,410 ‫Let me break it down. 66 00:04:09,440 --> 00:04:11,750 ‫The first thing is to calculate the foot speed. 67 00:04:11,750 --> 00:04:16,490 ‫We need to calculate the Y at the finish minus the Y at the start. 68 00:04:16,600 --> 00:04:22,160 ‫We want to divide that by the time at the finish divided by the time at the start. 69 00:04:22,160 --> 00:04:24,170 ‫So I'm going to work through this calculation with you. 70 00:04:24,200 --> 00:04:29,360 ‫All you're going to need is somewhere to capture the numbers, such as a new notepad, or I'm going 71 00:04:29,360 --> 00:04:33,800 ‫to use a new text document in a Visual Studio code, just an untitled one. 72 00:04:33,800 --> 00:04:38,860 ‫I don't need to save it or anything, and I'm going to open up a calculator on Windows. 73 00:04:38,870 --> 00:04:43,910 ‫It's just easier to do it on your computer because you can copy and paste into it. 74 00:04:44,720 --> 00:04:47,240 ‫And we're going to start finding some values. 75 00:04:47,240 --> 00:04:52,880 ‫First of all, we want to find where do we hit the floor about here, which is going to be a time, 76 00:04:52,880 --> 00:04:55,790 ‫0.16. 77 00:04:55,790 --> 00:04:58,310 ‫Let's type that in to our text document. 78 00:04:58,310 --> 00:05:01,400 ‫1.16. 79 00:05:02,250 --> 00:05:04,170 ‫I go one six like that. 80 00:05:04,260 --> 00:05:06,300 ‫And what's the Y value? 81 00:05:06,330 --> 00:05:09,270 ‫Best to capture it now because it's going to be hard to find later. 82 00:05:09,360 --> 00:05:10,310 ‫It is. 83 00:05:10,320 --> 00:05:15,420 ‫Let's just go ahead and copy it because it's hard to see at my screen, resolution 17 point something 84 00:05:15,420 --> 00:05:15,960 ‫cool. 85 00:05:16,200 --> 00:05:17,660 ‫Now that's the start. 86 00:05:17,670 --> 00:05:19,410 ‫Where is the finish? 87 00:05:19,440 --> 00:05:21,680 ‫Let's go and drag the foot across. 88 00:05:21,690 --> 00:05:32,280 ‫Around here is probably where we're leaving the ground and it is conveniently 0.30 and the Y is going 89 00:05:32,280 --> 00:05:36,930 ‫to be a negative number now minus to eight point vega. 90 00:05:37,740 --> 00:05:39,830 ‫So let's apply our formula. 91 00:05:39,840 --> 00:05:42,000 ‫First of all, it's the finish that we want in there. 92 00:05:42,000 --> 00:05:43,040 ‫First, not the start. 93 00:05:43,050 --> 00:05:46,590 ‫Counterintuitively, we're going to subtract the start. 94 00:05:47,700 --> 00:05:48,360 ‫Like that. 95 00:05:48,390 --> 00:05:51,210 ‫It's going to give us a negative number of that's how far we moved. 96 00:05:51,210 --> 00:05:54,870 ‫45 centimeters is how far that foot moved in one stride. 97 00:05:55,050 --> 00:05:57,590 ‫Now, how long did it take for that to happen? 98 00:05:57,600 --> 00:06:03,570 ‫First of all, let's let's get that number down in our file, in our text file and see how long it took. 99 00:06:03,570 --> 00:06:06,600 ‫Let's clear and start with the finish. 100 00:06:07,450 --> 00:06:09,460 ‫And then subtract. 101 00:06:10,240 --> 00:06:13,450 ‫The start gives us this number. 102 00:06:13,570 --> 00:06:18,670 ‫So I'm going to copy which is control C on Windows without selecting anything, it just automatically 103 00:06:18,670 --> 00:06:19,930 ‫copies the number that's there. 104 00:06:20,530 --> 00:06:22,930 ‫And then we're going to want to work out what this is equal to. 105 00:06:22,960 --> 00:06:29,140 ‫So let's clear and start with the -45 and divide. 106 00:06:29,960 --> 00:06:31,970 ‫By the 0.14. 107 00:06:32,600 --> 00:06:35,360 ‫And to gives us this number right here. 108 00:06:36,140 --> 00:06:36,980 ‫Like that. 109 00:06:38,420 --> 00:06:43,550 ‫So this is telling us that our jog speed is giving us a negative number because that's kind of going 110 00:06:43,550 --> 00:06:44,450 ‫backwards. 111 00:06:44,450 --> 00:06:52,940 ‫But the jog speed forwards essentially is going to be 325, approximately centimeters per second. 112 00:06:52,940 --> 00:06:56,900 ‫So that's what we're going to want to have in our blend space. 113 00:06:58,350 --> 00:07:02,190 ‫So we now need to do the same thing for our walking animation. 114 00:07:02,190 --> 00:07:07,080 ‫So that's going to be a challenge for you to calculate the walk speed as well as the run speed find 115 00:07:07,080 --> 00:07:11,940 ‫the walking animation that's relevant, probably the forward one, and apply the formula and do it the 116 00:07:11,940 --> 00:07:13,260 ‫same as we just did. 117 00:07:13,260 --> 00:07:19,290 ‫Finding the foot speed is why finish minus y start divided by t finish minus t start. 118 00:07:19,290 --> 00:07:23,610 ‫So pause the video and have a go and see what speed you come up with. 119 00:07:24,400 --> 00:07:24,640 ‫Okay. 120 00:07:24,640 --> 00:07:25,120 ‫Welcome back. 121 00:07:25,120 --> 00:07:29,800 ‫So let's go and find what is the correct thing here. 122 00:07:29,800 --> 00:07:36,280 ‫We're going to want to find, first of all, our blend space and see what animation we were using just 123 00:07:36,280 --> 00:07:37,780 ‫to jog our memories. 124 00:07:38,080 --> 00:07:47,350 ‫The value here is the MP walk forward, so let's find that out and B walk forward. 125 00:07:47,350 --> 00:07:52,540 ‫Let's open that animation up and we should see that it's going to be a much slower animation than the 126 00:07:52,540 --> 00:07:56,380 ‫other one and we're going to find our values. 127 00:07:56,380 --> 00:08:01,780 ‫So first of all, let's find the plant that's about here after the foot started moving is probably the 128 00:08:01,780 --> 00:08:03,760 ‫best place like that. 129 00:08:04,180 --> 00:08:07,150 ‫So that is let's go and add some new lines in here. 130 00:08:07,150 --> 00:08:15,970 ‫It's going to be 0.34 like so and go and find the details of this foot bone. 131 00:08:15,970 --> 00:08:21,520 ‫So like the foot bone world, we've already got selected and we're going to find its location. 132 00:08:21,520 --> 00:08:27,340 ‫That's why then we go and move the foot back until we're almost leaving the ground, which is going 133 00:08:27,340 --> 00:08:28,630 ‫to be at zero point. 134 00:08:29,440 --> 00:08:30,700 ‫Six seven. 135 00:08:31,400 --> 00:08:35,240 ‫And the why is going to be a -22 thing. 136 00:08:35,540 --> 00:08:36,020 ‫There you go. 137 00:08:36,290 --> 00:08:38,450 ‫Moving the same distance, sort of. 138 00:08:38,450 --> 00:08:42,080 ‫But you can see that the time taken is much longer. 139 00:08:42,080 --> 00:08:43,770 ‫So it's going to be much slower. 140 00:08:43,790 --> 00:08:45,860 ‫So let's open up our calculator again. 141 00:08:46,990 --> 00:08:50,620 ‫And first of all, calculate the finish minus the start. 142 00:08:50,620 --> 00:08:54,610 ‫So finish minus the start. 143 00:08:55,360 --> 00:08:56,740 ‫Gives us this. 144 00:08:58,500 --> 00:09:00,390 ‫Say, as you see very similar distance. 145 00:09:00,630 --> 00:09:04,290 ‫And probably if I'd select a different timestamps, it would have been the same distance. 146 00:09:04,560 --> 00:09:06,420 ‫Then we're going to get the finish time. 147 00:09:06,420 --> 00:09:12,060 ‫So clear this finish time minus the start time. 148 00:09:13,030 --> 00:09:16,310 ‫It gives us a much longer time, almost twice as long. 149 00:09:16,310 --> 00:09:19,760 ‫So I'm assuming it's going to be almost twice as slow. 150 00:09:19,880 --> 00:09:24,200 ‫So let's clear and get our 42. 151 00:09:25,260 --> 00:09:28,380 ‫Divided by 0.33. 152 00:09:30,120 --> 00:09:37,110 ‫Gives us indeed something that's more like minus or basically 130. 153 00:09:38,010 --> 00:09:39,390 ‫So I copy that. 154 00:09:39,930 --> 00:09:43,530 ‫Interestingly, when it's the bigger form, it doesn't copy as easily. 155 00:09:43,680 --> 00:09:44,490 ‫There you go. 156 00:09:44,520 --> 00:09:50,910 ‫So this is basically our speed, 130 and 3 to 5. 157 00:09:51,180 --> 00:09:53,730 ‫Now, how do we get this in to our blend space? 158 00:09:53,730 --> 00:09:54,870 ‫That wasn't part of your challenge. 159 00:09:54,870 --> 00:09:56,460 ‫But we're going to do this now. 160 00:09:56,490 --> 00:10:02,820 ‫Let's open up our blend space location, because these divisions aren't so easy for us to do that. 161 00:10:04,410 --> 00:10:08,270 ‫Well, the first thing is that we don't need to get things exactly 100% right. 162 00:10:08,280 --> 00:10:16,620 ‫But the second thing is that we can change the divisions or the number of divisions on our speed axis. 163 00:10:17,490 --> 00:10:23,340 ‫So the way I'm going to do this is I'm going to round these two values to approximately the nearest 164 00:10:23,340 --> 00:10:26,550 ‫50 and use 50 divisions. 165 00:10:26,550 --> 00:10:31,770 ‫So what we'd have here is this one's going to round up to 350. 166 00:10:31,800 --> 00:10:34,290 ‫This one's going to round up to 150. 167 00:10:34,650 --> 00:10:38,010 ‫And then what we can do is figure out how many divisions we need. 168 00:10:38,310 --> 00:10:42,720 ‫So 350 divided by 50 is going to give us seven. 169 00:10:42,960 --> 00:10:45,150 ‫So let's go to our speed. 170 00:10:45,150 --> 00:10:52,590 ‫And in seven divisions, add the maximum axis value to be 350 like so. 171 00:10:52,590 --> 00:11:01,080 ‫And now what we should get is at the 350 mark, we are going to be running when we're down at 150, 172 00:11:01,080 --> 00:11:03,090 ‫we are going to be walking. 173 00:11:03,090 --> 00:11:07,500 ‫So if we save and then anywhere in between, obviously it's going to interpolate as best it can. 174 00:11:07,980 --> 00:11:13,210 ‫Now let's go ahead and play and see if that's helped fix our foot sliding issue. 175 00:11:13,230 --> 00:11:15,560 ‫Let's look down at the ground so we can see our feet. 176 00:11:15,570 --> 00:11:22,050 ‫As I am walking, you can see we've got far less if no foot sliding whatsoever as we run. 177 00:11:22,050 --> 00:11:24,870 ‫It's certainly no noticeable foot sliding now. 178 00:11:24,870 --> 00:11:32,970 ‫So I'm quite happy that we've successfully calculated a decent approximation for the speed of our animations 179 00:11:33,420 --> 00:11:37,740 ‫and hopefully you can apply this to any animations that you use in the future if you're trying to put 180 00:11:37,740 --> 00:11:41,850 ‫them in a blend space or match them up to our foot movement. 181 00:11:43,270 --> 00:11:46,300 ‫So that concludes our little foray into animation. 182 00:11:46,300 --> 00:11:52,120 ‫For now, I think we've got a good starting point for our animation with a third person character. 183 00:11:52,150 --> 00:11:56,710 ‫The next thing that's really missing here is some gun architecture. 184 00:11:56,710 --> 00:12:03,130 ‫So we're going to look at how you architect guns for third person and first person shooters in the next 185 00:12:03,130 --> 00:12:03,630 ‫lecture. 186 00:12:03,640 --> 00:12:04,420 ‫See you there.