WEBVTT 00:00.440 --> 00:05.510 And this lesson, we're going to fix two issues with the forum, the first one is the same issue is 00:05.510 --> 00:05.870 the need. 00:05.900 --> 00:13.400 When we move the hand, we can see that this bone crashes in through the elbow. 00:13.700 --> 00:17.660 So we need to adjust where the joint pivot is rotating from. 00:18.140 --> 00:20.960 So let's select both of these joints. 00:22.370 --> 00:32.300 And will actually unapparent all of the bones first so that they don't get all wonky and go everywhere, 00:33.620 --> 00:39.290 so I'll hit shift pee after selecting them, which will unapparent them, I'm going to select both of 00:39.290 --> 00:48.170 these joints and I'm going to make sure I'm on the world move manipulator option here and I'm going 00:48.170 --> 00:51.790 to go to skin move skinned joints. 00:52.850 --> 00:58.850 Now we can see we have that tool selected and we can just move this pivot forward. 00:59.270 --> 01:00.500 Let's go to the top view. 01:01.520 --> 01:04.970 Spacebar, left click, top view, let go. 01:05.660 --> 01:08.510 And now we can see kind of relationship. 01:08.510 --> 01:12.680 I'm looking from here to here and we don't want to go on this side of that. 01:12.680 --> 01:12.950 Right. 01:12.960 --> 01:18.870 If I was to draw a straight line from here all the way through to this joint, I don't want this metal 01:18.890 --> 01:20.480 joint to go past that line. 01:20.690 --> 01:24.830 So I need to stay on this top side of that line, that imaginary line. 01:25.250 --> 01:29.270 So I'm going to drag these four just until that point. 01:29.810 --> 01:36.710 And now I can go back and parent all of these up again and test this out. 01:48.400 --> 01:55.750 So we haven't parented, I can select the hand control and you can see it works much, much better and 01:55.750 --> 02:02.050 I think that is a reasonable amount of crashing on this rig to to be able to put up with. 02:02.410 --> 02:04.120 So I think that's fixed that issue. 02:04.450 --> 02:10.720 So the second issue we want to address is the fact that when we rotate the wrist, we select the hand 02:10.720 --> 02:13.060 control here and we rotate the wrist. 02:13.060 --> 02:15.030 The form itself does not rotate. 02:15.760 --> 02:18.370 So take a second and look at your own forearm. 02:18.640 --> 02:19.930 Rotate your wrist. 02:19.960 --> 02:21.640 Right, rotate your wrist. 02:21.640 --> 02:27.330 Just like I'm rotating this and look and feel of what your actual forearm bones are doing. 02:27.520 --> 02:29.500 This is called the radius and the ulna. 02:29.830 --> 02:36.460 And you'll notice that they twist that these two in joints are stuck right there, stuck to the either 02:36.460 --> 02:37.930 end of this hand bone. 02:38.380 --> 02:41.620 And so when they rotate, the hand rotates. 02:41.620 --> 02:43.750 They should stay stuck to the ends of that. 02:44.110 --> 02:44.530 Right. 02:45.040 --> 02:46.900 It twists around each other there. 02:47.200 --> 02:52.810 And they kind of pivot from back here because these stay stationary, but these ends follow the hand. 02:53.260 --> 02:56.020 So let's create a rig that will do that. 02:56.740 --> 02:58.420 So let's think about it. 02:58.420 --> 03:01.540 We need to have something for these to follow. 03:01.720 --> 03:02.140 All right. 03:02.770 --> 03:07.780 It can't follow the hand control because the pivot of the hand controls in between them. 03:08.050 --> 03:14.980 We need something that pivots and or is exactly where kind of the center of these two ends are. 03:15.400 --> 03:18.430 So we need to create something new for that to happen. 03:18.790 --> 03:26.740 So let's create two locators, go to create locator, and we can turn on this little option here. 03:26.740 --> 03:29.290 It says snapped a projected center. 03:29.620 --> 03:30.670 So I'm going to click that. 03:30.790 --> 03:33.370 And with w I'm going to middle mouse drag. 03:33.850 --> 03:40.060 And now that a middle mouse trying, it's constantly trying to find the center of whatever object I'm 03:40.060 --> 03:41.350 middle mouse dragging in. 03:41.770 --> 03:45.580 So I'm going to try to get it somewhere towards the end of the bone here. 03:47.380 --> 03:54.190 And I think that's good, I'm going to duplicate this and I'm going to middle mouse drag into the top 03:54.190 --> 03:59.350 center of this bone and now I'm going to name those. 04:01.650 --> 04:08.280 Radius, aim, actually, and ulna. 04:11.970 --> 04:12.570 Aime. 04:15.180 --> 04:21.870 And I'm going to parent those under the hand control here, so I'm going to select that and happy. 04:22.770 --> 04:26.250 So now when we rotate this, we have two pivot points. 04:27.510 --> 04:36.270 Let me just turn off the polygon so you can see we have two pivot points here that rotate with the Hanken 04:36.300 --> 04:37.610 that are in the center of it. 04:37.950 --> 04:38.870 So that's very helpful. 04:38.880 --> 04:39.660 That's what we need. 04:40.590 --> 04:47.280 So now let's take a look at what we can do to kind of get these to constrain just to those points. 04:47.850 --> 04:51.780 If we were to do like an orange or a pair constrained, that's going to do the entire bone. 04:51.780 --> 04:52.500 And we don't want that. 04:52.500 --> 04:58.380 We just want it to pivot from this end back here and we can turn off this Synthroid snap thing. 04:58.390 --> 05:04.130 Now, we want to pivot from back here and point towards those locators. 05:04.140 --> 05:08.250 So we need to learn about a new constraint that's called the aim constraint, and it does exactly what 05:08.250 --> 05:09.180 you would think it would do. 05:09.520 --> 05:14.910 So I'm going to open this up, open the option box and let's take a look at this real quick. 05:15.270 --> 05:22.080 Any time you see three things like this, three empty boxes or three boxes with numbers in them, you 05:22.080 --> 05:28.920 can reasonably assume that it means this is X, the middle one is Y and this is Z. 05:29.520 --> 05:36.420 And you remember that based on the translate X, Y and Z up here, my will always put these in that 05:36.420 --> 05:36.930 order. 05:36.960 --> 05:37.230 Right. 05:37.320 --> 05:38.580 Whenever your. 05:39.640 --> 05:41.440 Kind of seeing it in a dialog box. 05:41.740 --> 05:45.130 Of course, the rotation order that we learned about earlier, that's something totally different and 05:45.130 --> 05:46.960 we can set that order ourselves. 05:47.350 --> 05:52.780 But when you see it in a menu like this, you can reasonably assume this is X, this is Y and this is 05:52.780 --> 05:56.800 Z, even though it doesn't say that here, that's what these three boxes indicate. 05:56.870 --> 06:05.070 OK, so what this is saying is the aim vector is one, it's in the positive X, X, Y, Z. 06:05.080 --> 06:05.950 So this is X.. 06:06.550 --> 06:12.190 So if we take a look at the bone and we see which way is pointing positive X, that is the arrow. 06:12.190 --> 06:13.780 The Red Arrow is pointing. 06:13.780 --> 06:14.120 Right. 06:14.680 --> 06:16.030 So that's correct. 06:16.030 --> 06:18.040 We wanted to aim in that direction. 06:18.040 --> 06:19.660 So the default is correct. 06:19.960 --> 06:29.500 The other vector is y positive y this is that's fine by me and that is pretty much all we need to make 06:29.500 --> 06:31.060 sure is oriented correctly. 06:31.630 --> 06:36.210 So let's select the locator first and then the joint and lets it apply. 06:37.300 --> 06:38.920 Now let's do the same for the other. 06:39.310 --> 06:42.040 We'll select the locator and then the joint and had apply. 06:43.790 --> 06:48.050 And now let's rotate the risk on and we can see. 06:50.340 --> 06:53.560 Like, I just get super excited over the simplest stuff. 06:53.580 --> 07:00.450 I love this stuff, we can see that this is actually rotating around each other and it looks kind of 07:01.170 --> 07:05.610 frickin believable how bones rotate. 07:06.300 --> 07:11.550 I just love stuff like this, how you can click a couple of buttons and then you've recreated what a 07:11.550 --> 07:12.150 human does. 07:13.530 --> 07:14.730 So that's pretty awesome. 07:15.510 --> 07:21.750 So the next lesson, we're going to address the head and how we can add a little more expression to 07:21.750 --> 07:22.540 that model. 07:22.920 --> 07:23.580 Thanks for watching.