WEBVTT 00:00.420 --> 00:02.560 Welcome to the knife tool. 00:02.790 --> 00:06.410 In this video you will learn how to use the knife tool. 00:06.450 --> 00:12.720 You'll see that it gives you many opportunities to craft and Marie craft your model and understand it 00:12.720 --> 00:17.780 can both ruin if you're not careful and thick short apology. 00:18.030 --> 00:23.050 So let's go explore the knife tour now and hop on over into a blender. 00:23.460 --> 00:28.350 Okay so we're over in the default blend farm because we certainly don't want to go hacking and slashing 00:28.350 --> 00:31.760 at the moment to our human head that we're working on. 00:31.920 --> 00:36.070 We can certainly go and do that once we've learned how to use the knife tool. 00:36.090 --> 00:41.490 So first of all where can you find the knife to when it's something that exists on a mesh object whilst 00:41.490 --> 00:42.420 you're in edit mode. 00:42.420 --> 00:44.490 So let's hop into edit mode. 00:44.520 --> 00:47.160 I'm going to zoom in on our cube so you can see what's going on. 00:47.280 --> 00:54.900 Now the knife tool can be found in the tool shelf under a knife under the Tools so we can click that. 00:54.960 --> 00:59.130 Now if we look there we can see the shortcut key is k.. 00:59.420 --> 01:04.460 And if you use the space bar to try and find it it's called something slightly different it's called 01:04.530 --> 01:06.420 Knife topology tool. 01:06.540 --> 01:09.230 But again the shortcut is still k. 01:09.780 --> 01:13.400 Now the knife tool can be a bit unintuitive. 01:13.410 --> 01:20.310 The first time you use it I know I found myself deleting the cuts I was about to make accidentally all 01:20.310 --> 01:21.520 the time. 01:21.720 --> 01:28.710 So let's go ahead now and make a cut in the top of this cube and I'm going to left click to place the 01:28.710 --> 01:34.070 first point and you can see a line join these together another left click left click left click. 01:34.080 --> 01:37.480 Now the points snapped to one another which is very useful. 01:37.590 --> 01:42.650 And if you cross a line that you've just made you can see that it adds an extra. 01:42.660 --> 01:49.380 I'm going to call it a virtex here a point a knife cutting point in order to define where it's crossed 01:49.440 --> 01:52.440 over how long to join it up to this end bit here. 01:52.470 --> 01:58.420 Now if I were to right click at the moment I would lose all of that information. 01:58.470 --> 02:01.530 Frustrating So you're probably going to do that a couple of times. 02:01.530 --> 02:07.800 Don't worry we all go through it and repress the cakey again draw that's have or at least a similar 02:07.800 --> 02:09.560 shape as I had before. 02:09.630 --> 02:14.540 And I want to make sure that this time I don't lose that if we look at the very bottom where the header 02:14.550 --> 02:20.950 by used to be we can see some controls one of which is enter or space to confirm. 02:21.030 --> 02:25.460 I prefer the space keeks is easier for me to get to with this microphone in the way. 02:25.920 --> 02:28.260 But otherwise the end key would also be fine. 02:28.320 --> 02:33.940 And that goes if you've got a number panned as well the enter key there will also change. 02:33.990 --> 02:42.480 Apply that now you'll notice here that blender has put in a couple of additional cuts so we just select 02:42.510 --> 02:47.060 everything there and it's added this one here and the top edge. 02:47.340 --> 02:48.540 Well at the top there. 02:48.600 --> 02:51.750 So these have been defined by a blender. 02:51.750 --> 02:55.280 It's worthwhile knowing that because you can take control. 02:55.290 --> 03:01.410 There was just an equal chance that blender would have joined up different corners in order to preserve 03:01.440 --> 03:02.330 an end gone. 03:02.490 --> 03:07.770 Now the end on itself can't really have a hole in the middle but we see here there's a massive n gone 03:07.770 --> 03:15.420 here with a one two three four five six sides but you can see its face dot is no where near the actual 03:15.420 --> 03:18.330 face itself it's actually outside of it. 03:18.330 --> 03:22.350 This one's got one then I'm not going to bother counting the edges there we've got a triangle there 03:22.590 --> 03:24.070 and a quad in the middle. 03:24.090 --> 03:30.870 Now of course we can go back and press K and go well if that's 1 to 3 I can just join a line up there 03:31.200 --> 03:33.940 and that should be 1 2 3. 03:33.980 --> 03:35.540 That would be for there. 03:35.700 --> 03:40.950 So even though it looks like a trying on way in for it to go read so I know it's on that point there. 03:41.010 --> 03:43.550 I'm going to press space to apply it now. 03:43.560 --> 03:47.040 There are times where you'll want to keep cutting. 03:47.190 --> 03:53.310 I tend to do one cut at a time or a series of cuts and then hit space rather than doing them all individually 03:53.580 --> 03:58.900 or add big long chain just in case I glance the right mouse button or something along those lines. 03:59.010 --> 04:07.900 But when I'm cutting with the work with the knife I can go one to this long range here so one to the 04:08.060 --> 04:09.200 re. 04:10.170 --> 04:11.140 For. 04:11.220 --> 04:13.920 So I've defined another quad there. 04:13.920 --> 04:15.480 Now I press the E key. 04:15.480 --> 04:19.860 I can make another car and go one two 3. 04:19.890 --> 04:22.430 That is actually force I'm not going to do anything there. 04:22.440 --> 04:23.370 This one here. 04:23.580 --> 04:26.760 So got one edge there one here one there. 04:26.760 --> 04:31.530 So once again I can make that 4 by doing that and pressing SPACE. 04:31.560 --> 04:35.370 I don't have to press space straight away though I can go ahead and make another cuts. 04:35.400 --> 04:38.090 So one two three four. 04:38.120 --> 04:39.660 Okay so that's not going to work. 04:39.690 --> 04:40.900 Were just going along murcer. 04:40.910 --> 04:42.690 But a cut here of a Wanted. 04:42.690 --> 04:47.070 Now I'm not really paying attention to anything like edged flow or face flow at the moment. 04:47.070 --> 04:49.280 I'm literally just trying to make quads. 04:49.290 --> 04:54.810 This is a good exercise to practice making quads especially if you've got a triangle in the way so will 04:54.810 --> 04:55.170 do that. 04:55.170 --> 04:58.710 Now I'm going to hit the space bar just to define those. 04:58.710 --> 05:00.610 Now here we have a triangle. 05:01.050 --> 05:05.220 How do you make a triangle a quad where you add another vertex in one of its edges. 05:05.220 --> 05:11.220 That's the easiest way to do it so I could go here 1 2 and just cut straight to the middle. 05:11.220 --> 05:12.550 So let's give that a go now. 05:12.600 --> 05:19.980 Go to there and that is one of the ways that you can to help define where you terminate. 05:19.980 --> 05:22.690 Face loops seems compressed space there. 05:22.770 --> 05:24.500 So if we had a facelift. 05:24.540 --> 05:28.930 Running around here lets that she make one will crossover here. 05:28.950 --> 05:30.360 I'm not gonna worry too much about. 05:30.370 --> 05:32.310 I've made a triangle at the top here. 05:32.340 --> 05:38.340 She's going to apply that same now we should find if I tried looping that face comes around to hear 05:38.550 --> 05:45.960 it's not going to go down here because this is a five sided shape again so I'm with a cart just up here. 05:46.540 --> 05:48.000 And that should be it. 05:48.100 --> 05:53.590 One two three four that should define it so let's see where that flows so that flows up there at the 05:53.590 --> 05:56.460 moment it doesn't flow around here. 05:56.470 --> 06:01.420 And in order to make it to flow around here we'd have to change how it's structured. 06:01.420 --> 06:07.450 Once again if you think about these it's very hard looking at this as a trying goal is very hard to 06:07.450 --> 06:09.400 visualize it as a quad. 06:09.430 --> 06:16.540 So if I actually grab fats you can see the way it flows naturally if I make these more quads like unarm 06:16.540 --> 06:18.550 deforming the surface at the moment. 06:18.550 --> 06:22.000 But I like it make them more Quand like we can see is flowing around there. 06:22.060 --> 06:28.060 So that would mean I made the cut in the wrong place on that triangle for it to fly around. 06:28.090 --> 06:34.930 So if I undo those steps I now have just moved a lot of things about so we've got this extra cut here 06:34.930 --> 06:38.080 that we made well perhaps that's not where we want to serve. 06:38.110 --> 06:44.520 I grab the knife tool go down there and apply that one well we wanted it to flow around here. 06:44.740 --> 06:47.820 This is the edge that must continue. 06:47.820 --> 06:49.930 This one here to this one here. 06:50.170 --> 06:54.030 So does that mean we have to put cuts in this hedge to continue. 06:54.030 --> 06:58.930 And again I'm going to make a couple of triangles here but in purposes of demonstrating that see how 06:58.930 --> 06:59.590 that works. 06:59.710 --> 07:08.680 Yes it does so again because this doesn't really look like a triangle anymore it's difficult to visualize. 07:08.680 --> 07:17.270 But if we make it look like a quad rather than that triangle we can see the flow is much more apparent. 07:17.380 --> 07:22.270 And that can be a difficult and challenging thing when you first start trying to make edges flow where 07:22.270 --> 07:25.180 you want them to flow but that's a nice tool. 07:25.180 --> 07:27.640 In essence it's a very powerful tool. 07:27.760 --> 07:33.800 But with that power comes a bit of responsibility but you go don't go ahead and wreck your model. 07:33.850 --> 07:39.100 One of the things I do see people doing a lot is they end up cutting through parts of the model they 07:39.100 --> 07:40.370 didn't intend to. 07:40.390 --> 07:46.630 So what I would advise in general special is your beginning not holding down the mouse button and cutting 07:46.630 --> 07:51.940 through lots of places because that's how mistakes are easily made are going to right click to cancel 07:51.940 --> 07:58.270 that I'm going to press the caky again and go click find the next point that I want to cut through and 07:58.420 --> 08:04.180 click with the left mouse button click with the left mouse button click with the left mouse button and 08:04.180 --> 08:04.990 so forth. 08:05.110 --> 08:11.590 And that way you can be sure that what you're actually cutting is only when you're clicking and I'm 08:11.740 --> 08:18.670 going to apply that and then immediately check for the Edge loop or the face loop that I'm intending 08:18.670 --> 08:23.530 to create is still actually working that is very important. 08:24.610 --> 08:26.920 Okay guys it's Challenge time. 08:26.920 --> 08:35.860 I'd like you to create your eye loops so use the knife tool to cut into your model creating new geometry. 08:35.860 --> 08:41.580 Now I would also hint here using bevelling virtex and might be a great start. 08:41.590 --> 08:45.330 Not necessary you can use the knife tool throughout. 08:45.340 --> 08:52.510 Now keep in mind edge flows and face loops they'll help you check out which ones you've broken which 08:52.510 --> 08:58.820 ones you need to redefine as you go and your creating the loops for the eyes. 08:58.960 --> 09:05.540 Remember starting to define features were not working at a detail level at the moment. 09:05.630 --> 09:11.380 We're literally saying this is where the eye is going to go and from there we can start modelling detail 09:11.440 --> 09:12.830 later on. 09:13.100 --> 09:19.060 I do remember of course that this may take a couple of attempts so make sure you've saved your work 09:19.090 --> 09:22.010 as a separate file so you can reopen that. 09:22.030 --> 09:24.810 If it's not it hasn't gone to plan. 09:25.030 --> 09:27.000 Okay good luck with it. 09:27.010 --> 09:29.910 Pause of the air now and give that a go. 09:31.820 --> 09:32.530 Okay guys. 09:32.540 --> 09:33.740 Welcome back. 09:33.740 --> 09:37.930 Let's go create our loops and hop on over in a blender. 09:38.210 --> 09:40.910 Okay so welcome back over into blender. 09:40.910 --> 09:44.660 The first thing I'm going to do here is hop straight on in to edit mode. 09:44.660 --> 09:46.680 I can see the underlying mesh. 09:46.760 --> 09:52.230 I'm going to turn off my grease pencil for the moment and I can always turn it back on. 09:52.260 --> 10:00.680 If I find it important or necessary at the point and I'm also going to turn off the display of the modifier 10:00.680 --> 10:04.250 the subsurface modifier whilst I'm in edit mode. 10:04.310 --> 10:07.560 The reason for that is so I can see where all the vertices are. 10:07.820 --> 10:09.970 As you can see we look directly at the eye. 10:09.980 --> 10:15.110 Two of them are completely hidden at the moment and I don't want that for my own sanity. 10:15.290 --> 10:20.160 So a couple of things that I need to do here to help me define the eye itself. 10:20.300 --> 10:28.310 I'm going to have to put in an extra loop cut running down here to define the outer part of the eye. 10:28.550 --> 10:30.030 Okay that's done. 10:30.170 --> 10:35.470 There's a couple of options here with the I on what we do in how we do it. 10:35.650 --> 10:38.280 I it's going to straighten these bits up here. 10:38.780 --> 10:44.780 Got proportional editing turned on that can cause some headaches occasionally. 10:44.780 --> 10:51.650 Now I could start cutting out our shape as we need it here starting off with a dime and I'm going to 10:51.650 --> 10:54.250 use a little bit of a short cry here. 10:54.310 --> 10:59.270 Don't worry if you didn't use the bevelling virtex talk give you a bit of hidden in there because we 10:59.270 --> 11:02.830 haven't used it in anything so far in this course. 11:02.840 --> 11:06.010 We've demonstrated it but not actually used it in anger. 11:06.200 --> 11:13.650 So for instance this vertex in the middle here bevelling virtex if you cast your mind back it was control. 11:13.670 --> 11:15.300 Shift them b. 11:15.380 --> 11:18.590 Once we've done that we can generate a dime shape. 11:18.650 --> 11:26.150 Once that's finished we can move it about and create are necessarily the necessary diamond shape that 11:26.150 --> 11:28.310 we need for the eye itself. 11:28.310 --> 11:32.900 Now one thing about bevelling vertex of course just remember the segments and is going to bevel another 11:32.900 --> 11:33.390 one here. 11:33.390 --> 11:34.440 Not going to keep it. 11:34.850 --> 11:39.950 But if you've got the mouse wheel and you've scrolled it or you've had a higher level of segments was 11:39.950 --> 11:41.260 playing with it before. 11:41.360 --> 11:43.620 It may be still set a high level. 11:43.640 --> 11:48.100 I have opted to Sister level one that which gives me a bit more control. 11:48.260 --> 11:55.140 And again will be focussing on macro detail at the moment rather than micro detail. 11:55.550 --> 12:02.120 Okay so now we've done that let's check the status of our loops so absoute doubts are going to hold 12:02.120 --> 12:03.850 down oltz and face loops. 12:03.860 --> 12:07.420 Those are intact that's broken. 12:07.640 --> 12:09.160 Those are intact. 12:09.200 --> 12:11.110 Let's check vertical ones. 12:11.510 --> 12:12.540 Okay. 12:13.740 --> 12:19.070 Okay so I've broken some of my loops and what's going on here. 12:19.230 --> 12:23.400 Well let's chase this horizontal one here around our models for a start. 12:23.400 --> 12:24.050 Here we go. 12:24.050 --> 12:27.870 Here we go here and then we get to a pole. 12:28.170 --> 12:32.520 We've got one of two directions in which we can continue blender doesn't know which one we're going 12:32.520 --> 12:34.110 to do so it's stuck. 12:34.120 --> 12:39.600 It can't do anything and what we can do very quickly here in fact I'm just looking at the geometry and 12:39.600 --> 12:41.260 trying to work it out. 12:41.310 --> 12:52.820 We can hit the knife key and literally cut out a couple of trapezium shaped objects or faces and then 12:52.830 --> 12:54.720 press space there. 12:54.750 --> 12:56.040 How has that work. 12:56.040 --> 12:57.810 Let's test horizontally. 12:57.810 --> 12:59.640 Yep we're flowing around me. 12:59.660 --> 13:02.430 I perfect vertically. 13:02.490 --> 13:03.070 Okay. 13:03.330 --> 13:10.920 Now what is happening here is what basically is one phase one continuous face loop that crosses over 13:10.920 --> 13:11.720 in the middle. 13:11.790 --> 13:17.010 So what is happening here if we start on the left hand side with this face it goes down goes to here 13:17.220 --> 13:24.180 it crosses over the eye coast back to here and then follows on down it loops all the way round the back 13:24.180 --> 13:31.830 of our model comes back down here and then crosses over again and goes back down until it reaches here 13:31.830 --> 13:34.490 again and goes in a full circle again. 13:34.740 --> 13:37.830 So occasionally you will get your model doing this. 13:37.830 --> 13:44.610 If you've managed to make a crossover point it's almost like a cross roads for these face loops and 13:44.610 --> 13:46.470 they just join back up again. 13:46.470 --> 13:51.210 The other thing to check of course is where it's going because it's not going round the bottom because 13:51.240 --> 13:54.360 there is no bottom at the moment we can see if we look here. 13:54.400 --> 14:01.100 He is following this loop around here around the back of a head back up all the way to the front again 14:01.340 --> 14:03.930 but we are starting now to define the eyes. 14:03.930 --> 14:10.710 In fact if we hop out into object mode we can see that the eyes themselves are starting to be defined 14:10.940 --> 14:13.710 and that will help us define the brow as well. 14:13.710 --> 14:20.640 So one one further thing we can do here is starting to put some more detail here to define the brow 14:20.700 --> 14:21.840 itself. 14:21.850 --> 14:26.580 I know we're not focussed purely on detail here but I just want to make sure that the overall shape 14:26.880 --> 14:28.080 is right. 14:28.140 --> 14:35.090 Of course if we go tramper face looping here we start to get some quite funky stuff going on. 14:35.100 --> 14:37.180 I'm not going to do that for the moment. 14:37.320 --> 14:43.170 I'm going to probably end up deleting In fact let's do it now let's get rid of that face and delete 14:43.440 --> 14:44.810 faces. 14:45.030 --> 14:49.450 Okay so that gives us a hole in our mesh which is fine. 14:50.310 --> 14:51.800 Let's move round to the front. 14:51.930 --> 14:55.480 We can see that it gives us a rough free the right shaped hole. 14:55.590 --> 15:02.250 It also enables us to start moving things about because what we don't have at the moment is any real 15:02.250 --> 15:04.700 control over the shape of that heart. 15:04.860 --> 15:11.370 So again let's switch it back on at this point and grab that with proportional editing turned on and 15:11.370 --> 15:18.550 just modify the shape ever so slightly to help us define the I itself. 15:18.690 --> 15:22.500 Again there's no right or wrong when it comes to this sort of thing. 15:22.710 --> 15:25.280 Cavour is starting to look good. 15:25.390 --> 15:29.820 They're going to have to be some extra geometry coming in here in fact. 15:29.820 --> 15:33.240 Now we've not got any damage to the air. 15:33.240 --> 15:36.070 We can do that one and we can do this one. 15:36.240 --> 15:44.230 And that should give us the ability to let's say grab this and just make the I just a little bit better. 15:45.690 --> 15:52.290 Our from restore that face at any point if I want to add further detail in the eye if I might have to 15:52.290 --> 15:54.650 do that now I've deleted it. 15:54.660 --> 15:59.160 No that's no biggie because we've got edge loops and if we've got edge loops it means we can select 15:59.220 --> 16:03.270 our model with much more ease than if we don't have them. 16:03.270 --> 16:07.130 So we've got this one here that does look a tiny bit odd. 16:07.140 --> 16:09.960 Let's just have a look at that again in object mode. 16:10.230 --> 16:12.780 That is starting to look very very good. 16:12.780 --> 16:18.830 The eyes have a good shape and not that much detail at the moment which is the level we want. 16:18.840 --> 16:24.780 I am going to fill that hole back in again because when it comes to detailing the inside of the inside 16:24.810 --> 16:31.590 of VII it's going to be much easier to insets and you can inset a face that doesn't exist somewhere 16:31.650 --> 16:38.190 of the Selecta that edge loops running around there and fill that in and that will enable us to insets 16:38.190 --> 16:44.750 hits in the future to make more detail look feel that back in perfect. 16:44.760 --> 16:48.570 How did you guys get on have you defined your eyes in your model. 16:48.670 --> 16:49.860 How is it coming along. 16:49.860 --> 16:56.150 I'd love to see it remember to show your work in discussions and I will see you in the next lecture.