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Drawing B-splines

From: mocha 2.6 Essential Training

Video: Drawing B-splines

While there are religious differences on the subject of which type of Spline is best, I feel the X-Spline is best suited for mechanical objects with simple shapes like this laptop. For complex shapes like people and animals I prefer the B-Spline. So to take a look at that let's go get another clip. So we can click on the New Project folder. Be sure to click on Save so that this project will be saved for next time and now we can browse to our new location, go to our Exercise Files>Lesson_01_Media, and select Lantern Boy, and again just click on the first frame and then click Open.

Drawing B-splines

While there are religious differences on the subject of which type of Spline is best, I feel the X-Spline is best suited for mechanical objects with simple shapes like this laptop. For complex shapes like people and animals I prefer the B-Spline. So to take a look at that let's go get another clip. So we can click on the New Project folder. Be sure to click on Save so that this project will be saved for next time and now we can browse to our new location, go to our Exercise Files>Lesson_01_Media, and select Lantern Boy, and again just click on the first frame and then click Open.

Just click on OK on the New Project and we have our clip and we can play the clip and we have this little walk cycle. This is actually cropped from a 2k film scan and, as you can see, because the boy is walking, he's got a lot of motion blur. So make sure that your playhead is on frame one and we'll start doing a B-Spline around his arm. So using the Z key let's zoom-in real tight. Use the X key to pan over, click on the B-Spline tool, click-and-drag, click-and-drag, click-and-drag, click-and- drag. This is like the Photoshop Pen tool.

Same concept: click-and-drag, click- and-drag, point, another point, point, point, point, point, point, point, and right-mouse to close. Now you can draw a rectangle to select all the control points in your spline and then with the cursor on the control point you see how the cursor changes shape to let you know you're on the control point, right-mouse pop-up and look at the Point menu. We can turn them all into a Corner. So what you get is a sharp straight lines with no control points.

Select them again, turn them into Linear which is straight line segments between all the control points, but you now have handles. So if you want to adjust them, you can. Or, select all the points, right-mouse pop-up to Smooth. Smooth sets all of the slopes; you get a nice continuous smooth outline, which is usually a good place to start. Now we'll go in and refine them. When you have points selected like this if you just click off to the side they'll deselect.

Right now the Spline is selected. So if I click off to the side again, the Spline is deselected. There's two ways I can reselect it. I can click somewhere on this Spline line itself or click over here to deselect. Come over here to the Layer Controls and just click on the name of the Spline. Now if you accidentally deselect something you'll know how to put it back. So let's take a look at adjusting the points, their slopes, and their tensions. First of all, let's zoom-in here. I need a nice sharp break right here on this corner.

So hold down the Command key and that will give you a corner break. You can adjust the slope. Over here another corner. So hold down the Command key, adjust that, or Ctrl again if you're on a Windows machine. Let's pan over here. We can adjust the tension on any one of the control points. Adjust the control point itself, adjust the tension, come around here, and adjust these guys up, as well, of course, as the slope. So let's say we like that, and again we have a lot of motion blur.

So I'm drawing my Spline on the inside, the hard part of the shape, but again we'll be looking at these issues when we do our Advanced Rotoscoping class. Now there is visibility controls for the control points, the handles, and the spline. Up here, if you click on this, you can turn off all the control handles. Now you can adjust the spline without the control handles being in your face. This is sometimes a very nice way to set things up and kind of tweak things in. That's a nice presentation.

You can turn them back on by selecting that again. You can also turn off the entire spline with this right here. Now the whole spline is gone. So we'll put that back. Now, over here in the Layer Control for each spline, this is your Visibility button. It turns the visibility of the spline on or off. This doesn't enable and disable the spline over the length of the timeline. This is just a visibility thing in case you want to get it out of your way to work on another shape. We'll come back to this cog a little later.

This column is the Lock and Unlock. Notice when I lock it all the control points have disappeared. That's your clue that a spline is locked. We'll go over here and unlock that. And, of course, we can change the name by double- clicking on the current name and rename it arm. Now I'm going to home the viewer with the Asterisk (*) and deselect the spline. Next up is to see how to add keyframes to our splines to animate them so they'll stay on a moving target.

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This video is part of

Image for mocha 2.6 Essential Training
mocha 2.6 Essential Training

49 video lessons · 7736 viewers

Steve Wright
Author

 
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  1. 5m 23s
    1. Welcome
      1m 40s
    2. Getting to know the user interface
      3m 43s
  2. 1h 7m
    1. Drawing X-splines
      8m 2s
    2. Drawing B-splines
      5m 4s
    3. Editing splines
      3m 52s
    4. Keyframing splines
      6m 33s
    5. Discovering the timeline controls
      5m 52s
    6. Walking through the New Project window
      4m 23s
    7. Working with interlaced clips
      8m 19s
    8. Setting the color space
      4m 46s
    9. Defining mocha preferences
      3m 46s
    10. Walking through the Layer Control panel
      3m 22s
    11. Walking through the Layer Properties panel
      3m 29s
    12. Viewing mattes
      3m 41s
    13. Walking through the Edge Properties panel
      6m 24s
  3. 1h 8m
    1. A planar tracking demo
      6m 36s
    2. Setting motion options
      13m 12s
    3. Adjusting the tracking spline
      8m 51s
    4. Tracking awkward surfaces
      6m 3s
    5. Understanding the planar grid
      6m 50s
    6. Dealing with lens distortion
      7m 43s
    7. An AdjustTrack demo
      5m 49s
    8. Keyframing the AdjustTrack
      7m 48s
    9. Offsetting reference points
      5m 49s
  4. 1h 8m
    1. Strategizing shape distribution
      11m 21s
    2. Working with large areas
      2m 44s
    3. Selecting a start frame
      10m 38s
    4. Replacing a shape
      2m 54s
    5. Keyframing: Bifurcation
      4m 38s
    6. Keyframing: Straight ahead
      5m 17s
    7. Keyframing: Extremes
      9m 22s
    8. Keyframing: Maximum digression
      6m 45s
    9. Converting to stereo
      2m 54s
    10. Inspecting your rotos
      4m 43s
    11. Rendering mattes
      4m 45s
    12. Exporting shapes
      2m 54s
  5. 1h 30m
    1. Moving the camera with parallax
      5m 30s
    2. Moving the camera without parallax
      3m 58s
    3. Using multiple splines in a layer
      7m 23s
    4. Subtracting shapes
      7m 6s
    5. Stabilizing the viewer
      5m 46s
    6. Keyframing during tracking
      7m 24s
    7. Unlinking the tracker
      5m 8s
    8. Tracking manually
      12m 35s
    9. Defining corner pinning
      5m 4s
    10. Going further into the Track tab
      6m 53s
    11. Utilizing the more advanced AdjustTrack features
      8m 40s
    12. Working with the Stabilize tab
      6m 11s
    13. Exporting track data
      8m 53s

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