3D Compositing with Action > Action: 3D Geometry > Working with 3D Geometry > 
Subdividing a Model
 
 
 

The Subdivide feature is useful for creating precise highlights and spotlights. The polygons in the 3D model are subdivided at the time of render according to the value you specify, resulting in smoother rendered surfaces.

Show small imageShow large image

Spotlight on a polygon model rendered with Subdivide off.

Show small imageShow large image

Spotlight on a polygon model rendered with Subdivide set to 2.

To subdivide a model:

  1. Select the model or geometry you want to subdivide.
  2. In the Geometry menu, click Subdivide to enable the Subdivide field.
  3. Edit the Subdivide value. The default value is 5.
    NoteThe smaller the value, the slower the rendering.
  4. Click Process or Preview to see the subdivision effect.

You can animate the Subdivide channel in the Channel Editor; however, expect a longer rendering time when the Subdivide value changes over several keyframes.

Setting Surface Resolution

When you use Action, you work with geometry surface resolution. Surface resolution is set using the Resolution field and Linetest button in the Rendering Settings section of the Action Setup menu. You can vary the resolution according to the animation you add to the clip and use Linetest to check it. If you use texture, full resolution texture is used while you work. The image in the image window is displayed at full resolution when you preview or process the clip. You can also set a render resolution from the Action Setup Resolution Settings menu. See Resolution Settings.

Show small imageShow large image

(a) Resolution field  (b) Linetest button  

To generate a clip at a lower resolution:

  1. In the Rendering section of Action Setup menu, disable Texture.

    Surface media mapping occurs according to the value in the Resolution field.

  2. In the Resolution field, enter a value.

    You may want to increase the quality by entering a small value, particularly if you are using lighting, shading, or displacement.

    NoteTo see what happens as you experiment with the Resolution value, add a bicubic surface to the scene and enable Wireframe. Notice the number of surface polygons as you increase and decrease the Resolution value.
  3. Enable Linetest.
  4. Click Process to render the animation.

    The animation is rendered at the resolution that you entered in the Resolution field.

    NoteMotion blur and anti-aliasing are ignored, but global rendering—either Fields or Frames— is used.