Rendering

Select Rendering > Render from the menu or Render Scene from the toolbar.

Interlaced sequence

If the original sequence is interlaced and you want to keep the same fluidity of movement, you have to render in interlaced mode. To do this, check the Render to Fields box.

When you do this you must keep the exact original image size so that each synthesized frame superimposes exactly on the original sequence.

To keep the frame order the same as that used in MatchMover, it may be necessary to modify

the frame order in 3ds max.

1. Select File > Preferences from the main menu and open the Rendering page.
2. Select the correct order in the Field Order radio buttons.

Compositing in 3ds max

It is possible to do the compositing directly in 3ds max in order to merge live action with a computer-generated model.

If you wish, you can delete the image plane and use the sequence as a background image.

The following procedure represents the simplest way to define a background image concerning the pixel aspect matching. When this is done correctly, the background image should exactly match the 3D.

1. Select Rendering > Environment.

   

2. Define an Environment Map of the type Bitmap.
3. While keeping the Environment window open, open the Material Editor from the toolbar.

   

4. Drag and drop the Map #1 (Bitmap) to a channel of the material editor using the Instance method.
5. In the Material Editor, choose the image to use as the background.
6. Set Bitmap > Parameters > Filtering to none.
7. Set Coordinates > Mapping to Screen.
8. Select Views > Background Image and check the Use Environment Background box.

   

If the matching between the background image and the 3D is not “clean”, there are two possible reasons.

• The start of the sequence does not correspond to the start of the camera trajectory. In Material Editor > Time, change the Start Frame field for the environment map.
• The background image is interlaced but when 3ds max does a filtering, you have the impression of a mismatch in the camera view. However the render is okay. You can solve this display problem by creating a non-interlaced sequence and by using it as the background image while keeping the interlaced environment map.

Other problems

Sometimes, when your sequence contains very far points, the 3ds max camera can have problems calculating the clipping planes (the objects situated in front of the camera are not visible in the camera view). If this is the case, you must use the manual clipping mode and define the near and far parameters of the clipping.