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Basic, Command, Types

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Last Update: Thu Jul 06 16:26:18 2000

Basic Command Types

Basic

Transform completes one or two image or 3D mesh composition in progress. MCL transform can composite a video frame with a still image or a 3D mesh and generates cinematic effects.

Command

Command	_transform argument
Argument	name=transform's name; default Wipe order=inputs order; default normal with order (snap video) duration=seconds of processing; default 20.0 progstart=progress starting value in [0.0, 1.0]; default 0.0 progend=progress end value in [0.0, 1.0]; default 1.0 progcur=progress current value in [0.0, 1.0]; default 0.0
Descriptiotn	The attribute name specifies the transform name. order attribute specifies the order of inputs. It has the possible value normal or exchange. The value normal indicates that the first input is from a snap and the second input is from the current video frame. duration attribute is the processing duration of the transform. Its unit is the second. progstart attribute specifies the start value of the progress of the transform; progend, attribute specifies the end value of the progress of the transform; progcur attribute specifies the current start value of the progress. All of them have the value in the range from 0.0 to 1.0.
Examples	_transform {name=Wipe order=exchange duration=20 progstart=0.5 progend=1.0}

Types

It is possible to design and use many transforms. MCL uses the transforms that are generated with Microsoft DirectX Transform. In the following paragraphs, we will introduce some typical transform
- Wipe
  
  Wipe transform sweps image B over the image A from left to right. There are three rectangle regions: image B only on the left, gradient region on the middle, and image A only on the right. The gradient region is the rectangle mixing between image A and B. The boundary between image A region and the gradient region is called the leading edge. Similary, the boundary between the image B region and the gradient region is called the trailing edge.
  
  Its progress value is from 0.0 to 1.0, indicating how much of the transition has been completed. The custome attribute of the wipe transform grandient specifies what percentage of the toal image width to use. It has the value from 0 to 100.
- Fade
  
  It makes an image progressively fade or disappear. For example, an image may be fade into a white.
- MetaCreations Transform
  
  These transforms are used to generate cinematic effects. Following are snapshots that are generated by Ladybug 2000. They are image transforms. Refer to "samples\transform\transform list.mcl" for script details.
- 3D Transform
  
  It is the transform of a 3D mesh with the video.
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