Differential D1940 Diff 6488 manual/compositing/types/distort/plane_track_deform.rst

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manual/compositing/types/distort/plane_track_deform.rst

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	Plane Track Deform Node.	Plane Track Deform Node.

	TODO - see: https://developer.blender.org/T43469	Used to incorporate the special "plane track" in your composite by checking areas
		which are planes, and replacing their footage with some other image.

		Plane Track
		===========

		Before using this node, plane track for the footage should be made in the Movie Clip Editor.
		For more info, :doc:`see plane track </section/path/to/file>`.

		Node Settings
		=============

		Drop down menu
		Used to select the movie clip whose plane track to use.
		Object
		Used to select the object to which the plane track is linked.
		Track
		Used to select the plane track to use.
		Image input
		Image to put in place of the plane track, and thus, override that area in the movie clip.
		Motion Blur
		Specify whether to use blur caused by motion of the plane track or not.

		Samples
		Set the number of samples to take for each frame.
		The higher the samples, the smoother the blur effect,
		but the longer the render, as each virtual intermediate frame has to be rendered.
		Shutter
		Time (in frames) the shutter is open.
		If you are rendering at 24 fps, and the Shutter is set to 0.5,
		the time in between frames is 41.67 ms, so the
		shutter is open for half that, 20.83 ms.

		.. note::

		Samples are taken only from the next frame, not the previous one.
		Therefore the blurred object will appear to be slightly ahead of how it would look without motion blur.

		Image output
		The output by wrapping the image to that plane track.
		Plane output
		Produces a bw mask of the plane track.

		Examples
		========

		Using Image output
		------------------

		This can simply be achieved by using the alpha over node.

		.. figure:: /images/compositing_nodes_distort_planetrackdeform_example_image_output.png

		Image output

		Using Plane output
		------------------

		This can be achieved by mixing the movie clip and the image using the plane output as the factor.

		.. figure:: /images/compositing_nodes_distort_planetrackdeform_example_plane_output.png

		Plane output

		Using Image output vs using original image
		==========================================

		Using Image output scales, translates and skews the input image according to the track
		while using the original image and mixing it with the movie clip using Plane output as factor
		will display the part of the image that lies inside that mask. This image shows the difference

		.. figure:: /images/compositing_nodes_distort_planetrackdeform_output_comparison.png

		Comaprison between image output and original image (see viewer nodes carefully)
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