2D motion vectors from 3D model data

1. A method of converting spatial three dimensional model data into two dimensional image data, comprising:

receiving the spatial three dimensional model data at a display system having a graphics processing unit and a display processor, wherein the display processor has a capability to hold one or two frames of spatial two dimensional image data and utilize motion vectors to reconstruct at least a part of a frame of spatial two dimensional image data;

identifying at least two vertices of an object to be rendered in a frame of the spatial three dimensional model data;

calculating a three-dimensional (3D) motion vector for each vertex of the object to be rendered between a first frame and a second frame of the spatial three-dimensional model data;

determining a position of each vertex in a new frame;

calculating the motion vectors for a block based upon each vertex position in the new frame and the motion vectors for the vertex, wherein a block is one of a set of rectangular blocks into which image data in the new frame is divided;

determining a motion vector for a center of a block of pixels, wherein the determining is based on the motion vector for the vertex located in the block, a location of the center of the block of pixels relative to the vertex, and at least one other motion vector for another vertex; and

using the motion vector for the center of the block to render pixels in the new frame onto a screen.

2. The method of claim 1 , further comprising selecting which motion vectors will be used for the block.

3. The method of claim 2 , wherein selecting which motion vectors comprises using depth information to select the motion vectors.

4. The method of claim 3 , wherein selecting the motion vector comprising selecting a foreground motion vector.

5. The method of claim 1 , wherein using the motion vectors to render the pixels comprises interpolating between two frames of previously rendered video frames.

6. The method of claim 5 , wherein interpolating between two frames of previously rendered video frames comprises:

rendering the two frames of previously rendered video frames using the graphics processor; and

rendering the pixels in the interpolated frame using the display processor.

7. The method of claim 1 , wherein using the motion vectors to render the pixels comprises extrapolating a frame of video data from a previously rendered video frame.

8. The method of claim 7 , wherein extrapolating the frame of video data comprising:

extrapolating the frame of video data using the display processor; and

filling in any missing information using the graphics processor.

9. The method of claim 8 , wherein filling in any missing information comprises using a stencil buffer to identify which information is missing.

10. The method of claim 8 , wherein the missing information comprises at least one of uncover regions, lighting effects, shadows and alpha blending.

11. The method of claim 1 , further comprising calculating a 2D position of the vertices prior to calculating the 3D vertices.