TYPE: COP
TITLE: VEX Generator COP

This COP runs a VEX script on the planes it generates. The vex script should
not read from R,G,B,A, Cr,Cg,Cb or C4. The vex script should write to Cr, Cg,
Cb and C4 (components 1 to 4 of each vector).

Middle click on the dialog '?' help for more generator help.
Right click on the dialog '?' help for more help on VEX operations. 

Parameters:
VEX Generate
    VEX Function         - The VEX script to run, with any parameter 
			   arguments you wish to override.
    Reload VEX Functions - Reloads the VEX script. Useful if the script
			   has been modified and re-compiled.

Image & Sequence 
    Overview - See extra help (Middle click on the dialog '?' help).

Local Variables:
    L   - Sequence length
    S   - Start of sequence
    E   - End of sequence
    IL  - Input sequence length
    SR  - Sequence frame rate
    NP  - Number of planes in sequence
    W,H - Width and height of image
    I   - Image index (0 at start frame)
    IT  - Image time (0 at start frame)
    AI  - Current plane array index
    PI  - Current plane index
    PC  - Num of channels in current plane
