- pix-warp-stereoprocedure
- in - PPIX
- in - ZBEND: int - horz sep (in px) red/cyan left/right sides
- in - ZSHIFTT: int
- Push top of image plane away (>0) or towards (<0) viewer
- in - ZSHIFTB: int - push bottom of image away or towards viewer
- in - YBENDT: int -
- Param for displacement right/left edge, y= ybendt*(2x/w-1)^2
- in - RLEFT: int - 1 to put red filter on left, 0 otherwise
- returns: modified ppix or #f on error.