About
The file format is JSON based and consists of a top-level object that has a surfaces member, containing an array of surfaces objects. Files containing this format are marked with the extension .babl (for Barco Advanced BLend).
F.1 Advanced blend, file creation
File parameters
| Invert | Renders the file with inverted colors when true |
| Surfaces | ||
| Type | A string describing the type of surface | |
| Coons | 12 control points. A Coons Patch is described via 4 bezier curves, sharing the 4 corner points. These will be described as C1 to C4 , in this order: top-left, top-right, bottom-left, bottom-right. Each corner also has two handles, which describe the way each curve exits the corner point, these will be described as C1H1 to C4H2 where H1 is the horizontal handle, and H2 is the vertical handle. The order of the points in the points array is then as follows: C1, C1H1, C2H1, C2, C1H2, C2H2, C3H2, C4H2, C3, C3H1, C4H1, C4. | |
| Cubic | 16 control points Bicubic Bezier surface | |
| Points | An array of normalized 2D points (float,float). | |
| Colors | An array of exactly four normalized RGB values (float, float, float). These describe the color values used for each corner point, and are arranged in the same order as the corner points | |
| Type | Must contain the text value "babl" in order to declare this a drawing of the advanced blend type |
| Version | Must be set to the text value "1.0" |
"presentation": { "stroke":1, "points":true, "bubbles":true } | Used by the UI tool when files are created and/or edited in this tool, and will be present in a file downloaded from the projector These parameters are not needed when creating a file |