| 1644 |  |  | 
| 1645 |  | Added -c option to rtcontrib to facilitate cumulative calculations. | 
| 1646 |  |  | 
| 1647 | – | Added ability to incorporate LBNL Window 6 bidirectional scattering | 
| 1648 | – | distribution function (BSDF) data in mkillum. | 
| 1649 | – |  | 
| 1647 |  | ****** COMPATIBILITY CHANGE ******** | 
| 1648 |  | Fixed long-standing bug in source.cal, which caused it to produce | 
| 1649 |  | reversed anisotropic photometric distributions due to the | 
| 1660 |  |  | 
| 1661 |  | Added "planisphere" (stereographic) fisheye view type for traditional | 
| 1662 |  | daylighting analysis.  Feature requested & explained by Axel Jacobs. | 
| 1663 | + |  | 
| 1664 | + | Modified -c option to rtcontrib so it can take a number of input | 
| 1665 | + | rays to average over, rather than only produce a single accumulated | 
| 1666 | + | record (which can now be done with -c 0). | 
| 1667 | + |  | 
| 1668 | + | ===================== | 
| 1669 | + | Version 4.0 | 
| 1670 | + |  | 
| 1671 | + | Added -n option to rvu to provide parallel rendering. | 
| 1672 | + |  | 
| 1673 | + | ****** COMPATIBILITY CHANGE ******** | 
| 1674 | + | Changed ".pic" extension to ".hdr" in all sources and documentation | 
| 1675 | + | to improve interoperability with other software, since this has become | 
| 1676 | + | the de facto extension for Radiance RGBE and XYZE pictures.  Since file | 
| 1677 | + | extensions were never more than a convention in Radiance, this does not | 
| 1678 | + | affect operation, but may require the update of scripts, etc. written | 
| 1679 | + | by others that assume the ".pic" suffix for Radiance output. | 
| 1680 | + |  | 
| 1681 | + | Added -N option to objview to support multiprocessing. | 
| 1682 | + |  | 
| 1683 | + | Improved sampling of circular sources (source, sphere, ring types) with | 
| 1684 | + | quite a bit of help from David Geisler-Moroder. |