Updates to Portal and Half-Life 2: Episode 2 have been released. The updates will be applied automatically when your Steam client is restarted. The specific changes include:
Portal and Half-Life 2: Episode 2- Added a new advanced video option that allows the user to easily change the field of view to any value they wish between 75 degrees and 90 degrees
- Updated the particle rendering code and particle data files to make them compatible with the particle editor included in the Source SDK
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Source: Steam