Half-Life 2: Lost Coast is a playable technology showcase that introduces High Dynamic Range lighting to the Source engine. It is included with Half-Life 2, purchased on Steam. Originally planned as a section of the Highway 17 chapter of Half-Life 2, Lost Coast follows Half-Life protagonist Gordon Freeman as he travels up a coastal cliff to destroy a Combine artillery launcher in a monastery, which is firing on a nearby town.
Half-Life 2: Lost Coast
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I wish it was the same image side-by-side, one with and without HDR. It'd showcase the differences a whole lot better.
The right is more trying to show their bloom tech then it's trying to show HDR. They rewrote most of the rendering code for the Source Engine to render in HDR but then down convert it into LDR and anything that is reflected or lit too that high for the display (probably higher then a value of 255) gets bloom. The left is just trying to show the Engine before the rendering implementations.