Soet i know what soft particles are
. And you can see there are no lines in my pictures when the smoke "touches" the objects. Soft particles are supported in DX9 and even COD2 had them too. Seriously, it is not a DX10-11 feature
"Thanks to the new Call of Duty 2 engine, the title makes extensive use of advanced vertex and pixel shader technology to create stunning special effects such as soft shadows, heat distortion, and soft particles to achieve amazing realism," said Bill Rehbock, director of developer relations at NVIDIA.