   [DirectX 10.1] How can I use shader model 4.1?
  I'm trying to use the shader shader 4.1 but when I compile my code I get this error: Shader model vs_4_1 is not allowed in D3D10 techniquesBut ps_4_1 doesnt give any problems so I dont understand what is the problem, because if ps_4_1 is supported vs_4_1 should be supported aswell   
  Can you give us some more details?Do you try to compile shaders or effects? Do you use the command line tool or the API?In the case you use the command line tool can you post the parameters you use?If you use the API what functions and SDK Version do you use?;  i think you try to compile 4_1 shader on dx10 device, instead u need to create dx10.1 device   ;  Thats because my graphics card only supports directx 10.0 feature level   ;  in this case, you either have to buy new gpu(dx10.1 capable) or use WARP or REFor convert your shader so it will support 4_0   